ABB Galaxy Power System - Page 12

Page 12
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To determining the minimum cable length to achieve the required interrupt circuit rating of circuit
breaker or fuse, use the following steps:
1. Find the interrupt current rating of the chosen fuse or circuit breaker from Table 2 - B.
2. See Table 2 - A for the minimum length (L) for the engineered cable size to be run at the interrupt
rating found in Step 1.
Table 2 - A: Cable Run Lengths
Cable Size
Minimum Length “L” Required to Limit the Current to an Interrupt Rating of:
25KA 10KA
10 GA
(6mm
2
)
-- -- 5 feet
8 GA
(10 mm
2
)
-- -- 8 feet
6 GA
(16 mm
2
)
-- 5 feet 12 feet
4 GA
(25 mm
2
)
-- 8 feet 19 feet
2 GA
(35 mm
2
)
3 feet 12 feet 30 feet
1/0 GA
(50 mm
2
)
5 feet 19 feet --
2/0 GA
(70 mm
2
)
6 feet 24 feet --
4/0 GA
(120 mm
2
)
10 feet 38 feet --
(2) 4/0 GA
((2) 120 mm
2
)
19 feet 76 feet --
(3) 4/0 GA
((3) 120 mm
2
)
29 feet 113 feet --
350 MCM 17 feet 63 feet --
(2) 350 MCM 32 feet 125 feet --
(3) 350 MCM 47 feet 188 feet --
Precautions (continued)
Table 2 - B: Interrupt Current Ratings for Fuses and Circuit Breakers
Description
ED83143-31
Groups
Interrupt
Current Rating
(amps)
Large bolt-in circuit breakers
1, 2, 5 25,000
Small plug-in circuit breakers
11, 12 10,000
Small bullet-style circuit breakers
15 - 17 10,000
Large fuse (TPL)
54 - 56, 72 100,000
Medium fuse (TPS)
53 100,000
Small plug-in fuse (TPA)
11, 12 100,000
DIN-style fuses
Not available from ABB
Contact fuse or circuit breaker manufacturer.
DIN-style circuit breakers
Not available from ABB
Contact fuse or circuit breaker manufacturer.