TS_305_Electrical_and_Electronic_Designating_and_Marking.pdf

U.S. Coast Guard Naval Engineering

Technical Standard

Title

Prepared by:

Author Date

Reviewed by:

Chief, Engineering Services Division Date

Surface Forces Logistics Center

Approved by:

Chief

Office of Naval Engineering (CG-45)

Date

Distribution Statement D: Distribution Authorized to the DHS/ USCG/DOD and their contractors to protect publications required for official use or for administrative or operational purposes only, determined on 9 DEC 2010. Other requests shall be referred to: Commander

SFLC-ESD-TIMB 2401 Hawkins Point Rd M/S 25 Baltimore MD, 21226

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Published by Commander, Surface Forces Logistics Center

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SFLC TECHNICAL STANDARD 305

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ELECTRICAL AND ELECTRONIC DESIGNATING AND MARKING

1. SCOPE

1.1 Intent. This technical standard provides requirements and guidance for the proper designation and marking of electrical and electronic cables and equipment installed on Coast Guard cutters and boats.

1.2 Appendices.

SUB-STANDARD APPENDIX

INTERIOR COMMUNICATIONS SYSTEMS

DESIGNATION

A

PLATES, TAGS, AND BANDS FOR IDENTIFICATION

OF EQUIPMENT

B

ELECTRONIC SYSTEMS DESIGNATION C

2. REFERENCES

COAST GUARD DRAWINGS

None

COAST GUARD PUBLICATIONS

SFLC Technical Standard SWBS 320 (Under Development)

OTHER REFERENCES

American Society of Mechanical Engineers (ASME), Y14.38M, Abbreviations and Acronyms for Use on Drawings and Related Documents.

American Society for Testing and Materials (ASTM), B36, Standard Specification for Brass Plate, Sheet, Strip, And Rolled Bar.

American Society for Testing and Materials (ASTM), B209, Aluminum and Aluminum-Alloy Sheet and Plate.

American Society for Testing and Materials (ASTM), D709, Standard Specification for Laminated Thermosetting Materials.

American Society for Testing and Materials (ASTM), F1166, Standard Practice for Human Engineering Design for Marine Systems, Equipment, and Facilities.

MIL-STD-2003 (Series), Electric Plant Installation Standard Methods for Surface Ships & Submarines.

Institute of Electrical and Electronics Engineers (IEEE), IEEE Std 45, Recommended Practice for Electrical Installations on Shipboard.

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Institute of Electrical and Electronics Engineers (IEEE), IEEE Std C57.12.70, Standard Terminal Markings and Connections for Distribution and Power Transformers.

MIL-HDBK-290, Standard Electrical Symbol List.

MIL-STD-1472, Design Criteria Standard, Human Engineering.

MIL-DTL-24643, General Specification for Cables, Electric, Low Smoke Halogen Free

NAVSEA S0300-AU-IDX-010/SATDI , Electrical Standard and Type Drawing Index.

National Electrical Manufacturers Association, NEMA ICS (Series), Industrial Control and Systems General Requirements.

National Electrical Manufacturers Association, NEMA MG 1 (Series), Motors and Generators.

Society of Automotive Engineers (SAE), SAE-AMS-I-23053/2, Insulation Sleeving, Electrical, Heat Shrinkable, Polyvinyl Chloride, Flexible, Crosslinked and Non-Crosslinked.

Society of Automotive Engineers (SAE), SAE-AMS-DTL-23053/5, Insulation Sleeving, Electrical, Heat Shrinkable, Polyolefin, Flexible, Crosslinked.

3. REQUIREMENTS

3.1 General Information.

3.1.1 Information Plates. Information plates, label plates, and tags shall be installed for equipment, circuits, conductors and cables for power, lighting, electronics, interior communications and other electrical systems.

3.1.2 Nameplates. Nameplates for motors, generators, transformers, control apparatus, switchboards, heaters, brakes, and clutches shall be in accordance with applicable nameplate sections of IEEE Std 45.

3.1.3 Electric Machinery Coupled to Other Machinery. Except as otherwise specified, electric machinery that is coupled to other machinery, such as a pump driven by a motor need have only one label plate with appropriate designation.

3.1.4 Location. Information plates, identification plates, label plates and tags shall be installed in readily visible locations on the equipment or types of equipment they identify, or if this is not practicable, on adjacent structure.

3.1.5 Remote Location. When equipment is installed in a remote or isolated location, an additional information plate shall be attached to or adjacent to the access to the equipment.

This information plate shall identify and locate the equipment within a simple location diagram enclosed in clear plastic.

3.1.6 Numbering. Numbering of electric machinery or similar equipment in a system: Similar equipment in a system shall comprise a group, and each group shall be assigned a separate series

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of consecutive numbers, each series beginning with 1. The number shall be assigned in the order that the equipment is added to the system. If a modification to the system requires the removal of a piece of equipment from the system, its number shall not be reassigned. Like equipment shall generally be numbered from forward to aft (primary), lower to higher (secondary) and inboard to outboard (tertiary), except that numbering of main propulsion components shall be the same as the associated main propulsion unit. Main propulsion units are ordered sequentially from the most outboard starboard (No. 1) to the most outboard port (highest number). Where multiple like components serve the same main propulsion unit or switchboard, a suffix letter starting with “A” shall be used to distinguish between the two components, e.g. No., 2B Main Motor Blower. See Figure 1 below:

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Figure 1 - Example

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3.2 Terms and Definitions.

3.2.1 Basic Location Number. A series of three numbers, separated by hyphens, designating in the following sequence the vertical, longitudinal, and transverse location of a component in the ship.

3.2.1.1 First Number. The first number shall indicate the vertical level at which the component is located, by deck or platform number.

3.2.1.2 Since the machinery spaces can have multiple levels within the space and varying heights within a single level the following shall apply for determining the vertical level: For legacy Cutters follow the label plate convention already established for the Class. For new construction the shipyard/contractor shall provide a plan demonstrating the dividing line between deck levels within the machinery spaces to the Coast Guard Technical Authority for review and approval. Machinery spaces shall include but not limited to Engine Rooms, Generator Rooms, Auxiliary Machinery Rooms, Steering Gear Rooms, and any other compartment with the compartment designation ending in “E”.

3.2.1.3 Second Number. The second number shall indicate the longitudinal location of the component by frame number. If the component is not on a frame, the next forward frame number shall be used. If the next forward frame is in the compartment forward of the compartment with the component, the next frame number aft of the component shall be used.

3.2.1.4 Third Number. The third number shall indicate the transverse location by assigning of consecutive odd numbers for starboard locations and consecutive even numbers for port locations. The numeral "1" shall indicate the lowest centerline (or centermost starboard) component.

3.2.1.5 Numbering Selection. Consecutive odd or even numbers shall be assigned to components as they would be observed as being above, from forward to next aft frame, and then outboard of the preceding component.

3.2.1.6 An example is shown below:

Figure 2 - Example

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3.2.2 Caution Plate. A plate that bears essential precautionary information which could result in damage to the equipment, systems or adjacent structure if ignored. Safety information may be included on applicable information plates.

3.2.3 Casualty Power Distribution System. A system consisting of through-bulkhead and through-deck terminals (with permanently installed riser cables) and portable cables, strategically located throughout the ship, for the purpose of bridging damaged sections of the ship service and emergency power systems in order to re-energize designated vital electrical functions.

3.2.4 Cable or Circuit Identification. Cable or circuit identifiers are changed every time the cable or circuit is partitioned by a protective device in the following sequence:

• Generator to switchboard.

• Bus tie between switchboards.

• Bus feeder to load center.

• Feeder to power panel or load.

• Main from a power panel.

• Submain from a main connection box.

• Branch from a submain connection box.

• Subbranch from a branch connection box Also,

• Section - A portion of a circuit not partitioned by a protective device but interrupted by terminal connection.

• Shore feeder from switchboard to shore power receptacles.

3.2.5 Control System. A subsystem associated with any electrical function for the purpose of supervising its operation from one or more locations.

3.2.6 Darkened Ship. The ship condition established to ensure light security. This is achieved through the use of light traps, door operated switches, darkened ship control circuits, and material classifications assigned to certain doors and hatches.

3.2.7 Electrical Distribution Equipment. Electrical standard distribution equipment as defined in the NAVSEA S0300-AU-IDX-010/SATDI and MIL-HDBK-290.

3.2.8 Emergency Power Distribution System. The ship's emergency power system, normally connected to the ship service system, capable of sustained independent operation when supplied from an emergency generator and designed to supply emergency power to designated vital electrical functions.

3.2.9 Identification Plate. A plate installed by a manufacturer on machinery or equipment which bears essential identification data.

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3.2.10 Information Plate. A plate affixed by a manufacturer or installation activity that bears essential warning, operating, and maintenance instructions.

3.2.11 Label Plate. A plate affixed by the installing activity which designates the component as part of a shipboard system, designates basic location number of a component, or provides other necessary identification or information in addition to that appearing on identification plates or information plates.

3.2.12 Lighting Distribution System. A subsidiary of the ship service and emergency power systems that has a primary function to light the ship. The secondary function is to furnish power to small appliances and service outlets of the same voltage and frequency.

3.2.13 Marking Plate. A plate used as an identification, information, or label plate.

3.2.14 Posted Diagram. A plate that displays an exact copy of a system or equipment diagram taken from the applicable system or equipment technical manual.

3.2.15 Posted Operating Instruction. A plate or laminated sheet that displays an exact copy of operating instructions taken from the applicable system or equipment technical manual.

3.2.16 Radial Distribution. The method of power distribution, using a ship service switchboard as the starting point for assigned feeders supplying power panels and individual loads.

3.2.17 Reference Data Plate. A plate that displays frequently used and generally unchanging data which is useful to the operator, such as battery Temperature/Voltage/Gases data, speed or depth or both limits for hard up thrust bearing operation, voltage or current or both limitations for the single phase motor, lubrication charts for lubrication systems.

3.2.18 Ship Service Power Distribution System. The ship's main 60 Hz power system and the normal power source for most electrical functions.

3.2.19 Special Power Distribution Subsystems. These subsystems supply, via electrical conversion equipment, functions and systems having specific voltage, frequency, and regulation characteristics not directly obtainable from the ship service or emergency power distribution systems.

3.2.20 Standard Methods. Installation methods shown in MIL-STD-2003.

3.2.21 Systems Identification. A series of numbers and letters separated by hyphens, designating the frequency of the electric power followed by the service designation letters. For direct current equipment use the designation DC in lieu of the frequency. For power conversion equipment, the output power's frequency and service designation are used.

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3.2.22 Cable Tag. A label bearing identification or data pertinent to the item to which it is attached.

3.2.23 Warning Plate. A plate that bears essential precautionary information that may result in personal injury if ignored.

3.2.24 Zone Distribution. A modification of the radial pattern, adaptable to large ships, wherein the ship is subdivided into zones using main subdivision bulkheads as boundaries. Each zone contains one or more load center switchboards for supplying power panels and individual loads within the zone.

3.3 Power and Lighting Equipment. The following special requirements apply to numbering electric equipment for power and lighting:

3.3.1 Switchboards. Switchboards supplied directly from generators shall be designated as follows:

• Switchboards for ship service generators: 1S, 2S, etc. as necessary to designate all ship service switchboards.

• Switchboards for emergency generators, if provided: 1E, 2E, etc. as necessary to designate all emergency switchboards.

• Switchboards for special frequency generators or static inverters, if provided: 1SF, 2SF, etc. as necessary to designate all special frequency switchboards.

• Switchboards for ship service batteries or direct current generators, if provided: 1B, 2B, etc. as necessary to designate all such switchboards.

• Switchboards for main propulsion or medium voltage generators, if provided: 1P, 2P, etc. as necessary to designate all such switchboards.

• Switchboards for main propulsion shaft driven (thruster) generators, if provided: 1T, 2T, etc. as necessary to designate all such switchboards.

3.3.1.1 In these designations the initial numeral denotes the number of the switchboard, determined in accordance with the above general rule for numbering. The letter(s) characterize the power sources above.

3.3.1.2 Sections of a switchboard not connected to the generator section by bus bars shall be designated by an additional suffix letter, beginning with the letter A and proceeding in alphabetical order from left to right, facing the front of the switchboard. See Figure 3 below:

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Figure 3 - Example

3.3.2 Load Center Switchboards. The load center switchboards shall be designated by the system identification, the letters LC preceding two digits. The first digit shall indicate the zone and the second digit the number of the load center switchboard within that zone, determined in accordance with the general rule for numbering.

3.3.3 Group Control Centers. The group control center switchboards shall be designated by the system identification, the letters GC preceding two digits. The first digit shall indicate the zone and the second digit the number of the group control center switchboard within that zone, determined in accordance with the general rule for numbering.

3.3.4 Motor Control Centers. Motor control centers provide a common enclosure for multiple motor controllers. The motor control centers shall be designated by the system identification, the letters MC preceding two digits. The first digit shall indicate the zone and the second digit the number of the group control center switchboard within that zone, determined in accordance with the general rule for numbering.

3.3.5 Generators. Generators (except motor generators) shall be numbered to correspond to the numbering of the prime mover. Where numbering the generators in the previous sentence is not practical; Starboard generators shall be numbered as 1 (inboard) and 3 (outboard) to feed a starboard switchboard and a port generator shall be numbered as 2 (inboard) and 4 (outboard) to feed a port switchboard.

3.3.6 Motor Generators. Motor generators shall be designated by the system identification and the letters MG preceding the basic location number.

3.3.7 Transformers. Transformers shall be designated by the system identification and by the letters TF preceding the basic location number.

3.3.8 Isolations Transformers. Isolation transformers shall be designated by the letters TF preceding the basic location number.

3.3.9 Line Voltage Regulators. Line voltage regulators shall be designated by the system identification, and by the letters LR preceding the number, which shall be determined by the general rule for numbering given above.

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3.3.10 Static Conversion Power Supplies. Static frequency conversion power supplies shall be designated by the system identification, and by the letters SFC preceding the numeral which shall be determined in accordance with the general rule for numbering given above.

3.3.11 Bus Transfer Devices. Bus transfer devices shall be assigned the system identification and the letters ABT or MBT (Automatic Bus Transfer or Manual Bus Transfer) preceding the basic location number.

3.3.12 Distribution Panels. Each panel shall have a basic location number. The letter or letters shall be assigned as follows:

• EL – Emergency lighting.

• EP – Emergency power.

• L - Ship service lighting.

• N - Navigation lights.

• P - Power and miscellaneous.

• SF - Ship service 400 Hz.

• WP - Weapons system power, DC and 60 Hz.

• WSF - Weapons system power, 400 Hz.

3.4 Equipment Designation. Switchboards and apparatus mounted on power and lighting switchboards, distribution panels and bus transfer equipment shall have identification, label, and information plates with information complying with SFLC.

3.4.1 Cabinet Label Plates. Distribution panels and bus transfer equipment shall have cabinet label plates containing the following information in the order listed:

• Name of space (or apparatus or circuits) served.

• Service (such as power, lighting, or electronics) and panel basic location number.

• Supply feeder number (if panels contain two or more sets of buses and each set is supplied by a separate feeder, their information plates shall be marked with the number of each feeder).

• Example: Crew living space, frames 106-147, first platform, lighting panel 4-107-1;

Feeder 1E/2S-4L-(4-107-1).

3.4.2 Circuit Label Plates. Distribution panels shall have circuit label plates adjacent to the handle of each circuit breaker or switch; information in the order listed:

• Trip element rating.

• Circuit designation.

• Name of apparatus or circuit controlled.

• Location of apparatus or space served.

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3.4.3 Directory Type Label Plate. Distribution panels may have a directory type label plate which combines all of the above individual information for one panel on one label plate.

3.4.4 De-Energized Circuits. Panel switches controlling circuits that are de-energized during darkened ship operation shall be marked DARKENED SHIP.

• The ON and OFF positions of these switches shall be marked LIGHT SHIP and DARKENED SHIP respectively.

3.4.5 Spare Circuit Breakers. Label plates without markings shall be provided for mounted spare circuit breakers.

3.4.6 Class Z and Class Circle W. Label plates immediately above circuit breakers for Class Z and Class Circle W ventilation feeders on switchboards shall be of a standard size, not wider than the circuit breaker, and shall be fitted with a suitable red marker similar to Figure 4:

Figure 4 - Typical Identification Plates and Red Markers

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3.4.6.1 In addition to the feeder designation, the information plate shall contain the closure designation of the ventilation system supplied and shall have a 1 inch Circle W or Z as required, located at the left extremity of the plate.

3.4.7 Cable and Conductor Markings. Cables and conductors on switchboards and panels, except short lengths of internal wiring that can be readily traced, shall be marked near each terminal to identify the conductors with the terminals to which they are to be connected.

3.4.8 Marking Continuity. The installed marking numbers, letters or combinations shall be in agreement with those shown on wiring drawings.

3.4.9 Fuse Boxes. Label plates shall be provided on or in boxes, for each set of fuses, and shall indicate the circuit controlled, the phases or polarities, the fuse ampere ratings, and fuse characteristic symbol.

3.4.10 Rotating AC and DC Equipment, Controllers, and Transformers. This equipment shall have each terminal marked with standard designations in accordance with NEMA MG 1, NEMA ICS (Series) and IEEE Std C57.12.70. Markings shall be accomplished by either information plates adjacent to terminal studs or stamping on terminals.

3.4.11 Weapons and Electronic Systems Equipment. Terminal, connection and splice boxes shall have label plates marked with a C for IC equipment, or G for weapons control equipment, followed by a dash, circuit letters, and the number of the equipment, determined in accordance with the general rule for numbering.

3.5 Degaussing Equipment. The following special requirements apply to numbering degaussing equipment:

• Connection boxes and through boxes in the M, FI-QI and FP-QP coils shall be numbered in sequence, starting at the bow and continuing aft along the port side in a counterclockwise direction around the ship.

• Boxes for the A and L coils shall receive the next higher numbers, respectively, after the numbers for the M, FI-QI and FP-QP coils have been assigned.

• Numbers for the A coil shall be in sequence, starting with the highest forward box and continuing aft on both the upper A1 and A2 loops, thence down to, and forward on, the lower runs.

• Numbers for the L coil shall be in sequence, starting with the highest forward box on the port side and continuing aft along the port side in a counterclockwise direction around the ship.

• Boxes on the centerline shall be considered to be on the port side.

3.5.1 Degaussing Equipment Label Plates. A label plate designating the respective connected degaussing coil shall be secured to each coil power supply. An information plate shall be installed near each ammeter on the degaussing control unit as follows:

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CAUTION:

DO NOT EXCEED _________ AMPERES

• The amperes indicated on the plates shall be the maximum current permissible without exceeding the rating of the applicable power supply or the degaussing cable connected to the power supply, whichever is less.

• An information plate, indicating the need for and procedure for securing equipment by reversals shall be installed on the degaussing control unit (switchboard). If determined, during dockside compensation of the magnetic compass that securing the degaussing coil currents by reversals is necessary, the information plate shall provide step-by-step procedure for securing degaussing coils.

• Connection boxes and through boxes shall have label plates marked as follows:

TABLE 1 - Label Plate Markings

Degaussing box number D1, D2, D3

Connection box or through box (or both) M1, M2, M3

Coil and loop designation L1, L2, L3

Example D1

Connection Box Through box

M1 L1

M2 L2

• This represents the number one degaussing box serving as a connection box for the M1 and M2 loops and as a through box for the L1 and L2 loops.

• Figure 5 is a typical example of a designation scheme for degaussing coil cables, feeders, and connection boxes.

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Figure 5 - Designation Scheme for Degaussing Coil Cables Feeders and Connection Boxes

Figure 6 is a typical example of a single loop connection box D5 (M coil) starboard side with the viewer looking starboard.

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Figure 6 - Typical Single Loop Connection Box

3.6 Isolated Receptacle Circuits. A yellow label plate shall be installed on or near each panel, junction, or distribution box supplying these circuits and inscribed as follows:

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CAUTION:

DO NOT CONNECT ADDITIONAL FIXTURES OR RECEPTACLES TO THIS

CIRCUIT.

3.6.1 Receptacles. Receptacles for waterline security lights shall have label plates identifying the system from which they are fed.

3.7 Cable and Conductor Identification. Permanently installed cables shall be tagged close to each point of connection, and on both sides of decks and bulkheads except as follows:

• Where through cable runs within a compartment are direct (such as a vertical run between decks), a single tag will suffice.

• Cables with both points of connection within a compartment and which can be readily traced need not be tagged.

• Where compartments are subdivided by internal bulkheads or where machinery or installed equipment makes tracing of cable runs difficult, additional tags shall be provided.

• For multiple cable penetrations of decks and bulkheads (main cableways) individual cable tags can be omitted, and in lieu thereof, an identification plate shall be installed adjacent to the cableway penetration area showing each cable designation in the order of location in the penetration area.

3.8 Cable Designations.

3.8.1 Propulsion, Power, and Lighting Cables. The designation of propulsion, power, and lighting cables shall be designated with the identification number for the cable determined in accordance with the general rule. It shall consist of three parts in sequence separated by hyphens:

a source prefix, a voltage code and cable service designation, and a destination suffix.

3.8.2 Normal and Alternate or Emergency Cables. For cables that have normal and alternate or an emergency feeder, the source designation shall contain, first the source of the normal feed and second, separated by a slant line, the designation of the source of the alternate or emergency feed (e.g., for example: 1S/2S-, 1S/1E-).

3.8.3 Circuit Breaker Cables. For the purpose of designating the source of cables originating from switchboards, panelboards, or load centers, the source shall be the circuit breaker enclosure designator, e.g., 2S, (1-51-1), P12, LC3.

3.8.4 Bus Transfer Switch Cables. For cables that have normal and alternate or emergency feeders, the source designation shall contain, first the source of the normal feed and second, separated by a slant line, the designation of the source of the alternate or emergency feed, e.g., 1S/2S, 1S/1E.

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3.8.5 Generator Cables. For the purpose of designating the source on power cables between generators and switchboards, generators shall be given numbers (these numbers are for generator cable marking purposes only and shall not appear on the generator label plate).

3.8.5.1 If only one generator supplies a switchboard, the generator shall have the same number as that of the switchboard plus the letter G. Thus, 1SG denotes the ship service generator that supplies the 1S ship service switchboard.

3.8.5.2 If more than one generator supplies a switchboard, the first generator determined in accordance with the general rule of numbering shall have the letter A immediately following the designation; the second generator that supplies the switchboard shall have the letter B, and this procedure shall be continued for all generators that supply the switchboard and then repeated for succeeding switchboards (thus, 1SGA and 1SGB denote the two ship service generators that supply the 1S ship service switchboard).

3.8.5.3 For medium voltage generators, the starboard generator(s) shall be oddly numbered from inboard to outboard with a suffix G starting from the most forward generator room (thus, 1G and 3G denote the two ship generators that supply the 1P main switchboard). The port generator(s) shall be evenly numbered similarly. For cutters with three medium voltage generators symmetrically located about the cutter’s longitudinal centerline, the machine designators shall be 1G or SG (starboard), 2G or CG (centerline), and 3G or PG (port).

3.8.6 Shore Power Feeder Cables. Cables running between a topside shore power receptacle and an on board circuit breaker shall be designated with PS as the source. For cutters with multiple shore power receptacle locations (e.g., forward & aft or starboard & port), 1PS and 2PS shall be used instead.

3.8.7 Frequency Changer Cables. For the purpose of designating the source on power cables between solid state frequency changers and special frequency switchboards, frequency changers shall be given numbers (these numbers are for frequency changer cable marking purposes only and shall not appear on the frequency changer label plate).

3.8.7.1 If only one frequency changer supplies a switchboard, the frequency changer shall have the same number as that of the switchboard plus the letter C. Thus: 1SFC denotes one special frequency changer that supplies one special frequency switchboard.

3.8.7.2 If more than one frequency changer supplies a switchboard, the first frequency changer determined in accordance with the general rule of numbering shall have the letter A immediately following the designation; the second frequency changer that supplies the switchboard shall have the letter B, and this procedure shall be continued for frequency changers that supply the switchboard and then repeated for succeeding switchboards (thus 1SFCA and 1SFCB denote two special frequency changers that supply one special frequency switchboard).

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3.8.8 Cables with Alpha or Alpha-Numeric Designators. Cables to power consuming equipment shall receive a single letter designator, beginning with A and progressing through the alphabet for each succeeding piece of power consuming equipment supplied from the same distribution equipment.

• If only one frequency changer supplies a switchboard, the frequency changer shall have the same number as that of the switchboard plus the letter C. Thus: 1SFC denotes one special frequency changer that supplies one special frequency switchboard.

• If more than one frequency changer supplies a switchboard, the first frequency changer determined in accordance with the general rule of numbering shall have the letter A immediately following the designation; the second frequency changer that supplies the switchboard shall have the letter B, and this procedure shall be continued for frequency changers that supply the switchboard and then repeated for succeeding switchboards (thus 1SFCA and 1SFCB denote two special frequency changers that supply the 1SF special frequency switchboard).

3.8.9 Voltage Code. The numbers used to designate conductor voltage shall comply with the following:

TABLE 2 - Conductor Voltage

Voltage Designation (See Note 2)

0-99 See note 1

100-199 1

200-299 2

300-399 3

400-499 4

500-599 5

600-699 6

700-799 7

800-899 8

900-999 9

1000-1999 10

2000-2999 20

3000-3999 30

4000-4999 40

5000-5999 50

6000-6999 60

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1 Potentials below 100 volts shall be designated by the actual voltage (e.g., 24 for a 24 volt circuit).

2 For a 4 wire, three phase system, the cable voltage designation shall indicate the higher line-to-line voltage.

3.8.10 Cable Service Designation. The following letters shall be used to designate the various cable services:

TABLE 3 - Cable Services

Services Designations

Cathodic protection CPS

Night flight lights (visual landing aids) FL

Control, power plant and ship (motor starters and heater contactors)

K

Degaussing D

Electronics R

Interior communications C

Lighting, emergency EL

Lighting, navigational N

Lighting, ship service L

Power, casualty CP

Power, emergency EP

Power, non-sensitive ship service PN

Power, propulsion PP

Power, sensitive ship service PS

Power, ship service P

Power, shore connections PS

Power, special frequency SF

Power, weapon system WP

Power, weapon system, special frequency WSF

3.8.11 Destination Suffix.

3.8.11.1 Destinations with alpha or alpha-numeric designators. Cables to power consuming equipment shall receive a single letter designator, beginning with A and progressing through the alphabet for each succeeding piece of power consuming equipment supplied from the same distribution equipment. To prevent confusion with the numerals one and zero, the letters I, O, and Q shall not be used.

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• The designator for cables connected to distribution boxes shall consist of, alternately, a letter, a number, a letter, and a number, progressively every time that it is fused or extended through a junction box or fixture.

• The designator shall not be changed on single circuits which branch from a terminal box or distribution box, although a suffix number in parenthesis indicating the cable section shall be added to the designator.

3.8.12 Destinations with Basic Location Numbers. The basic location number shall be used as the destination designation, e.g., (2-24-0).

3.8.13 Component Parts. Component parts of the above examples indicate the following:

TABLE 4 - Component Parts

Component Meaning

1SG Ship service generator supplying ship service switchboard No. 1S.

2SGA Ship service generator A (where 2 or more are used) supplying ship service switchboard No. 2S.

2SGB Ship service generator B (where 2 or more are used) supplying ship service switchboard No. 2S.

2SFG Special frequency generator supplying special frequency switchboard No. 2SF.

1EG Emergency generator supplying emergency switchboard No. 1E.

3S Ship service switchboard No. 3.

1S Ship service switchboard No. 1.

1SF Special frequency switchboard No. 1.

2SF Special frequency switchboard No. 2.

1E Emergency switchboard No. 1.

3SA Section A of ship service switchboard No. 3S.

3SB Section B of ship service switchboard No. 3S.

LC31 No. 1 load center switchboard in zone 3.

LC1 No. 1 load center switchboard on ships with radial distribution.

4P 450 V ship service power.

1SF 115 V special frequency power.

4EP 450 V emergency power.

1EL 120 V emergency lighting.

4L 450 V ship service lighting.

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Component Meaning

1L 120 V ship service lighting.

28SF 28 V special frequency.

(1-85-3) Distribution panel located on 1st deck frame 85, second one outboard of the centerline on the starboard side.

(2-142-1) Distribution panel located on 2nd deck frame 142, first one outboard of the centerline on the starboard side.

(3-125-2) Distribution panel located on 3rd deck frame 125, first one outboard of the centerline on the port side.

(5-52-4) Distribution panel located on 5th deck frame 52, second one outboard of the centerline on the port side.

(2-11-3)(1) Section one of cable connected to distribution panel located on 2nd deck, frame 11, second one outboard of the centerline on the starboard side.

A No. 1 feeder, main, or submain supplied from load center switchboard or distribution panel.

B No. 2 feeder, main, or submain supplied from load center switchboard or distribution panel.

A1 No. 1 submain or branch supplied from distribution panel or distribution box.

A2 No. 2 submain or branch supplied from distribution panel or distribution box.

B1 No. 1 submain or branch supplied from distribution panel or distribution box.

A2B No. 2 branch or sub-branch supplied from distribution box.

B1A No. 1 branch or sub-branch supplied from distribution box.

B1A2 No. 2 sub-branch supplied from distribution box.

(NORM) Normal feeder to bus transfer device.

(ALTN) Alternate feeder to bus transfer device.

3.8.14 Destinations with Power Panel or Load Center Numbers. The power panel or load center number shall be used as the destination designation, e.g., P7 or LC1. Examples of typical power and lighting cable designation are given as follows:

TABLE 5 - Destination Designation

Cable Type: Designation Remarks

Generator cable:

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Cable Type: Designation Remarks

1SG-4P-1S For a cable supplying 400-499 volt ships service power to #1 ship service switchboard from a single generator.

2SGA-4P-2S

2SGB-4P-2S

For cables supplying 400-499 volt ships service power to #2 ship service switchboard from two generators.

2SFG-1SF-2SF For a cable supplying special frequency power ranging from 100-199 volts to a special frequency switchboard from a single special frequency generator.

1EG-4EP-1E For a cable supplying 400-499 volt emergency power to an emergency switchboard from a single emergency generator.

1SFC-1SF-1SF For a cable supplying special frequency power ranging from 100-199 volts to special frequency switchboard from a solid state frequency changer.

Bus tie cable:

1S-4P-2S For the cables supplying 400-499 volt ships service power between #1 and #2 ship service switchboards.

3S-4P-1E For the cables supplying 400-499 volt ships service power between a #3ship service switchboard and #1 emergency switchboard.

1SF-4SF-2SF For the cables between two special frequency switchboards.

Switchboard sections interconnecting cable:

3S-4P-3SB For the cable carrying 400-499 volt ships service power between the #3 generator section and section B of the #3 switchboard.

3SA-4P-3SB For the cable supplying 400-499 volt ships service power between sections A and B of the #3 switchboard.

Bus feeder:

2S-4P-LC31 For a cable supplying 400-499 volt ships service power a load center from #2 ship service switchboard on ships with zonal distribution.

Feeder:

LC31-4P-(3-125-2)(NORM) For feeders supplying a distribution panel from a load center on ships with zonal distribution.

Feeder cable:

6SG-4P-6S For a cable supplying a ship service switchboard from a single generator.

LC1S-4P-A(ALTN) For feeders supplying branch circuit power consuming equipment from a load center.

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Cable Type: Designation Remarks

3S-4L-(2-11-3)(1) For the first section of a feeder with more than one section.

Main:

(3-125-2)-1L-B

(1-85-3)-1EL-A

For feeders supplying loads through main, submain, branches, branches from a distribution panel.

Submain:

(3-125-2)-1L-B1

(2-142-1)-1L-A

(1-85-3)-1EL-A1

(5-52-4)-28SF-B1

Branch:

(3-125-2)-1L-B1A (2-142-1)-1L-A2

Subbranch:

(3-125-2)-1L-B1A2 (2-142-1)-1L-A2B

3.8.15 Miscellaneous System Cables. The designation of miscellaneous system cables shall consist of two parts in sequence separated by a hyphen: system circuit prefix and a sequential number as described below.

3.8.16 Navigation and Signal, Light Cables. Cables that extend beyond the navigation light supply and control panels shall be designated by the letter N followed by a 2 digit number, beginning with the number 10 assigned consecutively throughout the ship.

• Each conductor shall be marked at each end to identify the conductor.

• The conductor markings shall consist of a number assigned to each connection point on the schematic or elementary diagram starting with 101.

• Conductors emanating from a connection point shall retain the number of that point until they terminate.

• Connection points which are common to each other shall bear the same number.

• Spare conductors and terminals shall be unmarked.

3.8.17 Casualty Power System Cables. Permanent cables shall be marked with the letters CP.

• Portable cables shall be marked with a cable tag near each end, bearing the basic location number of the cable rack on which it is stowed, and the length of the cable in feet.

• Tags shall be attached to casualty power cables in accordance with MIL-STD-2003.

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• Casualty power riser terminals and each end of all bulkhead terminals shall be identified by label plates bearing the basic location number of the opposite end of the permanently installed portion of the casualty power system.

• The label plates shall be mounted adjacent to the terminals on the bulkhead.

• Each cable rack shall be identified by a label plate giving the length in feet and the quantities of each cable stowed on the cable rack and the basic location number of the cable rack.

3.8.18 Power Control Circuit Cables. Where intricate control circuits are required or where auxiliaries are closely associated as a single system, the cables shall be marked with a circuit designation as shown below (See section 3.8.10, Cable service designation). Where one system receives a control signal from another system, the interconnecting cable shall be numbered in the system which utilizes the signal.

3.8.18.1 Electric Plant.

TABLE 6 - Circuit Designation

Designation Remarks

K-EC Electric plant control and indication (circuit breaker control, synchronizing, interlocking, ground detection, metering)

K-EG Emergency generator control and indication

K-MG Motor generator control and indication (including speed control and generator voltage regulator)

K-PG Propulsion generator control and indication (including governor control)

K-PM Propulsion motor and auxiliaries control and indication

K-SG Ship service generator control and indication (including governor and voltage regulator)

K-AS Aircraft servicing control (28 VDC and 115 volt, 400 Hz)

K-DG Ship service diesel generator control and indication (including governor and voltage regulator)

3.8.18.2 Machinery Plant.

TABLE 7 - Circuit Designation

Designation Remarks

K-EH Electric hydraulic system control

K-FF Fire fighting system control

K-RO Reverse osmosis desalination plant controls

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Designation Remarks

K-SD Steam distilling plant control

K-SX Propulsion control and indication

K-PC Machinery & propulsion plant instrumentation & control

K-PT Propulsion turbine control and indication

3.8.18.3 Miscellaneous.

TABLE 8 - Circuit Designation

Designation Remarks

K-AS Aircraft servicing control

K-DG Diesel generator control and indication

K-EH Electric hydraulic system control

K-FF Fire fighting system control

K-FL Night flight light control

K-HL Hangar deck lighting control

K-RO Reverse osmosis desalination plant controls

3.8.18.4 If two or more systems are installed that will require identical designating letters, differentiating numbers in sequence beginning with 1 shall be used preceding the circuit letters (e.g., K-1DG, K-2DG).

• Where other installations develop such that they require intricate control wiring systems, the cables shall be marked with a designation similar to the above.

• The letters selected for identification shall not conflict with any other designation provided herein.

3.8.18.5 A number shall be assigned to each cable on the ship’s installed cables and on ship’s system schematic or elementary diagram, starting with 1.

3.8.18.6 The following are examples of the above method of cable numbering:

• Example: Cable Number K-DG15

• K indicates a control circuit.

• DG indicates a Diesel generator control and indication.

• 15 indicates that this is the fifteenth cable in the circuit.

• Example: Cable Number K-1SG10

• K indicates a control circuit.

• 1SG indicates a No. 1 ship service generator control circuit.

• 10 indicates the tenth cable in the circuit.

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3.8.18.7 Conductors in control system cables shall be marked at each end. These markings shall consist of the number and letter combination to identify the circuit, followed by a number to be determined as follows:

• A number starting with 101 shall be assigned to each connection point on the ship system schematic or elementary diagram.

• All conductors emanating from a connection point shall retain the number of that point until they terminate at a terminal board or a device, such as a switch, fuse, relay, disconnect, or indicator light.

• Drawings shall show the changeover (such as provided by a terminal board) from the ship numbering to the numbering system of the equipment wiring as provided by the equipment manufacturer.

• Each cable conductor shall be identified on each side of the changeover point, both on the drawing and on the installed cable, in order that identification may be followed from one numbering system to the other.

• Common connection points and the conductors between them shall all bear the same number.

• The following is an example of the above method of conductor numbering:

• Example: Conductor number K-1DG120

• K indicates that this is a control circuit.

• 1DG indicates No. 1 diesel generator control circuit.

• 120 indicates that the conductor emanates from connection point 120.

3.8.19 Degaussing Cables. Feeders, mains, and other cables supplying power to degaussing control panels shall be designated as specified above for power and lighting circuits. The following letters shall be used in marking degaussing cables connected to the load side of degaussing control equipment:

TABLE 9 - Marking Degaussing Cables

Equipment Designation

Ammeter AMM

Athwartships coil (A coil) A

Auxiliary athwartships coil AX

Auxiliary longitudinal coil LX

Auxiliary main coil MX

Compass compensating coil CC

Degaussing system D

Feeder FDR

Forecastle coil to correct for induced magnetism FI

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Equipment Designation

Forecastle coil to correct for permanent magnetism FP

Indicator light IL

Longitudinal coil (L coil) L

Main coil (M coil) M

Quarter deck coil to correct for induced magnetism QI

Quarter deck coil to correct for permanent magnetism QP

Used in conjunction with FDR, CC, or IL for such leads to FI – QI coil

I

Used in conjunction with FDR, CC, or IL for such leads to FP – QP coil

P

3.8.19.1 Degaussing coil cable tags shall be marked with a D, a dash, a number (1, 2, 3,...) for the cable of the coil, the appropriate coil letter designation, a second dash, and another number (1, 2, 3...) to designate the section of the cable. A section of a degaussing coil cable is the length of cable between two successive connections or through boxes. The cable number shall be retained for one complete turn, or to the end of the cable if it does not make a complete turn. See example given in 3.8.19.6.

3.8.19.2 Section numbers shall be assigned to cables in coils as follows:

• Horizontal (M) and (FI, FP, QI, and QP) coil. Section number 1 shall be the coil that is the farthest forward. The remaining sections shall be numbered in sequence, proceeding around the coil in a counterclockwise direction as viewed from above.

• Athwartship (A) coil. Section number 1 shall be the coil that is the highest and farthest forward. The remaining sections shall be numbered in sequence proceeding around the coil in a counterclockwise direction as viewed from the starboard side.

• Longitudinal (L) coil. Section number 1 shall be the coil that is the highest and farthest forward. The remaining sections shall be numbered in sequence, proceeding around each loop in a counterclockwise direction as viewed from the after side of the loop and proceeding from loop to loop in the direction from fore to aft.

3.8.19.3 A section number shall always be included even if the cable has only one section.

3.8.19.4 Degaussing feeder cable tags shall be marked with a D, a dash, FDR, the appropriate coil letter designation, a second dash, and a section number. The sections of a feeder cable shall be numbered consecutively from 1, beginning with the section nearest the degaussing power supply.

3.8.19.5 The feeder cable that supplies power to the FI-QI coil shall be marked D-FDRI-1, D- FDRI-2, and so on, regardless of whether it connects to the FI or QI coil. Interconnecting cables between the FI and QI coils or the FP and QP coils shall be marked as feeders and shall bear the

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letter designation of the coil to which they carry power (e.g., if the supply feeder runs to the QI coil, the interconnecting cable between the QI and FI coils carries power to the FI coil and shall be designated D-FDRFI-1).

3.8.19.6 Where a single multi-conductor cable is used as a feeder for more than one coil, the cable shall bear the letter designations of the coils to which it carries power. If, for example, a four conductor LSFSGU cable (Defined in MIL-DTL-24643) is used as a feeder cable to carry current from the QI and QP loops to the FI and FP loops, it shall be designated D-FDRFIFP-1.

3.8.19.7 If more than one feeder cable is run to a coil, the feeder cables shall have a number preceding the FDR, for example, D-1FDRM-1, D-2FDRM-1. If single-conductor cables are used as feeder cables, the cable with the positive conductor shall be numbered 1 and the cable with the negative conductor shall be numbered 2. If more than two single-conductor cables are used for the feeder to one coil, odd numbers shall be used for the cables with positive conductors.

3.8.19.8 Feeder cable tags for compass coils and indicator lights shall be marked with the feeder designation, followed by a dash and the appropriate symbol (e.g., D-FDRM-CC, D-FDRI-IL and D-FDRF-IL). Section numbers shall not be used – If a cable contains circuitry for more than one coil, the coil designator shall be omitted (e.g., cable containing the compass compensating coil feeders for the M, FI-QI, and FP-QP coils shall be designated D-DR-CC and a cable containing the indicating light feeders for the FP-QP and FI-QI coils shall be designated D-FDR-IL).

3.8.19.9 Cables containing the control circuits from the coil power supplies to the control unit shall be marked with the appropriate designator, a dash, and “CONT” (e.g., the control cable between the FI-QI coil power supply and the control unit shall be marked D-FDRI-CONT).

3.8.19.10 Cables containing the control circuits between the control unit and the remote control shall be marked D-FDR-RMTCONT.

3.8.20 Degaussing Coil Conductors. Individual conductors, including spares, of each coil cable shall be marked by hot stamping (branding) insulating sleeving of appropriate size or be heat shrinkable sleeving conforming to SAE-AMS-DTL-23053/5, class 1, white, with markings permanently bonded to the tubing by a heat process. The conductor markings shall be of a contrasting color. The following symbols, in order given and as applicable, shall be used:

TABLE 10 - Conductor Markings

Designation Equipment

M, FI, FP, QI, QP, A, ... Degaussing coil.

1, 2, 3, ... Coil loop number. The number shall be omitted if the coil has only one loop.

A, B, C, ... First, second, third parallel circuit in the coil. “A” shall be used if there is only one circuit.

1, 2, 3, ... First, second, third series conductor in circuit.

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Designation Equipment

+ or -, ... Positive or negative geometrical polarity in accordance with subparagraph below.

3.8.20.1 Number 1 shall be used with the M, FI, FP, QI, QP, or A coil loop designation (M1, FI1, FP1, QI1, QP1, or A1) to designate the longest loop of each coil. Number 1 when used with the L coil (L1) shall designate the forward loop. Other loops in each coil shall be numbered in sequence 2, 3, 4, and so on, from bow to stern.

3.8.20.2 The…