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Tandem ELF current-limiting dropout fuse installation instructions
INSTALLATION INSTRUCTIONS
MN132029EN November 2016
!
WARNING
Do not attempt to interrupt load current by pulling on
the Tandem ELF fuse pull ring to open the cutout . An arc
started by opening a cutout under load in this manner
could cause injury or damage to equipment .
otee:
N
Interchangeable cutouts are equipped with hooks
for use with a loadbreak tool. To open the Tandem
ELF fuse from the cutout, use ONLY an approved
loadbreak tool designed for use with cutouts and
follow the instructions provided with such tool.
Operation and refusing
!
CAUTION
Only qualified personnel should operate a cutout . Such
personnel should always wear appropriate protective
equipment such as rubber gloves, hard hats, safety
glasses, etc ., in accordance with established utility and
safety practices .
!
CAUTION
A Tandem ELF fuse open in a cutout indicates a blown
fuse due to an overload or fault condition . Faults and/or
visibly failed equipment should be located and repaired
before refusing a Tandem ELF fuse .
When the Tandem ELF fuse (refer to Figure 6) operates, the
fuse will drop open in the cutout.
Removal of the tandem ELF fuse
1.
Insert a hook stick into the lifting eye of the Tandem
ELF fuse and remove it from the hinge of the cutout .
!
CAUTION
If the Tandem ELF fuse operates for a high current fault,
the backup current-limiting fuse may be hot enough to
cause burns . Wear gloves and handle the Tandem ELF
fuse by the fuse link holder to avoid burns .
Testing of the backup current-limiting fuse
The backup current-limiting fuse should always be tested
after an operation of the Tandem ELF fuse.
1.
Perform a continuity check on the backup
current-limiting fuse as shown in Figure 7 .
!
CAUTION
Failure to check the Tandem ELF’s backup current-
limiting fuse may result in placing an operated/
damaged fuse back in service . This could result in
personal injury, fire, or equipment damage .
2.
If the backup current-limiting fuse does not have
continuity,
change out the fuses as described in
“Refusing the Backup Current-Limiting Fuse” on
page 6.
If the fuse does have continuity,
skip to
“Refusing Fuse Link in Fuse Link Holder” on page 6.
Tandem elf
fuse
(Operated)
Lifting eye
Pull ring
Insulator
Lower
Connector
Hinge
Figure 6 . Tandem ELF fuse in Type L cutout after
operation
