final 26 28 13 Fuses.pdf

OFFUTT AIR FORCE BASE

(092036) 26 26 13-1 (Repair AHU O-Club, B462)

2010 by FEI

SECTION 26 28 13

FUSES

PART 1 - GENERAL

1.1 SUMMARY

A. Extent of fuse work is indicated by drawings and schedules.

B. Types of fuses specified in this section include the following:

1. Class RK1 time-delay.

PART 2 - PRODUCTS

2.1 ACCEPTABLE MANUFACTURERS

A. Manufacturer: Subject to compliance with requirements, provide products of one (1) of the following:

1. Bussman Div; McGraw-Edison Co.

2. Littelfuse Co.

3. Gould Shawmut.

B. Fuse types listed below are for Bussman Co. Fuses by Littelfuse Co. or Gould Shawmut shall be equivalent to types indicated.

2.2 FUSES

A. General: Except as otherwise indicated, provide fuses of types, sizes, ratings, and average time/current and peak let-through current characteristics indicated, which comply with manufacturer's standard design, materials and construction in accordance with published product information, and with industry standards and configurations.

B. Class RK1 Time-Delay Fuses: Provide UL Class RK1 time-delay fuses rated 250V (Type LPN-RK) for voltages under 250V and 600V (Type LPS-RK) for voltages 250-600V, 60 Hz, with 200,000 RMS symmetrical interrupting current rating.

PART 3 - EXECUTION

3.1 INSTALLATION OF FUSES

A. Install fuses as indicated, in accordance with the manufacturer's written instructions and with recognized industry practices to ensure that protective devices comply with requirements. Comply with

NEC and NEMA Standards for installation of fuses.

B. Coordinate with other work, including electrical wiring work, as necessary to interface installation of fuses with other work.

C. Install fuses in fused switches.

D. Short-circuit protection dual-element fuses installed in individual motor circuits with separate overload protection shall be sized at 175% of motor nameplate current rating or the next standard

OFFUTT AIR FORCE BASE

(092036) 26 26 13-2 (Repair AHU O-Club, B462)

2010 by FEI fuse size. Where excessive ambient temperature, high inertia motor loads or frequent "on-off" cycling requires larger fuses, consult the electrical engineer. Use fuse reducers where fuse gaps are larger than fuse dimension.

E. All fuse sizes shall be coordinated with manufacturer's requirements for each unit of equipment to be connected.

3.2 FIELD QUALITY CONTROL

A. Prior to energization of fusible devices, test devices for continuity of circuitry and for short-circuits.

Correct malfunctioning units and then demonstrate compliance with requirements.

END OF SECTION