Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Bus discconect failures?

Thread starter PVH
Start date Oct 28, 2004

Status: Not open for further replies.

Oct 28, 2004

PVH

Mechanical

Has anyone heard of any bus disconnect switchgear failures and their general causes. I have a rebuilt Sylvania HCSHD365 bus bus disconnect switchgear that when fastened to a 480-3phase switchgear worked fine but when the switch was thrown to connect it exploded. so much damage I can't tell if the stabs somehow shorted to ground or phase to phase. There were no tools or loose bolts in the switchgear box when the door was closed. The rebuilder claims that min resistance in a meggar test from phase to ground or phase to phase was 400 megOhm. There was no load side cabling yet connected at the time of failure. Any thought or prior experiences on what may have occurred here?

Phil