Isaiah
Senior Member
- Location
- Baton Rouge
- Occupation
- Electrical Inspector
Last night, we had three MCBs trip at the same time on 480V switchgear located in different buildings. The protective relays, ie SEL-751, showed no indication of spikes or surges (also no SPDs are installed at the 480V).
Any ideas what could have caused the MCBS to open?
Sent from my iPhone using Tapatalk
Any ideas what could have caused the MCBS to open?
Sent from my iPhone using Tapatalk