Long Feeder Cables + Switchgear Line Side Protection
Long Feeder Cables + Switchgear Line Side Protection
(OP)
hey folks,
i have a 2000ft cable that feeds a 4.16kV switchgear lineup. the cable has a 1200A breaker at the source end, so it will protect the cable adequately.
my question is this: does my 4.16kV switchgear lineup require a protection device on the line side (breaker/fuse)? are there any references to NEC/CEC that may provide a guideline?
client is suggesting using a load break switch only.
the reason i ask is because i figure the 1200A breaker will do an adequate job of protecting the cable, but what if there is a fault at the switchgear. wouldn't you want a fuse/breaker on the line side of the switchgear to quickly clear any faults and prevent damage to the cable?
i have a 2000ft cable that feeds a 4.16kV switchgear lineup. the cable has a 1200A breaker at the source end, so it will protect the cable adequately.
my question is this: does my 4.16kV switchgear lineup require a protection device on the line side (breaker/fuse)? are there any references to NEC/CEC that may provide a guideline?
client is suggesting using a load break switch only.
the reason i ask is because i figure the 1200A breaker will do an adequate job of protecting the cable, but what if there is a fault at the switchgear. wouldn't you want a fuse/breaker on the line side of the switchgear to quickly clear any faults and prevent damage to the cable?






RE: Long Feeder Cables + Switchgear Line Side Protection
Why couldn't you come up with settings for the upstream breaker that protects both the cables and switchgear?
RE: Long Feeder Cables + Switchgear Line Side Protection
Now a days, breaker panel and disconnector panel costs may not be substantially different. You should go for breaker. If you don't want to provide protection, fine.
RE: Long Feeder Cables + Switchgear Line Side Protection
in my mind, if i wait for the upstream breaker to operate, won't it take slightly longer? longer clearing times = higher incident energies for arc flash?
RE: Long Feeder Cables + Switchgear Line Side Protection
RE: Long Feeder Cables + Switchgear Line Side Protection
RE: Long Feeder Cables + Switchgear Line Side Protection