In an article on Arc Flash Hazards, this month's NEC Digest recounts the story of an electrician getting burned while attempting to install a commercial meter into the socket.
He verifying the absence of ground faults on the load side he inserted the meter. After the load side stabs engaged, he pushed the line side stabs in. That is when the flash occurred.
What other safety procedures are followed prior to inserting a socket-type meter?
I always (usually) check for voltage between the line & load side socket terminals before plugging in a meter.
Sometimes, 20-30 volts or so is present, between L1 on the line side & L1 on the load side,(same for L2) even though the Main Breaker is open.
Where is this voltage coming from?
