Eaton Tandem ELF Current-Limiting Dropout Fuse - Refusing the Backup Current-Limiting Fuse; Refusing the Fuse Link in Fuse Link Holder; Maintenance

5
Tandem ELF current-limiting dropout fuse installation instructions
INSTALLATION INSTRUCTIONS MN132029EN November 2016
Refusing the backup current-limiting fuse
1. Remove the backup current-limiting fuse by
unbolting it from the middle connector.
2. Unbolt the upper pull ring connector from the
backup current-limiting fuse and replace with a new
backup current-limiting fuse. Bolt the reused upper
pull ring connector to the new backup current-limiting
fuse noting proper engagement of the alignment key.
See Figure 8.
3. Bolt the backup current-limiting fuse to the middle
connector noting proper engagement of the
alignment key as shown in Figure 8.
Refusing the fuse link in fuse link holder
1. Remove the fuse cap and then the operated fuse
link from the fuse link holder of the Tandem ELF
fuse.
2. Visually inspect the fuse link holder bore and
remove any debris.
3. Continue with the steps outlined in “Installing a
Fuse Link in Fuse Link Holder” on page 2.
Maintenance
Refer to ANSI Standards (C37.48) as a general guide for
maintenance of the cutout.
1. Periodically inspect the fuse link at the lower end of
the fuse link holder for evidence of corrosion.
2. Replace fuse links which show signs of
deterioration (broken strands, heavy corrosion, etc).
3. Replace broken or cracked porcelain and clean or
replace if heavily contaminated.
4. Inspect contacts for excessive pitting or burning
and replace as necessary.
5. Check the fuse link holder fiber liner for cracking or
excessive erosion. If cracked or if the I.D. is larger than
0.45”, then replace the fuse link holder.
6. If the fuse link holder shows any signs of electrical
tracking it should be replaced.
Middle
connector
Upper
Pull ring
connector
Hardware
Hardware
Backup current-
limiting fuse
Continuity
tester
Figure 7. Testing/refusing the backup current-limiting
fuse
Middle
connector
Alignment key
Bolt
Lock washer
Upper pull ring
connector
Fuse link holder
Backup current-
limiting fuse
Alignment key
Figure 8. Refusing the backup current-limiting fuse