can I lock a disconnect switch in the closed position
can I lock a disconnect switch in the closed position
(OP)
I have seen some medium voltage disconnect switches locked in the closed position. It appears this was done to avoid some vandalism as the switchgear is not enclosed in a fence. Is this acceptable?






RE: can I lock a disconnect switch in the closed position
RE: can I lock a disconnect switch in the closed position
RE: can I lock a disconnect switch in the closed position
RE: can I lock a disconnect switch in the closed position
Mostly the medium voltage disconnectors are locked by Blocking magnets, Where as High voltage manual drive Disconnectors are mostly available with Padlocking arrangement on both Extremes (Fully Open & Fully Closed). Can u give yr actual requirement why u need to lock that in ON Position If thats an operational requirment the same can be achived by the blocking magnet technique, which is practicing in most cases.
RE: can I lock a disconnect switch in the closed position
Ill-timed loss of power to certain storm-drain pumps could present significant hazard to life and property, like, for example, in New Orleans.
RE: can I lock a disconnect switch in the closed position
For electric utilities, I think it is very common to lock pole-mounted disconnect switches closed to prevent unauthorized operation.
It just depends on your situation.
RE: can I lock a disconnect switch in the closed position
RE: can I lock a disconnect switch in the closed position
RE: can I lock a disconnect switch in the closed position
Also, NFPA 70-2002 NEC makes distinction between 35000V and under and 35000V above. The 35000V above is covered under Transformer Vaults that have locked doors. If the switch is part of service equipment, it shall be behind locked doors.