480Volt GFCI

[wireday]

Assuring bonding is good is the best thing you can do with this thing.

Unlike 5-15 and 5-20 cord caps I never seen a missing EGC pin on a twist lock plug, that is a big thing also.

Are you saying as apposed to a straight blade plug?

 

[wireday]

Assuring bonding is good is the best thing you can do with this thing.

Unlike 5-15 and 5-20 cord caps I never seen a missing EGC pin on a twist lock plug, that is a big thing also.

Assuring bonding is good is the best thing you can do with this thing.

Unlike 5-15 and 5-20 cord caps I never seen a missing EGC pin on a twist lock plug, that is a big thing also.

I agree, I always think about cord damage over time, I know SO is tough.

 

[wireday]

I agree, I always think about cord damage over time, I know SO is tough.

this is 30amp

 

[kwired]

Are you saying as apposed to a straight blade plug?

Maybe. Never seen anything besides twist lock or pin and sleeve for 480 volts. Never seen missing EGC in pin and sleeve either.

 

[ptonsparky]

Given an assured, intact EG and 30 ma ground fault protection for equipment. What circumstances would allow a significant touch potential and more than 6ma to be available?

 

[wireday]

Given an assured, intact EG and 30 ma ground fault protection for equipment. What circumstances would allow a significant touch potential and more than 6ma to be available?

just damage over time to the SO cord, also i do not believe this requires any GFPE, I just wanted GFCI

 

[winnie]

If my design intent were to exceed code requirements for this apparatus, I'd look for automated EGC integrity monitoring.

While there is not an NEC code requiring ground fault protection of this equipment, you may find that there are OSHA requirements requiring inspection of the EGC integrity. Not that I have any strong certainty on that point.

-Jon

 

[Jraef]

I will partially disagree with Jraef.

As used by UL, 'GFCI' applies to any residual current device that is intended to protect people.

For high voltage and industrial applications UL recognizes the need for higher trip thresholds, and describes different classes of GFCI offering different protection for different circumstances.

The physics that Jraef describes is spot on. A 50A 480V piece of apparatus is very likely to have higher necessary leakage than a toaster, and class A protection impossible to use.

See https://iaeimagazine.org/features/n...have-a-proactive-option-for-shock-protection/

Jon

OK, I will have to agree with your disagreement. (lost yet?)

As far as the NEC goes, GFCI only pertains to Class A devices, 150V to ground or less. Class B is still allowable ONLY for swimming pool lights.

UL however has added more "classes" when they updated UL943 to Rev C a few years ago and they DO refer to them as "GFCI". So yes, , even though the definition of "GFCI" is only referenced in the NEC to Class A and B, now there are different classes per UL, such as Class C, D and E for higher voltages, so long as certain other criteria are met.. Here is a handy little chart for figuring out how it all works.


But again, UL is not the NEC, there is no requirement for GFCI protection for 480V equipment in the NEC, so the use of these devices is not mandatory, it is voluntary..

 

[kwired]

OK, I will have to agree with your disagreement. (lost yet?)

As far as the NEC goes, GFCI only pertains to Class A devices, 150V to ground or less. Class B is still allowable ONLY for swimming pool lights.

UL however has added more "classes" when they updated UL943 to Rev C a few years ago and they DO refer to them as "GFCI". So yes, , even though the definition of "GFCI" is only referenced in the NEC to Class A and B, now there are different classes per UL, such as Class C, D and E for higher voltages, so long as certain other criteria are met.. Here is a handy little chart for figuring out how it all works.
View attachment 2557246

But again, UL is not the NEC, there is no requirement for GFCI protection for 480V equipment in the NEC, so the use of these devices is not mandatory, it is voluntary..

so far.

 

[mbrooke]

Assuring bonding is good is the best thing you can do with this thing.

Unlike 5-15 and 5-20 cord caps I never seen a missing EGC pin on a twist lock plug, that is a big thing also.

The thing is, as I'm reading UL and the ROPs, the concern is also over the voltage drop across the EGC during a fault-

Consulting - Specifying Engineer | UL’s new GFCI classes

Consulting - Specifying Engineer - Learning objectives Understand UL’s new GFCI classes. Understand how GFCIs for 240 to 600 V applications differ from the familiar Class A GFCIs. Know

www.csemag.com

Their curve, is directly based off IEC 60479-1.

Personally, with a breaker opening in less than 0.5 seconds I do not see a need for this device.

 

[romex jockey]

GFCIstore.com has a GFCI model with selectable 6-10-30 ma settings.

Just bought ptonsparky's widget , gotta application & will post final results

~RJ~

 

[wireday]

Isn't assured grounding that is required by OSHA for construction/temporary, Extension cords. This heater is a short SO cord from the heater to the receptacle. Does this need assured grounding program?