Download 26 28 13 Fuses

MPS Master
SECTION 26 28 13
FUSES
PART 1 - GENERAL
1.01
A.
SUMMARY
Section Includes: Fuses, circuit breakers, and accessories to protect the following:
1.
2.
3.
1.02
A.
1.03
A.
Feeders
Motors and Electrical Appliances Required by Drawings and Specifications
Others as Required by National Electric Code
QUALITY ASSURANCE
General:
1.
Meet NEC requirements as applicable to construction and installation of fuses.
2.
Meet applicable requirements of UL 198D, ”High-Interrupting Capacity Class K Fuses“.
Provide fuses that are UL listed.
3.
Meet applicable requirements of ANSI C97.1 pertaining to low voltage cartridge fuses.
SUBMITTALS
General:
1.
Submit manufacturer’s data on fuses, including voltages and current ratings, interrupting
ratings, time-current characteristic curves, and mounting requirements.
2.
Submit layout drawings of fuses showing spatial relationships of units to associated
electrical equipment, and connections to power supplies.
3.
For types and ratings required, furnish additional fuses, amounting to (1) for every (5)
installed, but not less than (1) of each size and type.
PART 2 - PRODUCTS
2.01
A.
FUSE MANUFACTURERS
Acceptable Manufacturers: Subject to compliance with requirements of the Contract
Documents, acceptable manufacturers are as follows:
1.
2.
3.
2.02
A.
Bussman
Littlefuse
Shawmut
FUSE TYPES
600 Ampere and Below:
1.
200,000 amperes RMS interrupting rating.
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MPS Master
SECTION 26 28 13
B.
2.
Underwriters‘ Laboratories Class RK1 current limiting, dual element time delay, rejection
type.
3.
Coordination between an RK1 line-side fuse and an RK1 load-side fuse shall not exceed a
2:1 ratio in accordance with manufacturer's published coordination tables.
4.
250 Volt Fuses: Buss LPN-RK, Littlefuse LLN-RK, or Shawmut A2D.
5.
480 Volt Fuses: Buss LPS-RK, Littlefuse LLS-RK, or Shawmut A6D.
601 Amperes and Above:
1.
200,000 amperes RMS interrupting rating.
2.
Underwriters‘ Laboratories Class L current limiting, time delay, pure silver link type.
3.
Let-through RMS symmetrical amperes shall not exceed the following values for an
available short circuit current of 50,000 amperes.
4.
C.
A.
Let-Through RMS Amperes
800A
17,500
1200A
22,500
1600A
28,500
2000A
32,000
3000A
43,000
Fuses shall be Buss KRP-C, Littlefuse KLP-C, or Shawmut A4BQ.
Single Phase Motor Fuses:
1.
2.03
Fuse Rating
Where plug fuse disconnect switches are used, fuses shall be Bussman Type S or Owner
approved equal of Littlefuse or Shawmut.
CIRCUIT BREAKERS
Selective Coordination: Provide molded case circuit breakers for protection of all electrical
circuits as indicated on Drawings and specified elsewhere herein.
1.
Panelboard and switchboard overcurrent devices shall be coordinated per NEC
requirements. Provide Time-Current Study showing system coordination for each
panelboard device.
PART 3 - EXECUTION
3.01
A.
FUSE INSTALLATION
General Requirements:
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Fuses
MPS Master
SECTION 26 28 13
1.
Contractor shall install fuses in all fusible switches, except switches identified as "spare" or
"future".
2.
Contractor shall provide fuses of ampere ratings indicated on Drawings:
a.
b.
Where ampere ratings are not indicated, fuses shall be maximum rating permitted by
NEC for both conductors and panelboards.
Fusible switches serving motors with magnetic starters shall have fuses as follows:
1)
2)
3.02
A.
3.03
A.
3.04
A.
For motors with a marked temperature rise not over 40 degrees C or not less
than 1.15 S.F., fuses shall be sized at 125 percent of motor ampere rating or next
size larger if 125 percent does not correspond to a standard size fuse.
For all other motors, fuses shall be sized at 115 percent of motor ampere rating
or next size larger if 115 percent does not correspond to a standard size fuse.
FUSE CABINET
General Requirements: Provide storage cabinet to house spare fuses adjacent to main
switchboard or service entrance equipment.
1.
Fuse cabinet shall be wall mounted with hinged door, having a handle and latch.
2.
Cabinet shall be finished to match main switchboard.
3.
Sufficient storage capacity shall be provided to accommodate (6) fuses of each type.
4.
Label "FUSE CABINET" with black micarta plate with white cut letters.
SPARE FUSES
General Requirements: Upon completion of Project, Electrical Contractor shall furnish to
Owner's custodial staff, (3) spare fuses of each size and type furnished and installed on Project
to be retained by Owner as spares.
FUSE REDUCERS
General Requirements: Where fuse size required is too small for fuse holders, fuse reducers
shall be furnished.
END OF SECTION
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