GE Industrial Solutions Entellisys Installation - Manual (Page 53)

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Entellisys Low Voltage Switchgear
Chapter 5. Installing and Removing Circuit Breakers
5-6 Installing and Removing EGF-
08/16 Fused Circuit Breakers
Except for the open fuse lockout device and the integrally
mounted fuses on the upper studs, the EGF-08 and -16
breakers are identical to the non-fused EGS-08 and -16
models. The procedural steps for installing and removing the
EGF-08/16 breakers from the Entellisys switchgear
equipment are the same as that described in paragraph 5-2
and 5-4 for non-fused EGS-08/16 breakers.
5-7. Installing Fuses on EGF-08/16
Circuit Breakers
The fuses on EGF-08/16 breakers are mounted on the line
side primary disconnect conductors. The Class L fuses are
mounted as shown in Fig. 5-12. Other than the 800A size,
which has a single mounting hole per tang, each Class L fuse
tang has two holes sized for one-half inch bolts.
Appendix G includes a tabulation of the range of fuse sizes
available for these breakers including catalog numbers of
Ferraz-Shawmut Fuses.
Class J fuses rated 300 through 600A have one mounting
hole per tang. The 300, 350 and 400A sizes require copper
adapter bars as shown in Fig. 5-13.
Fig. 5-12. Typical mounting for Class "L" fuse on EGF-08/16 breakers
Fig. 5-13. Mounting for 300, 350, and 400-ampere Class "J" fuses on
EGF-08 breakers
A special fuse is available for use with EGF-16 breakers.
This fuse provides a melting time-current characteristic that
coordinates with 1600A trip electronics. Compared physically
with a 2500A, NEMA Class L fuse, the special fuse is more
compact (shorter) and its tangs are specially configured and
offset to achieve the required pole-to-pole fuse spacing. A
special primary disconnect assembly mounts directly on the
outboard tang of the fuse. Because of their unique mounting
provisions, the following procedure should be adhered to
when replacing these fuses (Fig. 5-14):
1. Special 2500A fuse 3. Upper barrier
2. Disconnect key 4. Primary disconnect
Fig. 5-14. EGF-16 breaker with special 2500-ampere fuse
1
2
3
4