Arc Flash

[jrannis]

Be careful racking in those breakers!!

http://www.ebaumsworld.com/video/watch/836122/

 

[zog]

Thats why alot of companies are going to remote racking.

 

[brian john]

Joe Tedesco has some info regarding this.

 

[zog]

I recieved some new info today on this video. Turns out this took place in Bogota Columbia in April 2007. The breaker being racked in had been in storage for a long time in a damp location allowing the fiberglass insulation to absorb moisture. The breaker is being placed back in service and racked in for the first time, no one tested the breaker before installation, when the line side disconnects contacted the buss the damp insulation allowed a phase to phase fault to occur.