In article . net, RoyJ says...

My electrican was in wiring for my new TIG welder yesterday and the
subject of conduit grounding came up. He said that the local code for
commercial spaces allows a maximum of 6' flex conduit before you have to
run a seperate groud wire inside.

Flex conduit (greenfield) and rigid are two kinda different
animals. Whereas I might consider not running a green wire
inside rigid, I would always run one inside of greenfield
or liquid-tight, given the nature of the connectors at the
ends.

Jim


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