Liquid Tite for ground

[D.T.]

Is the rule that if you run more than 6' of liquid tite that you have to run a "extra" ground wire? Say from EMT to a machine?

I had a weird problem once with wires "welding" and overheating in Liquitite. Machine was rated for a 208V, 30A circuit, pulled in 10 ga wire, but the 3 phases got hot and melted the liquitite. Tripped the CB. We re pulled the wire and no problems since.

I see a AFCI would prevent a possible fire.

 

[Rockyd]

Gets a little tricky here, but if you go to 250.118(6) it will explain the 20 amp, and 60 amp, "rules" respectively

 

[masterinbama]

Liquidtite certainly will not carry the amps from a welder.Had a drying table in a food processing plant with a carriage that rode on rubber wheels.The carriage controls (75 # 16 wires)were ran in liquidtite flex.the plant welder needed to weld some stop dogs on the carriage needless to say he hooked his ground to the table and started welding I'll bet you can guess the rest 24 hours and a lot of cussing later we got the machine back on line

 

[barbeer]

I would say your conductors were damaged inside the liquid-tight for them to "weld" together.

Maybe I do not understand the question.?