NEC Compliant Cap Cord

[FionaZuppa]

Electrically it works, but is it violation of NEC or other code?
LLN to LLNG adapter, using EGC from some other BC.

 

[suemarkp]

I see it as a most likely technical violation of 250.122. That 120V circuit they tapped into for the ground is probably #12 (or even #14 if using a power strip). The source power circuit is probably 30A and #10.

Not sure the NEC applies to adapter cords. More of a UL or listing agency issue, but not sure they are required to be listed. I've bought many an adapter cord that was not listed.

Also seems like a poor connection method. A ring terminal under the coverplate screw would be better than a plug you can just pull out.

 

[Tulsa Electrician]

Against the code of common sense.

 

[FionaZuppa]

The source power circuit is probably 30A and #10.

Would a two pole gfi breaker make sense to have when using such adapter? Still would not meet magnetic trip curve, but the gfi part should be substantially lower than power strip wire?

 

[suemarkp]

This method can work, it just isnt reliable. In the old days, equipment grounds were 1 size smaller in 14, 12, and 10 awg circuits. Circuit breakers still tripped. Today, the EGC has to be the same size in 15, 20, and 30A circuits. 2020 code requires a gfci on electric clothes dryers too. So yes a gfci makes it safer as long as it doesnt nuisance trip.