NEC 2017

[hhsting]

In NEC 2017 would 208V single phase 30A receptacle, 208V three phase receptacle 50A in kitchen to be GFCI? I would say yes but not sure confuse by 150V to ground language.

 

[d0nut]

Yes. A 208Y/120V system is 120V to ground, which meets the 150V to ground or less requirement. A receptacle on a 480Y/277V system, for example, would be greater than 150V to ground and would not require GFCI.

 

[don_resqcapt19]

While that was the intent the language is based on the voltage rating to ground of the receptacle and receptacles do not have such a rating. The language was revised in 2020 to say what they really meant ....GFIC protection is required where the receptacle is supplied by a branch circuit rated 150 volts of less to ground.

2017 210.8(B) Other Than Dwelling Units. All single-phase receptacles rated 150 volts to ground or less, 50 amperes or less and three phase receptacles rated 150 volts to ground or less, 100 amperes or less installed in the following locations shall have ground-fault circuit-interrupter protection for personnel

2020 210.8(B) Other Than Dwelling Units. All 125-volt through 250-volt receptacles supplied by single-phase branch circuits rated 150 volts or less to ground, 50 amperes or less, and all receptacles supplied by three-phase branch circuits rated 150 volts or less to ground, 100 amperes or less, installed in the locations specified in 210.8(B)(1) through (B)(12) shall have ground fault circuit-interrupter protection for personnel.

The 2017 requirement is not technically enforceable, but it is likely the the AHJ will enforce the intent and not the actual language.