Wright Architects
Job No. 11006 – Schulman Crossing
11-11-13
16475-1
Overcurrent Protection
SECTION 16475
OVERCURRENT PROTECTION
1.00 GENERAL
1.01 Summary:
A. Provide fuses and circuit breakers of ampere rating and U.L. Classification as indicated on the drawings.
1. Section 16050: Electrical General
2. Section 16440: Disconnect Switches
3. Section 16470: Panelboards
1.02 Submittals:
1. Manufacturers: Product Data Sheets
2. Time - Current Characteristic Curves (Average Melt)
PART 2 - PRODUCTS
2.01 Manufacturers:
A. Acceptable Manufacturers - Fuses:
1. Products specified as standard of quality are manufactured by Cooper
Industries, Bussmann Division, referred to as Bussmann.
2. Products of manufacturers listed below meeting indicated standards and specified manufacturer's product data characteristics, except as modified below, are acceptable for use, subject to prior approval of proposed product list.
3. All fuses shall be of the same manufacturer.
B. Acceptable Manufacturers - Circuit Breakers
1. Products specified as standard of quality are manufactured by Square D
Company, referred to as Square D.

Wright Architects
Job No. 11006 – Schulman Crossing
11-11-13
16475-2
Overcurrent Protection
2. Products of manufacturers listed below meeting indicated standards and specified manufacturer's product data characteristics, except as modified below, are acceptable for use, subject to prior approval of proposed product list.
3. Circuit breakers shall be of the same manufacturer as the panelboard or enclosure in which they are installed.
2.02 Fuses:
A. Mains, Feeders and Branch Circuits:
1. Circuits 601 to 6000 amperes shall be protected by current limiting
BUSSMANN LOW-PEAK time-delay fuses KRP-C(amp)SP. Fuses shall employ "0" rings as positive seals between the end bells and the glass melamine fuse barrel. Fuse links shall be pure silver (99.9% pure) to limit the short circuit current let-through values to low levels and comply with
NEC Sections requiring component protection. The terminals shall be peened. Fuses shall be time-delay and shall hold 500% of rated current for a minimum of 4 seconds, clear 20 times rated current in .01 seconds or less and be listed by Underwriters Laboratories Inc. with an interrupting rating of 300,000 amperes RMS symmetrical. The fuses shall be UL
Class L. Fuses shall be "LOW-PEAK YELLOW" in color.
2. Circuits 0 to 600 amperes shall be protected by current limiting
BUSSMANN LOW-PEAK dual-element fuses LPN-RK, LPS-RK, or LPJ.
All dual-element fuses shall have separate overload and short-circuit elements. Fuses shall incorporate a spring activated thermal overload element having a 284 degree Fahrenheit melting point alloy and shall be independent of the short-circuit clearing chamber. The fuse shall hold
500% of rated current for a minimum of 10 seconds (30A, 250V Class
RK1 case size shall be a minimum of 8 seconds at 500% of rated current) and be listed by Underwriters Laboratories, Inc with an interrupting rating of
300,000 amperes RMS symmetrical. The fuses shall be Time-Delay UL
Class RK1 or J to maintain the engineered protection of the system components. Fuses shall be "LOW-PEAK YELLOW" in color.
1. Upon completion of the building, the electrical contractor shall provide the
Owner with spare fuses as shown below: a. 10% (minimum of 3) of each type and rating installed fuses shall be supplied as spares.
2. BUSSMANN spare fuse cabinet - Catalog No. SFC shall be provided to store the above spares. The spare fuse cabinet (SFC) shall include a supply of "LOW-PEAK YELLOW" NOTICE labels.
2.03 Molded Case Circuit Breakers:

Wright Architects
Job No. 11006 – Schulman Crossing
11-11-13
16475-3
Overcurrent Protection
1. Circuit breakers shall be Square D FA, KA, LA, NH, PA and/or PC one, two or three pole molded case circuit breakers rated 15 through 2500 amperes,
120V.ac, 240V.ac, , as specified on the drawings. Breakers shall have an interrupting rating to match the panel in which they are installed or as indicated on the drawings. All circuit breakers shall be UL and CSA listed,
IEC 157-1 rated, meet NEMA Standard AB1-1975 and Federal
Specification W-C-375B/GEN, when applicable. Breakers covered under this specification may be installed in panelboards, switchboards, individual enclosures, motor control centers or,
1. Molded case circuit breakers shall have overcenter toggle-type mechanisms, providing quick-make, quick-break action. Breakers shall be calibrated for operation in an ambient temperature of 40 degrees C. Each circuit breaker shall have trip indication by handle position and shall be tripfree. Two and three pole breakers shall be common trip. Each circuit breaker shall have a permanent trip unit containing individual thermal and magnetic trip elements in each pole. Circuit breakers with frame sizes greater than 100 amperes shall have variable magnetic trip elements which are set by a single adjustment (to assure uniform tripping characteristics in each pole). A push-to-trip button shall be provided on the cover for mechanically tripping the circuit breaker. The circuit breaker shall have reverse connection capability and be suitable for mounting and operating in any position.
1. Circuit breakers shall have removable lugs. Lugs shall be UL listed for copper and aluminum conductors. Breakers shall be UL listed for installation of mechanical type or compression type lugs.
3.00 EXECUTION
3.01 Installation:
A. Install fuses in all switches shown on the plans which require fuses.
B. Fuses shall not be installed in the switch until equipment is ready to be energized.

Wright Architects
Job No. 11006 – Schulman Crossing
11-11-13
16475-4
Overcurrent Protection
C. Install "LOW-PEAK YELLOW" NOTICE labels to alert the end user of the engineered level of protection of the electrical equipment. They shall be marked with the proper fuse rating, per the drawings, and placed in a conspicuous location on the enclosure. These labels are available with the spare fuse cabinet
(SFC) and are also available upon request from Bussmann.
3.02 Installation - Circuit Breakers
A. Install circuit breakers in panelboards, switchboards, distribution panelboards, and enclosures as shown on the drawings.
B. Terminate wiring into circuit breaker lug. Tighten lug to torque level as marked on the lug.
END OF SECTION