260515 BASIC MATERIALS METHODS ELECTRICAL.pdf

TABLE OF CONTENTS

SECTION 260515 – BASIC MATERIALS & METHODS – ELECTRICAL

PART 1 - GENERAL

1.1 REFERENCES

1.2 SCOPE

1.3 SUBMITTALS

1.4 COORDINATION DRAWINGS

1.5 STANDARDS

1.6 UNDERWRITERS LABORATORIES LABELS

PART 2 - PRODUCTS

2.1 CONDUIT AND FITTINGS

2.2 PENETRATION OF FIRE RATED CONSTRUCTION

2.3 PULL BOXES AND JUNCTION BOXES

2.4 BACKBOARDS & EQUIPMENT CABINETS

2.5 CONDUIT HANGERS AND SUPPORTS

2.6 WIRES AND CABLES

2.7 CABLE ASSEMBLIES

2.8 SPLICES

2.9 APPLICATIONS – CONDUIT, CABLES, RACEWAYS

2.10 LOW VOLTAGE CABLE SUPPORTS

2.11 SAFETY SWITCHES AND FUSES

2.12 TERMINAL STRIPS

PART 3 - EXECUTION

3.1 SUPERVISION

3.2 MOTOR AND CONTROL CIRCUIT WIRING

3.3 IDENTIFICATION

3.4 IDENTIFICATION

3.5 INSTALLATION OF CONDUIT, BOXES AND FITTINGS

3.6 INSTALLATION OF CABLES

3.7 INSTALLATION OF BACKBOARDS AND EQUIPMENT CABINETS

3.8 BRANCH CIRCUIT WIRING

3.9 MOTOR CONTROL

BETHANY MIDDLE SCHOOL JUNE 6, 2025

FIRE PUMP REPLACEMENT VAN ZELM #2024090.00

BASIC MATERIALS & METHODS – ELECTRICAL 260515 - 1

SECTION 260515 - BASIC MATERIALS & METHODS - ELECTRICAL

PART 1 - GENERAL

1.1 REFERENCES

A. This Section covers the specification of basic materials and methods for electrical work. Refer to Section – COMMON WORK RESULTS FOR ELECTRICAL WORK, GENERAL CONDITIONS, SUPPLEMENTARY CONDITIONS, applicable sections of DIVISION 1, and all other project instructions for other requirements.

B. Refer to DIVISION 07 specifications – “PENETRATION FIRE STOPPING”.

C. THIS PROJECT WILL BE COMMISSIONED. REFER TO COMMISSIONING

SPECIFICATION SECTIONS FOR COMMISSIONING INFORMATION AND

REPSONSIBILITIES. THE COMMISSIONING PROCESS WILL REQUIRE ADDITIONAL

LABOR, MATERIAL AND/OR OTHER COSTS WHICH MUST BE PROVIDED BY THE

CONTRACTOR AS PART OF THIS PROJECT.

1.2 SCOPE

A. Provide labor, materials, services, equipment and transportation necessary for complete and operational electrical systems as indicated on Contract Drawings and specified herein.

B. Interface with work of Mechanical Trades (Divisions 21, 22, & 23):

1. Division 26 is responsible to supply disconnects, starters and motor controls NOT supplied integral to equipment provided under other divisions, unless otherwise noted.

2. Variable Frequency Drives (VFD) for control of motors which are integral to packaged equipment supplied under other Divisions will be supplied by that Division.

3. Variable Frequency Drives (VFD) will be provided by Division 23, unless otherwise noted.

4. Division 26 is responsible for all power wiring to and from Disconnect Switches, Motor Starters (including VFD’s), and Motors, unless otherwise noted.

5. A source of power to feed mechanical control panels for Building Management (BMS, DDC, etc.) systems is to be made available by Division 26. Line voltage wiring from power source (breaker in panel) to control panels is to be provided by Mechanical Trade where wiring/homerun has not been indicated elsewhere on Contract Drawings.

Coordinate with Division 23 Section, HVAC INSTRUMENTATION AND CONTROLS.

C. This section includes but is not limited to the following:

1. Conduit, cable and fittings

2. Pull boxes and junction boxes

3. Outlet boxes

4. Surface raceways and multi-outlet assemblies

5. Backboards and equipment cabinets

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6. Conduit hangers and supports

7. Wires and cables

8. Splices

9. Safety switches and fuses

10. Terminal strips

11. Labeling and identification

1.3 SUBMITTALS

A. Submit, for review, list of manufacturers and grade or type of material proposed, including wire, wiring devices, terminating systems, connectors, conduit, wireway and fittings. Submit samples if requested.

B. Submit for review shop drawings for all equipment and materials specified under this Section.

C. Prior to final inspection, submit test reports to Architect/Engineer for review.

D. Upon completion of job, furnish reproducible copies of wiring and interconnection diagrams required for clear and permanent record of interconnected equipment, such as alarms and annunciator panels.

1.4 COORDINATION DRAWINGS

A. Refer to Section, PROJECT COORDINATION AND COORDINATION DRAWINGS in this Division.

1.5 STANDARDS

A. All work shall conform to following standards:

1. NEMA Standards.

2. ANSI Standard CI: National Electrical Code (NFPA 70).

3. ANSI Standard C50: Rotating Electrical Machinery.

4. ANSI Standard C501-1: Construction and guide for selection, installation and use of electric motors.

5. ANSI Standard C52.1: Motors and generators (NEMA MG1).

6. ADA: Americans with Disabilities Act

7. Refer to Section COMMON WORK RESULTS for additional requirements

1.6 UNDERWRITERS LABORATORIES LABELS

A. Equipment, materials and components, for which there are listings in UL Product Directories, shall bear UL labels.

BASIC MATERIALS & METHODS – ELECTRICAL 260515 - 3

PART 2 - PRODUCTS

2.1 CONDUIT AND FITTINGS

A. The generic term “Conduit” when reference is made to method of installation and fittings, includes all types of conduit and EMT.

B. Rigid conduit (RMC) shall be UL listed, hot dipped galvanized steel with full cut hot dipped galvanized NPT threads. RMC shall be chromated on all surfaces for corrosion and abrasion protection. Connectors and couplings shall be galvanized steel threaded type listed for RMC use.

C. Intermediate metal conduit (IMC) shall be UL listed, hot galvanized steel with full cut hot galvanized NPT threads and factory-applied interior coating or lining for ease in pulling wires.

Connectors and couplings shall be galvanized steel threaded type listed for IMC use.

D. Electric metallic tubing (EMT) shall be UL listed, hot galvanized steel with factory-applied interior coating or lining for ease in pulling wires. Connectors and couplings shall be galvanized steel, either compression type or heavy-duty set screw-type, listed for EMT use.

Indent or crimp-type connectors are NOT allowed.

E. Non-metallic conduit (NMC) shall be rigid PVC, heavy-wall Schedule 40, UL rated, acceptable equivalent to Carlon "Type 40". Where non-metallic conduit is installed below paved areas, conduit shall be rigid PVC, heavy wall Schedule 80, UL rated and of same manufacturer as the Schedule 40 conduit.

F. Flexible metal conduit (FMC) shall be UL listed, single strip, spirally wound, corrosion-resistant, galvanized steel acceptable equivalent to Liquatite "Type BR". Use galvanized steel fittings and clamps listed for FMC use.

G. Liquid tight flexible metal conduit (LFMC) shall be UL listed, with a flexible core of single spiral wound strip of hot dipped galvanized steel and a liquid-tight jacket of flame-retardant, sun/oil/acid-resistant flexible PVC: Acceptable equivalent to Liquatite "Type LA". Connectors and couplings shall be zinc-plated malleable iron or steel, with engagement inspection window, locknut and sealing ring; liquid-, oil-, and rain-tight; suitable for wet locations; listed for LFMC use: acceptable equivalent to O-Z/Gedney "Type 4Q".

1. Blue Type LA liquid-tight flexible metal conduit (LFMC) shall be used for all wiring beneath raised floor.

2. Grey/Tan Type LA liquid-tight flexible metal conduit (LFMC) shall be used for final connections to vibrating equipment and to partition furniture systems.

H. Minimum Conduit and EMT size: 3/4”

I. Minimum Flexible Metal Conduit Size: 1/2”

J. Special Fittings

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1. Where conduit penetrates air handling unit walls or plenums and in hazardous (classified) locations: provide sealing fittings acceptable equivalent to Crouse-Hinds "EYS Series".

2. Where conduit penetrates waterproof foundation, floor or roof: provide through-wall seals acceptable equivalent to O.Z./Gedney “Type CSMI” on each side of existing walls and O.Z./Gedney “Type FSK” on new walls.

3. Where conduit from underground distribution system enters building, provide cable terminators acceptable equivalent to O.Z./Gedney "Type CSB".

4. Where conduit is exposed at building expansion joint: provide expansion fittings acceptable equivalent to O.Z./Gedney "Type EX" or "Type EXE".

K. Where conduit is in concrete at building expansion or seismic joint and where conduit is exposed at seismic joint: provide expansion/deflection fittings acceptable equivalent to O.Z./Gedney "Type DX".

2.2 PENETRATION OF FIRE RATED CONSTRUCTION

A. Refer to Division 07 Section 260544 and Section 260545 for specific requirements for penetrations of fire rated construction.

2.3 PULL BOXES AND JUNCTION BOXES

A. Boxes shall be heavy duty, stamped steel with covers attached by screws. Provide locknuts for conduit size to which boxes are connected. In finished areas, boxes shall have neatly mitered frame and flush steel cover screwed to the frame.

B. Boxes shall be sized according to NEC.

C. Boxes shall be flush mounted where installed with concealed conduit, and surface mounted elsewhere.

D. Low Voltage Boxes: refer to Section LOW VOLTAGE RACEWAY DISTRIBUTION in this Division.

2.4 BACKBOARDS & EQUIPMENT CABINETS

A. Backboards shall be 3/4” fire-rated plywood painted on all sides before installation, stamp/cable indicating “fire-rating” shall not be painted over. Backboards shall be used for mounting panelboards, grouped switches, starters and other equipment.

B. Equipment cabinets shall be UL listed, sheet steel cabinet with hinged door with catch and lock;

mounted on backboard. Cabinets shall be flush or surface-mounted, sized as required to suit equipment.

C. Refer to Section – LOW VOLTAGE RACEWAY DISTRIBUTION in this Division.

BASIC MATERIALS & METHODS – ELECTRICAL 260515 - 5

2.5 CONDUIT HANGERS AND SUPPORTS

A. Hangers, clips and accessories supporting conduit shall be UL listed.

B. Individual large conduits shall be supported by means of adjustable, malleable hangers of acceptable design placed on maximum 8’-0” centers. Individual small conduits may be held in place by one hole malleable clips.

C. MC cable shall be supported by hangers of acceptable design placed on maximum 4’-0” centers.

MC cable shall be supported within 12” of each fitting.

D. HCFC cable shall be supported by hangers of acceptable design placed on maximum 4’-0” center. HCFC cable shall be supported within 12” of each fitting.

2.6 WIRES AND CABLES

A. Secondary conductors shall be new copper with 600 V code gauge insulation, conforming to NEC requirements, and shall be Type THHN/THWN, rated 75° wet location/90° dry location except as follows:

1. Type XHHW rated 75° wet location/90° dry location shall be used for conductors #3 AWG and larger.

2. Ground wires shall be as specified under Section, ELECTRICAL GROUNDING in this Division, and in accordance with NEC.

3. Type MI cable shall be used where 2 hour ratings are required or where specifically shown in the documents.

4. Type XHHW-2 with cross-linked polyethylene insulation and mineral filler shall be used for low leakage circuits (isolated power).

B. Feeders and branch circuit conductors located below slabs shall be Type THWN-2/XHHW-2, rated 90° for use in dry or wet locations unless noted otherwise.

C. Feeders and branch circuits located below grade shall be Type THWN-2/XHHW-2, rated 90° for use in dry or wet locations unless noted otherwise.

D. Feeders and branch circuit conductors located above grade and within buildings shall be Type THHN/XHHW for use in dry or damp locations unless noted otherwise.

E. When wire sizes are not shown on Contract Drawings, sizes shall be in accordance with NEC but no smaller than following:

1. Light and power wiring: #12 AWG.

2. Control wiring: #14 AWG.

3. Wiring and cable for alarm and signal systems: as recommended by equipment manufacturer.

F. Miscellaneous cables and wires shall be new copper with 600 V code gauge insulation, conforming to NEC requirements as follows:

BASIC MATERIALS & METHODS – ELECTRICAL 260515 - 6

1. Type XF or SFF 150°C shall be used for fixture wiring.

2. Type TFE shall be used for high temperature applications.

3. All Variable Frequency Drives (VFD) and harmonic filters shall have VFD cables as manufactured by Belden or equal for the following:

a. Sizes #12 AWG - #2 AWG, 600 VAC, UL1277, TC-ER, (3) stranded tinned copper conductors plus full size insulated ground, overall Beldfoil plus 85% tinned copper braid shield, full size drain wire, XLPE insulated conductors, black PVC jacket, 1000V UL flexible motor supply cable. Belden #29502 – 29507.

b. Sizes #1AWG - #4/0 AWG – Provide symmetrical design with (3) stranded tinned copper conductors plus (3) symmetrical bare copper grounds, (2) spiral copper tape shields (100% coverage), XLPE insulation, black PVC jacket, 1000V UL flexible motor supply cable. Belden #29528- 29532.

c. Sizes 250kcmil, 350kcmil or 500kcmil, Belden #29533, 29534 or 29535.

G. All multi-purpose feeders and circuits shall include a full size neutral and individual insulated grounding conductor.

1. Each 277 VAC or 120 VAC single phase circuit shall include separate full sized neutral and individual insulated grounding conductors. Shared neutrals or ground conductors are not permitted.

H. Provide cable supports per NEC ARTICLE 300.19, acceptable equivalent to O.Z./Gedney "Type R" for large cables and Kellems "Grips" for bundles of smaller wires.

I. Conductor sizes indicated on plans and in specifications are based on Copper.

1. Use of aluminum conductors for feeders rated at 100A and above will be acceptable.

Aluminum conductors shall have equivalent or higher current carrying capacity and have equal or better voltage drop characteristics as the specified copper conductors.

2. Conduit sizes for feeders with aluminum conductors shall be adjusted (increased) to accommodate larger conductors.

2.7 CABLE ASSEMBLIES

A. Type MC cable shall be UL listed, 600 V, 90°C rated, flexible metal encased multi-conductor assembly; with cable sheath of interlocked galvanized steel strip, copper conductors with Code gauge THHN insulation, and internal green insulated ground: Acceptable equivalent to AFC MC Tuff Type MC-PCS cable. Connectors and fittings shall be galvanized steel, threaded box connectors, listed for MC cable use. Cable sheath of interlocked aluminum is NOT acceptable.

Use of “MCAP” (all-purpose) cable with built-in armor ground and internal un-insulated grounding conductor is NOT acceptable. Type MC cable shall NOT be used for homeruns.

B. Type MC Luminary cable shall be UL listed, 600 V, 90°C rated, flexible metal encased multi-conductor assembly; with cable sheath of interlocked galvanized steel strip, copper conductors with Code gauge THHN/THWN (Power and Neutral) TFN (Control) insulation, and internal green insulated ground: Acceptable equivalent to AFC MC Tuff Type MC-PCS Luminary Cable. Connectors and fittings shall be galvanized steel, threaded box connectors, listed for MC cable use. Cable sheath of interlocked aluminum is NOT acceptable. Use of “MCAP” (all-

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purpose) cable with built-in armor ground and internal un-insulated grounding conductor is NOT acceptable.

C. Type MC Luminary cable shall be UL listed, 600 V, 90°C rated, flexible metal encased multi-conductor assembly; with cable sheath of interlocked aluminum strip, copper conductors with Code gauge THHN/THWN (Power and Neutral) TFN (Control) insulation, and internal green insulated ground: Acceptable equivalent to AFC Type MC-PCS Lite Luminary Cable.

Connectors and fittings shall be galvanized steel, threaded box connectors, listed for MC cable use. Use of “MCAP” (all-purpose) cable with built-in armor ground and internal un-insulated grounding conductor is NOT acceptable.

D. Type MC “Super Neutral” cable shall be UL listed, 600 V, 90°C rated, flexible metal encased multi-conductor assembly; with cable sheath of interlocked galvanized steel strip, copper conductors with Code gauge THHN/THWN (Power and Neutral) TFN (Control) insulation, and internal green insulated ground: Acceptable equivalent to AFC Type MC Super Neutral Cable.

Cable assembly shall be comprised of 1 phase conductor per leg, 1 oversized neutral conductor, 1 ground conductor. Connectors and fittings shall be galvanized steel, threaded box connectors, listed for MC cable use. Cable sheath of interlocked aluminum is NOT acceptable. Use of “MCAP” (all-purpose) cable with built-in armor ground and internal un-insulated grounding conductor is NOT acceptable.

E. Type HCFC cable shall be UL listed, 600 V, 90°C rated, flexible metal encased multi-conductor assembly; with cable sheath of interlocked galvanized steel strip with green stripe, with Code gauge THHN insulation and (2) full sized internal green insulated copper grounding conductors and bare aluminum grounding/bonding conductors: Acceptable equivalent to AFC Type HCF- 90 cable. Connectors and fittings shall be galvanized steel, threaded box connectors, listed for HCFC cable use. Cable sheath of interlocked aluminum is NOT acceptable. Use of “HCF- MCAP” (all-purpose) cable with built-in armor ground and internal un-insulated grounding conductor is NOT acceptable. Type HCFC cable shall NOT be used for homeruns.

F. Type HCFC Luminary cable shall be UL listed, 600 V, 90°C rated, flexible metal encased multi-conductor assembly; with cable sheath of interlocked aluminum strip with green stripe, copper conductors with Code gauge THHN/THWN (Power and Neutral) TFN (Control) insulation, and two grounding means - combined armor and full-sized aluminum ground/bond and full-Sized green insulated copper grounding conductor: Acceptable equivalent to AFC Type MC Luminary HCF-LITE. Connectors and fittings shall be galvanized steel, threaded box connectors, listed for MC cable use. Use of “MCAP” (all-purpose) cable with built-in armor ground and internal un-insulated grounding conductor is NOT acceptable.

2.8 SPLICES

A. Splices for #10 or smaller wires shall be made with UL approved solderless connectors: spring type acceptable equivalent to Minnesota Mining and Manufacturing Company "Scotchlock"; or crimp-type acceptable equivalent to Thomas & Betts "Sta-Kon".

B. Splices, cable taps and terminals for #8 and larger shall be made with UL approved compression connectors: compression taps acceptable equivalent to Thomas & Betts "Colored Keyed" "C" taps applied with special tools according to manufacturer's recommendations; or bolted pressure connectors, bronze or copper construction, by Thomas & Betts, Burndy or acceptable equivalent.

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2.9 APPLICATIONS – CONDUIT, CABLES, RACEWAYS

A. RMC: buried in floor slabs, in concrete walls, concealed in exterior masonry walls, wiring in fire pump rooms, hazardous locations, applications above 600 V.

B. IMC: where noted on drawings.

C. EMT: unless otherwise noted:

1. Feeders

2. Power wiring in mechanical rooms

3. Low voltage wiring in mechanical rooms

4. Wiring for fire alarm systems

5. Wiring for emergency and exit lighting

6. Wiring for emergency communication, security and alarm systems

7. Branch circuits

8. Control wiring, including work done under Division 23

9. Wiring above non-accessible ceilings

10. Light fixture branch wiring

D. LFMC: final connections to motors and equipment-mounted controls from minimum of 18” to maximum of 6 feet lengths.

E. FMC: light fixture whips above accessible ceilings, except not in damp or wet locations and limited to maximum lengths of 6 feet.

F. NMC: sleeves through interior walls, below slab-on-grade, electrical ductbanks, and below grade unless otherwise noted.

G. MC Cable: Galvanized steel jacket cable only, aluminum jacket will not be accepted.

1. Light fixture whips above accessible ceilings, except not in damp or wet locations and limited to maximum lengths of 6 feet. Leave sufficient slack for future removal or servicing of fixtures in finished ceiling.

2. MC Cable shall not be used in wiring of Life Safety or Critical circuits.

H. MC Cable: Galvanized steel jacket.

1. Light fixture whips above accessible ceilings, except not in damp or wet locations and limited to maximum lengths of 6 feet. Leave sufficient slack for future removal or servicing of fixtures in finished ceiling.

2. MC cable in interior walls constructed of metal studs and gypsum wall board.

3. Where MC cable is allowed, EMT shall be installed from electrical panels to a collector box and from the collector box to the first device in each circuit

4. Self-grounding type MC cables assemblies shall NOT be used.

5. Provide with a separate dedicated insulated ground wire, AFC Type MC/IG or equal where an isolated, redundant, or dedicated ground is required.

6. Record the location of all junction boxes feeding wall devices on the as-built drawings.

7. MC Cable shall not be used in wiring of Life Safety or Critical circuits.

8. MC-FPLP cable may only be used in wiring of the fire alarm system when specified as allowed elsewhere in this specification.

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I. HCFC cable: light fixture whips above accessible ceilings, except not in damp or wet locations and limited to maximum lengths of 6 feet. Leave sufficient slack for future removal or servicing of fixtures in finished ceiling.

1. HCFC Cable shall not be used in wiring of Life Safety or Critical circuits.

J. HCFC Cable: Galvanized steel jacket cable only, aluminum jacket will not be accepted.

1. Light fixture whips above accessible ceilings, except not in damp or wet locations and limited to maximum lengths of 6 feet. Leave sufficient slack for future removal or servicing of fixtures in finished ceiling.

2. HCFC cable in interior walls constructed of metal studs and gypsum wall board.

3. Where HCFC cable is allowed, EMT shall be installed from electrical panels to a collector box and from the collector box to the first device in each circuit.

4. Self-grounding HCF-MC cable Assemblies shall NOT be used.

5. Provide with a separate dedicated insulated ground wire, AFC Type MC/IG or equal where an isolated, redundant, or dedicated ground is required.

6. Record the location of all junction boxes feeding wall devices on the as-built drawings.

7. HCFC Cable shall not be used in wiring of Life Safety or Critical circuits.

K. MC Luminary Cable: Galvanized steel jacket cable only, aluminum jacket will not be accepted.

1. Light fixture wiring with integral control wiring, except not in damp or wet locations.

Leave sufficient slack for future removal or servicing of fixtures in finished ceiling.

2. MC Luminary Cable shall not be used in wiring of Life Safety or Critical circuits.

L. HCFC Luminary Cable: Galvanized steel jacket cable only, aluminum jacket will not be accepted.

1. Light fixture wiring with integral control wiring, except not in damp or wet locations.

Leave sufficient slack for future removal or servicing of fixtures in finished ceiling.

2. HCFC Luminary Cable shall not be used in wiring of Life Safety or Critical circuits.

Surface raceways and cable tray: as shown on Contract Drawings.

M. In any case not specifically covered, rigid conduit shall be used unless otherwise approved by Architect.

N. EMT is NOT permitted as a substitute for rigid conduit; MC is NOT permitted as a substitute for flexible metal conduit.

O. AC (BX) cable shall NOT be used.

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2.10 LOW VOLTAGE CABLE SUPPORTS

A. Provide products meeting the requirements of the Drawings and Specifications from one of the following manufacturers:

D-Rings (for wall mounting) Caddy, Minerallac, AT&T, Diamond, Chatsworth, Harrison/Dracon, B-Line, Nelson, Mono-System

J-Hooks (wide base, Cat. 5) Caddy “Cable Cat” or equivalent by Chatsworth, Harrison/Dracon, B-Line, Nelson, Mono-System

Adjustable Cable Support Caddy “Cable Cat” or approved equal Hood and Loop Fasteners Chatsworth, Ortronics, Siemon or approval equal Beam Clamps Caddy, Burndy, Minerallac, Kindroff, Steel City, OZ/Gedney or equal Split Mesh Strain Reliefs (Kellums) Hubbell, Woodhead

B. D-rings and J-hooks shall be sized to correctly support the number of cables which pass through them. Under no circumstances shall cable quantity exceed 30 in any given support. D-rings and J-hooks shall have a maximum of 40 percent fill capacity. Install additional supports as required to not stress cables or derate performance.

C. Hook and loop fasteners shall be designed for their specific application. For example, if a hook and loop fastener issued to support cables to a rack, it shall have a grommeted opening for use with a 12-24 rack mounting screw.

D. Cable-ties are specifically prohibited except for plenum rated cable-ties in plenum areas where hook and loop fasteners are not NRTL listed for plenum use. Install cable ties loose so as to not distort cables or alter performance.

E. Beam clamps shall be steel with threaded bolt type closure. Spring steel or “quick-clip” type clamps are specifically prohibited.

F. Split mesh strain reliefs shall be properly sized for each cable that they support. Only one cable shall be installed in each split mesh strain relief.

G. No supports shall be attached to ceiling grid.

2.11 SAFETY SWITCHES AND FUSES

A. Work of this Division shall include:

1. Furnishing and installing an appropriate fusible safety switch for each motor, unless otherwise noted.

2. Installation of safety switches furnished under DIVISION 23, MECHANICAL WORK.

3. Fuses for safety switches.

4. Power wiring to and from safety switches.

B. Disconnect Switches for Motor Starters

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1. Provide disconnect switch ahead of each magnetic motor starter. The disconnect switch shall be located in sight of the controller location and not more than 50' apart.

2. Where more than one motor is connected to single branch feeder, provide fused disconnect switch for each motor, even if within sight of feeder branch breaker.

3. Motors requiring disconnecting means remote from the starter shall have a fused switch as close as possible to motor.

C. Safety switches shall have rejection clips for RK fuses and NEMA 1 enclosure, unless otherwise noted. Safety switches shall be NEMA Type HD (heavy-duty), manufacturer's specification grade switches by Square D, General Electric, or Westinghouse, acceptable equivalent to following:

1. Switches for use on 120/208 V system: rated for 240 V.

2. Switches for use on 480 V system: rated for 600 V.

3. Fused disconnect 2-pole and 3-pole: Square D "Type H".

4. Switches that are used in conjunction with variable frequency drives (VFDs) and elevators shall have auxiliary contacts that open before switch blades to interrupt control circuits. Auxiliary contacts shall be 120 VAC; 5 Ampere rated.

5. Switches for use with 6 lead motors: 600 VAC, NEMA 4X enclosure.

a. Fused: Square “D” Type H

D. Fuses for safety switches shall be non-renewable dual element cartridge type, Class RK5, UL listed. Fuses shall be Bussmann #FRN for 208 V usage, and Bussmann #FRS for 460 V usage;

or acceptable equivalent by Shawmut or Littelfuse. Install fuse so that size is readily visible.

Special types and classes are indicated on Contract Drawings.

E. Provide one spare set of fuses for each type and size used with switches and other equipment.

2.12 TERMINAL STRIPS

A. Terminal strips shall be Buchanan or acceptable equivalent, with a numbering strip for identification of individual punchings.

PART 3 - EXECUTION

3.1 SUPERVISION

A. Furnish services of experienced electrical Superintendent who shall be constantly in charge of electrical work, together with skilled laborers required to unload, transfer, erect, connect, adjust, start, operate and test each system.

B. Particular emphasis is placed on timely installation of major apparatus and furnishing of other trades and Contractor with relevant information.

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3.2 MOTOR AND CONTROL CIRCUIT WIRING

A. Provide wiring required for electrical equipment furnished under other Divisions of this Specification. Provide disconnects, starting switches and motor protection ahead of each piece of equipment, unless specified otherwise.

B. Check all protective and control equipment furnished or installed under this Division. Ensure that such equipment is properly sized for motor or other electrical equipment that it serves.

Replace any material or equipment damaged due to improperly-sized protective control mechanisms.

C. Electrical controls and starters integral with or specialized for mechanical equipment may be specified with equipment in other DIVISIONS. Disconnects and other controls and starters are specified in this Division.

D. Output power wiring from variable frequency drive (VFD) to motor shall be run in metallic conduit; other wiring shall NOT be run in this conduit. VFD shall have separate equipment conductor back to ground bus of source panel or switchboard and shall NOT depend on metallic conduit for grounding. Power shall NOT be applied to VFD until VFD manufacturer has checked and approved VFD installation.

E. Control cable to VFD speed input shall be shielded and shall be installed without excess cable so that electrical noise shall be minimized.

F. Provide pair of control cable from auxiliary contacts of safety switch between VFD and motor to the VFD to interrupt control circuits. Control cable shall be minimum #14, 300 volt.

3.3 IDENTIFICATION

A. Provide nameplates and general identification as required under SECTION 260500, COMMON WORK RESULTS FOR ELECTRICAL, and under DIVISION 1, and as follows:

1. Manufacturer's nameplate, name, trademark and address shall be attached permanently to equipment and material furnished under this division. Nameplate showing distributor or contractor will not be permitted.

2. Equipment designation nameplates shall be engraved lamicoid, sized as follows:

a. Nameplates on panelboards, distribution panels and service switches: minimum of 1-1/2” by 2-1/2” size with letters not less than 3/8” high.

b. Nameplates on starters and other switches and devices: minimum of 3/4” by 2- 1/2” size with letters not less than 1/4” high.

3. Each element of emergency, legally required, standby and normal power systems shall be identified using the following background and letter colors:

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Emergency/Legally Required/Standby Systems: Red background

White lettering

Normal Systems: Black background

B. Provide printed, colored, adhesive labels for all electrical equipment, such as but not limited to switchboards, panelboards, motor control centers, disconnect switches, meter socket enclosures, etc. to warn qualified personnel of potential electric arc flash hazards. Label shall be a minimum of 4” x 5”, conforming to requirements of the current Edition of NFPA 70E and requirements of OSHA.

C. Wall plates provided for flush-mounted control switches in finished areas shall be engraved, stainless steel with black-filled letters.

D. Conductors size #6 and smaller shall have solid color insulation for identification.

E. Conductors size #4 and larger shall have color identification, six inches minimum length near termination and in splice boxes, junction boxes, panels and manholes. Identification shall be by solid color insulation, tape or paint.

F. Label 5 kv and 15 kv systems similar to the above.

G. Phase rotation shall be indicated by following color code:

Phase 5 KV and 208Y/120V 15 KV and 480Y/277V

A Black Brown B Red Orange C Blue Yellow Neutral White White with purple stripe or natural gray Ground Green Green

H. 480V raceways including pull boxes and junction boxes shall have orange adhesive tape strips with pre-printed legend "480 Volts" affixed near terminations and at 25’ intervals. Preprinted tape shall be by Seton Nameplate, W.H.Brady or acceptable equivalent.

I. Conduits containing emergency feeders* shall be identified by attaching red adhesive tape with black letters stating "EMERGENCY POWER" at 25’ intervals.

J. Provide red with white lettering lamicoid label on cover of motor starter enclosure, adjacent to H-O-A switch, to read:

WARNING-

In hand position, all control interlocks are bypassed

USE FOR CAUTIOUS TESTING ONLY

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K. Where wall plates are provided for control switches flush mounted in finished areas, plates shall be engraved, stainless steel with black-filled letters.

3.4 IDENTIFICATION

A. Distribution Equipment

1. All distribution equipment and associated electrical elements of mechanical equipment shall be identified according to the designations used in the Contract Documents or established in cooperation with the Owner/Architect as part of the as-built record drawings. Furnish directory indicating number, location and use of each item.

Equipment requiring such numbering includes, but is not limited to the following:

a. High voltage switches and equipment

b. Substations

c. Switchboards/switchgear

d. Switchboard/switchgear individual overcurrent protection devices

e. Motor control centers

f. Motor control center individual motor starter devices

g. Overcurrent protection device enclosures

h. Transfer switches

i. Bypass isolation switches

j. Disconnect switches

k. Panelboards

l. Transformers

m. Equipment control panels and enclosures

n. Special systems, fire alarm and communication terminal cabinets and enclosures

(indicate building floor and location on nameplate).

2. Nameplates/Labeling: Center on device, coverplate or enclosure. Place on non-removable surface.

a. Use abbreviations defined in the contract documents whenever possible. Use plan designations for labeling, unless indicated otherwise. Indicate loads served using designating from electrical schedules and designations from the trade furnishing the equipment served.

b. Label the following with engraved lamicoid nameplates:

c. Install nameplates inside covers in finished areas and outside covers in unfinished areas including mechanical, electrical and building maintenance areas.

3. Manufacturer's nameplate, name, trademark and address shall be attached permanently to equipment and material furnished under this division. Nameplate showing distributor or contractor will not be permitted.

4. Equipment designation nameplates shall be engraved lamicoid, sized as follows:

a. Nameplates on panelboards, distribution panels and service switches: minimum of 1-1/2" by 2-1/2" size with name letters not less than 1/2" high and voltage, phase and number of wires not less than 1/4" high.

BASIC MATERIALS & METHODS – ELECTRICAL 260515 - 15

b. Nameplates on starters and other equipment switches and devices: minimum of 3/4" by 2-1/2" size with letters not less than 3/8" high.

5. Each element of both essential and normal power systems shall be identified using the following background and letter colors:

Essential Systems: Red background

6. Attach nameplates with rivets. Wherever covers of adjacent units are interchangeable, attach additional nameplates to wall or backboard adjacent to covers.

7. Essential power system equipment shall be identified indicating the associated essential power system branches as follows:

Essential - Life Safety Essential - Critical Essential - Equipment

a. See typical label details for additional information.

8. Panelboard circuit identification: engraved plastic nameplates for units without panel cover doors, or plastic covered circuit directory cards, type written, mounted on the inside of the panel cover doors.

9. Acceptable manufacturers for nameplates are Lamicoid, Seton or Brady.

B. Provide printed, colored, adhesive labels for all electrical equipment, such as but not limited to switchboards, panelboards, motor control centers, disconnect switches, meter socket enclosures, etc. to warn qualified personnel of potential electric arc flash hazards. Label shall be a minimum of 4” x 5”, conforming to requirements of the 2015 Edition of NFPA 70E and requirements of OSHA.

C. Distribution Raceway Systems

1. Distribution raceway systems shall require system identification and shall include, but is not limited to the following:

a. Conduit systems

b. Pull boxes and junction boxes

2. Marker pen labeling shall be utilized on conduit and cable system junction boxes.

Marker pen labeling methods shall be submitted for review prior to execution. Spray painting shall not be permitted. Systems requiring such identification include and shall be limited to the following:

a. Junction boxes or portions of junction boxes containing 277/480 Volt or 120/208 Volt wiring.

b. Communication and special system pull and junction boxes

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c. Pull boxes and junction boxes installed for future use.

3. Marker pen labeling shall be on outside of junction and pull box coverplates and on the box itself in unfinished areas including mechanical, electrical and building maintenance areas and inside covers in finished areas.

4. Marking pen where used shall be permanent, waterproof and quick drying.

5. Conduits contain essential power system feeders and branch circuits shall be identified by attaching red vinyl adhesive backed decal with 1/2” high black letters on 1" high labels identifying essential power within 1'-0" of each termination or pull box and a minimum of every 25 feet of conduit run. Referenced labels shall be by Seton.

6. 2-hour rated cable shall be identified by same method as essential power system feeders.

7. Essential power systems feeders and branch circuit conduits shall be identified indicating the associated essential power system branch as follows:

a. Critical

b. Life Safety

c. Equipment

8. Acceptable manufactures for underground warning tape, identification decals and vinyl adhesive backed labels are Seton or Brady.

9. Fire alarm system, junction boxes and recovery couplings shall be painted red. Provide vinyl label indicating fire alarm every 25 feet and at terminations.

D. Conductor and Cabling Systems:

1. Conductors size #6 and smaller shall have solid color insulation for identification.

2. Conductors size #4 and larger shall have color identification, six inches minimum length near termination and in splice boxes, junction boxes, panels and manholes. Identification shall be by solid color insulation, tape or paint.

3. Label tapes: Use for feeder, branch circuit control and special system conductors throughout. Indicate feeder and branch circuit numbers on both feeders and branch circuit conductors and terminal block termination numbers for control and special system conductors. Label conductors at origin and destination points and at all junction boxes, pull boxes and cable branch off points where installed in cable trough, wireway, monotray, cable ladder, etc.

4. Label 5 kv and 15 kv systems similar to the above.

E. Phase rotation shall be indicated by following color code:

Phase 5 KV and 208Y/120V 15 KV and 480Y/277V

A Black Brown B Red Orange C Blue Yellow Neutral White White with color stripe or natural gray Ground Green Green

F. 480V raceways including pull boxes and junction boxes shall have orange adhesive tape strips with pre-printed legend "480 Volts" affixed near terminations and at 25’ intervals. Preprinted tape shall be by Seton Nameplate, W.H.Brady or acceptable equivalent.

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G. All neutral conductors shall be identified with their associated phase conductors at all boxes and panelboards as follows:

1. Branch circuit wiring in trench headers, panelboard enclosures, termination boxes, junction boxes, pull boxes, etc., shall be bundled together into individual circuits. Each bundled circuit shall consist of 1, 2 or 3 phase conductors and associated neutral conductor. Branch circuit wiring shall be installed with bundled circuits identified by circuit numbers. Bunching of individual branch circuits shall be done with nylon straps made of self-extinguishing nylon with a locking hub or head on one end and a taper on the other end. Nylon straps shall be type Thomas and Betts "TY-RAP" or acceptable equivalent.

H. Devices

1. Device plates for light switches, receptacles and miscellaneous other devices connected to essential branches of the distribution system shall be stainless steel unless otherwise noted. The required red color coding shall be integral within the device itself.

2. Device plates for medical and housekeeping receptacles, light switches and miscellaneous other devices connected to the "normal branches" of the distribution system shall be stainless steel unless otherwise noted.

3. Wall plates provided for flush-mounted control switches in finished areas, excluding light switches, shall be engraved, stainless steel with black-filled letters. Device switches shall be color coded according to essential or normal power systems, as identified in other sections of this specification.

4. Label all electrical outlets including electrical outlets furnished as an integral part of furniture and fittings with supply panel and circuit breaker designation, both on cover and tag wiring inside box. In general identification label shall be affixed to outside of cover plate. Label shall be engraved lamicoid.

5. Each device element in the essential (emergency) and in the normal power systems shall be identified using the following background and letter colors:

Essential Emergency Systems: Red background

White letting

6. Engrave nameplates of receptacles wired to GFI breakers to read “GFI” adjacent to or above receptacle opening.

7. Engraved letter characters for device outlet labels shall be a minimum of 3/16" high.

8. Attached device nameplates with rivets only, adhesive backed labels are not permitted.

9. Acceptable Manufacturers: Nameplates, wall plates and conductor tape within device back box: Seton, Brady.

10. Low Voltage Cabling Systems Color Code

a. Cable jacket colors and labeling for the following systems shall be the following standards:

1) Intercom - Brown

2) Fire Alarm - Red

3) Fiber Optics - Orange

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4) Nurse Call - Yellow

5) Data cable/matching icon - Green

6) Patient monitoring cable/matching icon - Violet

7) Telephone cabling - White

8) Telephone icon -Yellow

9) Main Frames - Black or Orange

b. Where the above systems are installed in dedicated raceways color the junction boxes and conduit couplings to match the cable jacket color. Provide identification of system on each junction box. In lieu of painting the conduits provide adhesive labels with 1/2” lettering every 10 feet identifying the system cabling type installed within.

3.5 INSTALLATION OF CONDUIT, BOXES AND FITTINGS

A. Ends of conduits shall be reamed before assembly, and bushings and locknuts shall be provided where conduits connect to boxes.

B. Boxes shall be set plumb and square with building lines. Exposed conduit shall run parallel to building lines, unless noted otherwise, and shall NOT block ceiling inserts.

C. Maintain conduit and outlet boxes in position during construction of concrete floors, masonry walls, etc.

D. Wiring device boxes shall NOT be installed back-to-back in walls.

E. Conduit shall run to avoid low pockets which might collect water, and, during installation, open ends shall be capped.

F. Piping, ductwork, and conduit shall NOT be suspended and/or supported from one another and shall NOT physically contact one another under any circumstances. Provide independent support for electrical systems. Vibrating systems shall be kept free from non-vibrating systems.

G. RMC or IMC buried in grade or in ductbanks shall have couplings made up tight. Thread to coupling joint shall be coated heavily with bitumastic paint, ensuring watertightness.

H. Parallel groups of conduit shall be supported from below, either by horizontal angle irons or channel systems such as "Unistrut", with vertical hanger rods at appropriate intervals.

I. Supports for conduit on concrete walls shall be attached to wall with all metal expansion shields.

J. Installation of conduit on rooftops is not permitted except as shown on drawings or as required to serve rooftop equipment. Provide rubber pipe supports as follows:

1. Install in accordance with manufacturer's instructions and recommendations.

2. If gravel top roof, gravel must be removed around and under pipe support.

3. Always consult roofing manufacturer for roof membrane compression capacities. If necessary, a compatible sheet of roofing material (rubber pad) may be installed under rooftop support to disperse concentrated loads and add further membrane protection.

BASIC MATERIALS & METHODS – ELECTRICAL 260515 - 19

4. Use properly sized clamps to suit conduit sizes.

K. Conduits in slabs or in grade shall be swabbed internally prior to pulling wire or cable.

L. Final connections to motors, control devices mounted on equipment, vibrating equipment and vibration isolated equipment shall be made through liquid-tight flexible metal conduit.

M. Use standard radius bends on concealed conduit; on exposed work, use either standard bends or "L" type fittings acceptable equivalent to Crouse-Hinds.

N. Wherever MC cable is used, leave sufficient slack for future removal or withdrawal of boxes or fixtures from finished ceiling or partitions. All cables shall be rigidly supported from the building structure using products listed and identified for securement and support at least 4' O.C. and within 12" from every fitting and shall run in lines parallel or perpendicular to building structural members. Cable shall not rest on the ceiling structure.

O. Wherever HCFC cable is used, leave sufficient slack for removal or withdrawal of boxes or fixtures from finished ceiling or partitions. All cables shall be rigidly supported from the building structure using products listed and identified for securement and support at least 4' O.C. and within 12" from every fitting and shall run in lines parallel or perpendicular to building structural members. Cable shall not rest on the ceiling structure.

P. Exposed wiring shall be kept as close as possible to underside of roof and floor slabs or bottom of beams, unless noted otherwise. Space above hung ceilings is extremely critical and coordination with mechanical trades is essential.

Q. Conduit and wiring shall NOT be run in roof fill and shall NOT pierce roof deck, unless specifically noted to on Contract Drawings.

R. Galvanized electrical conduit of 1/2” nominal diameter may be embedded within 4-1/2” overall thickness suspended concrete slabs over permanent metal floor forms; galvanized electrical conduit of 1” nominal diameter may be embedded within slabs of 6” thickness overall.

S. Conduits concealed in or beneath slab on grade: Conduits larger than 3/4” nominal diameter shall be completely buried below vapor barrier within the porous fill layer, such that surface of vapor barrier is smooth and level within ±1/4” tolerance. Conduits 3/4” and smaller may be:

1. Completely buried below the vapor barrier within the porous fill, or

2. Placed above the vapor barrier, within the slab, at mid-height of slab, or

3. If within the slab, spaced minimum of 3 diameters away from parallel conduits.

T. Additional Requirements for Low Voltage Systems: refer to Section 260525.

U. Field cut IMC and RMC conduits shall be field threaded. Field threads to be cold galvanized by brush or spray. Cold galvanize to be minimum 95% zinc and shall cure before attaching to threaded fitting. Set screw and compression fittings shall not be acceptable.

V. Conduit shall not be run directly above generator set exhaust system including piping, silencer, emission control equipment, heat recovery exchangers or any other equipment that contains hot exhaust gases.

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W. Where PVC conduit, whether direct buried or in ductbank, terminates within a building or utility structure, the PVC conduit shall transition to rigid metal conduit at least 10 feet prior to entering building or utility structure. Additionally, sweeps up through slabs on grade shall be

RMC.

X. Seal all conduits at the last structure prior to conduits entering a building and where conduits enter a building with Carlon “MAT” or “MAQ” series duct plug for conduits with wires and Carlon “MAE” series for spare conduits or equal. All spare conduits shall have nylon pull string and footage tape. Provide brass tag at each end of conduit indicating other end locations and overall footage of conduit.

Y. Adjacent poke-thru devices shall not be located closer than 24 inches on center.

Z. No more than one poke-thru device shall be provided per 65 square feet of floor area in each span per UL Fire Resistance Directory.

3.6 INSTALLATION OF CABLES

A. Parallel groups of cables shall be supported from below, either by horizontal angle irons or channel systems such as “Unistrut”, with vertical hanger rods at maximum of three-foot intervals.

B. Supports for cables on concrete walls shall be attached to wall with all metal expansion shields.

C. All insulated conductors run in plenum spaces shall be plenum rated and carry UL listing for flame spread and smoke propagation.

3.7 INSTALLATION OF BACKBOARDS AND EQUIPMENT CABINETS

A. Backboards shall be installed over sheetrock, screwed into wall studs or with screw anchors in masonry walls. Bottom of backboard shall be set at 6” AFF, extending to a maximum of 8’6”

AFF.

B. Equipment shall be mounted to backboards at minimum of 4 points, with screws and washers.

C. Freestanding Unistrut framing for mounting of backboards or equipment cabinets shall be secured to floor and structure above.

3.8 BRANCH CIRCUIT WIRING

A. Multiple branch circuits within a single enclosure (junction box, pull box, panel board) must have individual neutrals and grounding conductors identified or tie-wrap to line conductors of same circuit.

B. Parallel conductors shall be installed in groups consisting of not more than one conductor per phase, neutral and grounding conductor to prevent current imbalance.

BASIC MATERIALS & METHODS – ELECTRICAL 260515 - 21

3.9 MOTOR CONTROL

A. Mount grouped switches, starters and other equipment on backboards. See Paragraph BACKBOARDS & EQUIPMENT CABINETS in this section. Where wall space is not adjacent to equipment being served, or where additional wall space is required, provide free-standing assembly, constructed of metal uni-strut or similar, for mounting of equipment.

END OF SECTION