B09_Amd_02_Attach_08_26_28_00_Overcurrent_and_Short_Circuit_Protective_Devices_Rev_1_0002.pdf

10350902 National Park Service Replace Obsolete Stehekin Wastewater Treatment Plant - 100% Complete Contract Documents

OVERCURRENT AND SHORT CIRCUIT PROTECTIVE DEVICES

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SECTION 26 28 00

OVERCURRENT AND SHORT CIRCUIT PROTECTIVE DEVICES

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Low voltage circuit breakers.

2. Low voltage fuses.

B. Related Specification Sections include but are not necessarily limited to:

1. Section 26 05 00 - Electrical - Basic Requirements.

2. Section 26 08 13 - Acceptance Testing.

3. Section 26 09 13 – Electrical Metering Devices

1.2 QUALITY ASSURANCE

A. Referenced Standards:

1. Institute of Electrical and Electronics Engineers, Inc. (IEEE):

a. C37.13, Standard for Low-Voltage AC Power Circuit Breakers Used in Enclosures.

b. C37.16, Low-Voltage Power Circuit Breakers and AC Power Circuit Protectors -

Preferred Ratings, Related Requirements, and Application Recommendations.

c. C37.17, Trip Devices for AC and General Purpose DC Low Voltage Power Circuit

Breakers.

2. National Fire Protection Association (NFPA):

a. 70, National Electrical Code (NEC).

3. Underwriters Laboratories, Inc. (UL):

a. 248-1, Low-Voltage Fuses - Part 1: General Requirements.

b. 248-8, Low-Voltage Fuses - Part 8: Class J Fuses.

c. 489, Standard for Safety Molded-Case Circuit Breakers, Molded-Case Switches, and

Circuit-Breaker Enclosures.

d. 943, Standard for Safety for Ground-Fault Circuit-Interrupters.

e. 1066, Standard for Low-Voltage AC and DC Power Circuit Breakers Used in

Enclosures.

1.3 SUBMITTALS

A. Shop Drawings:

1. Product technical data including:

a. Provide submittal data for all products specified in PART 2 of this Specification Section.

b. See Specification Section 26 05 00 for additional requirements.

2. Fabrication and/or layout drawings.

3. Control wiring diagram and programing for load shedding.

B. Contract Closeout Information:

1. Operation and Maintenance Data:

a. See Specification Section 01 78 23 for requirements for the mechanics, administration, and the content of Operation and Maintenance Manual submittals.

C. Informational Submittals:

1. Reports:

a. As-left condition of all circuit breakers that have adjustable settings.

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PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Subject to compliance with the Contract Documents, the following manufacturers are acceptable:

1. Circuit breakers:

a. Eaton.

b. GE by ABB.

c. Square D Company.

d. Siemens.

2. Fuses:

a. Eaton Bussmann, Inc.

b. Littelfuse, Inc.

c. Mersen

2.2 CIRCUIT BREAKERS

A. Molded Case Type:

1. General:

a. Standards: UL 489.

b. Unit construction.

c. Over-center, toggle handle operated.

d. Quick-make, quick-break, independent of toggle handle operation.

e. Manual and automatic operation.

f. All poles open and close simultaneously.

g. Three position handle: On, off and tripped.

h. Molded-in ON and OFF markings on breaker cover.

i. One-, two- or three-pole as indicated on the Drawings.

j. Current and interrupting ratings as indicated on the Drawings.

2. Remotely operated breakers:

a. Basis of design for remotely operated breakers Square D. Solutions by other manufactures listed in Part 1 are acceptable:

1) Powerlink ECB-G3 Breakers

2) NF-G3 POWERLINK control busses attached to interior rails in a panelboard

3) POWERLINK G3 power supply

4) Modem Kit 6382G3MODEM for use with POWERLINK G3 Controllers

b. Title 24 and ASHRAE 90.1 compliant.

c. Remotely monitor and control circuits.

d. Ability to control breakers remotely – ON, OFF

e. Integral branch circuit overcurrent protection as required by the NEC. Circuit breakers shall have a UL-listed interrupting rating sufficient for the application or UL-listed series connected ratings for the maximum available fault current at that point in the system. Submittals reflecting the use of relays or contactors to perform remote switching shall show evidence in writing that the relays or contactors are listed to withstand the available fault current.

f. UL-listed SWD ratings for 15 ampere, 20 ampere, and 30 ampere 1-pole, 2-pole, and 3-pole branch devices, HID ratings, and HACR ratings.

g. Handle operator that shall mechanically open the power switching device contacts when moved to the OFF position and disable the contacts from being remotely closed.

Handle operator shall accept field-installable handle tie to allow application where a handle tie is required by the NEC.

h. Manual override switch to enable or disable the remote operation of the device and allow circuit breaker handle to fully control the on/off state of the circuit breaker.

Override shall fully disengage remote operation of the circuit breaker mechanism.

Device utilizing one-shot or temporary overrides shall not be accepted.

i. Visible flag that clearly indicates the status of the circuit breaker contacts with the panel trim installed. Flag shall indicate ON, OFF, and TRIPPED circuit breaker states. The

OVERCURRENT AND SHORT CIRCUIT PROTECTIVE DEVICES

26 28 00 - 3 visible flag shall be mechanical in nature, directly tied to the circuit breaker mechanism, and shall be provided in addition to any status indicator supplied by the system electronics.

j. Voltage status signal to indicate the presence or absence of voltage at the load terminal as a true indication of the on/off status of the connected circuit to aid in identifying wiring errors, such as a back-feed or disconnected neutral conductor.

k. Circuit to indicate the number of poles of the remotely operable circuit breaker.

l. Integral control connector to simplify and speed installation and eliminate wiring errors such that the control connection is made automatically when installing the breaker in the panelboard. Connection to the breaker shall not introduce control wiring into the panelboard gutter space. Control connections shall be rated NEC Class 1 to eliminate the requirement for barriers in the gutter space such that control connections may reside with electrical power circuit conductors.

m. Switching full load endurance rating of 200,000 open/close/open remote operations.

3. Thermal magnetic type:

a. Inverse time overload and instantaneous short circuit protection by means of a thermal magnetic element.

b. Frame size 150 amp and below:

1) Non-interchangeable, non-adjustable thermal magnetic trip units.

c. Ground Fault Circuit Interrupter (GFCI) Listed:

1) Standard: UL 943.

2) One- or two-pole as indicated on the Drawings.

3) Class A ground fault circuit.

4) Trip on 5 mA ground fault (4-6 mA range).

d. Switching Duty (SWD) Listed:

1) 15 and 20 amp rated at 347 V and less.

2) Suitable for switching loads on a regular basis

e. Title 24 and ASHRAE 90.1 compliant.

f. Remotely monitor and control circuits.

g. Ability to control breakers remotely – ON, OFF

4. Motor circuit protector:

a. Adjustable instantaneous short circuit protection by means of a magnetic or solid state trip element.

b. Sized for the connected motor.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Current and interrupting ratings as indicated on the Drawings.

B. Series rated systems not acceptable.

C. Devices shall be ambient temperature compensated.

D. Circuit Breakers:

1. Molded case circuit breakers shall incorporate the following, unless indicated otherwise on the Drawings:

a. Frame sizes 400 amp and less with trip setting less than 400A shall be thermal magnetic type.

b. Motor circuit protectors sized for the connected motor.

2. Insulated case circuit breakers shall incorporate the following, unless indicated otherwise on the Drawings:

a. Set current sensor or rating plugs long time pick-up setting so that the indicated trip level is near the 75% trip point.

E. Fuses:

1. UL Class RK-1 (fast acting): Use where indicated.

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2. UL Class RK-1 (dual element): Use for motor feeder and branch circuit devices.

3. UL Class RK-5: Use for motor feeder and branch circuit devices.

3.2 FIELD QUALITY CONTROL

A. Testing:

1. Acceptance testing: See Specification Section 26 08 13.

2. Remotely Operated Circuit Breakers:

a. Testing automatic load shedding operation.

b. Testing automatic reclosing operation.

END OF SECTION