Switches and protective devices
Bay-O-Net fuse
Eaton’s Cooper Power series Bay-O-Net fuse assemblies are
used to protect transformers and distribution systems. The
assemblies are mounted on the faceplate of pad-mounted
transformers and combine the ease of hotstick operation
with the safety of deadfront construction (see Figure 8).
WARNING
Hazardous voltage. Can cause severe injury, death, or
damage to equipment.
• Do not operate loadbreak equipment if a fault
condition is suspected. Doing so can cause an
explosion or fire.
• Use a hotstick to operate transformer loadbreak
equipment.
• After operating transformer loadbreak equipment,
check that voltages at transformer terminals are
the expected values. Checking voltages verifies that
loadbreak equipment operated properly and that
electrical circuit conditions are as expected.
• Before servicing transformer secondary connected
equipment, verify that all transformer secondary
terminals have zero voltage and ground the
transformer secondary terminals following industry
accepted safe grounding practices. Grounding
secondary terminals protects against situations such
as a standby generator energizing transformer from
the secondary circuit.
• Before servicing transformer, ALWAYS de-energize
the transformer from a remote upstream source and
then proceed to ground all primary and secondary
transformer terminals following industry accepted
safe grounding practices. Grounding secondary
terminals protects against situations such as a
standby generator energizing transformer from the
secondary circuit.
• Follow industry accepted safety practices. Utilize
protective clothing and equipment when working with
loadbreak equipment.
WARNING
Three-phase pad-mounted transformers use
conventional transformer oil, R-Temp fluid, or
Envirotemp™ FR3™ fluid for an insulating liquid. When
the insulating liquid temperature is less than -20 °C
(-4 °F) for conventional transformer oil, less than 0 °C
(32 °F) for R-Temp fluid, or less than -10 °C (14 °F) for
Envirotemp™ FR3™ fluid, viscosity is reduced, which
may reduce make and break capabilities of loadbreak
devices. Below these temperatures, under-oil loadbreak
accessories should not be used to make or break a
load. Instead, de-energize transformer from a remote
upstream source before operating under-oil loadbreak
devices.
WARNING
Hazardous voltage. Can cause severe injury, death, or
damage to equipment. Use a hotstick to service a Bay-
O-Net fuse. Do not install a Bay-O-Net fuse to complete
an electrical circuit if a fault condition is suspected.
Do not re-energize suspected failed equipment. After
installing Bay-O-Net fuse, energize transformer from a
remote upstream source.
FUSEHOLDER
LATCH HANDLE
FUSE
CARTRIDGE
HOLDER
FUSE
LINK
FUSE
CARTRIDGE
END PLUG
GASKET SEAL
CONTACT
FLARE
TULIP
TIP
Figure 8. Bay-O-Net fuse assembly.
7Three-phase pad-mounted compartmental type installation and maintenance instructions MN202001EN August 2015
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