Safety

[rash]

What voltage level is an insulating mat require when an operator is working on a
switchgear/switchboard?

 

[bphgravity]

Re: Safety

I can't seem to find any specifications on this in either the OSHA standards or the NFPA 70E. The only wording is "as needed". I do know that ASTM has standards on rubber insualted mats. You may want to chaeck with them.

I do know the NEC requires floor insulation at live-front equipment that exceeds 150-volts to ground.

 

[ryan_618]

Re: Safety

From the 2002 NEC

250.174 Cases of Instruments, Meters, and Relays Operating at Less Than 1000 Volts.

(C) On Live-Front Switchboards. Instruments, meters, and relays (whether operated from current and potential transformers or connected directly in the circuit) on switchboards having exposed live parts on the front of panels shall not have their cases grounded. Mats of insulating rubber or other suitable floor insulation shall be provided for the operator where the voltage to ground exceeds 150.