max. equipment ground wire allowed for 20A, 208V/1PH outlet

[anbm]

Anyone know what is max. ground wire size can be terminated into 208V/1PH/20A outlet grounding terminal? One client wants to use #6 ground wire even we said code allows #12G. (this outlet serves IT equipment)

 

[iwire]

Anyone know what is max. ground wire size can be terminated into 208V/1PH/20A outlet grounding terminal? One client wants to use #6 ground wire even we said code allows #12G. (this outlet serves IT equipment)

Putting aside that this is an ridiculous request by the customer ....

Likely 10 AWG for standard 15 & 20 amp receptacles.

You might be able to use a ring terminal crimp on the 6AWG but what would you use as the box to leave enough room to fit it in.

 

[infinity]

I would guess that a #10 is the largest conductor for a standard 20 amp device. I've never seen a 20 amp device tha can take up to a #6 EGC unless you used some sort of fork terminal on the #6 to connect to the screw.

 

[kingpb]

... we said code allows #12G

Yes, the NEC minimum requirement for safety allows you to use a #12AWG, however, that does not mean you can't or shouldn't provide something larger.

The device in question will most likely directly accept a #10AWG, but no larger.

 

[petersonra]

Putting aside that this is an ridiculous request by the customer ....

There is no such thing as a ridiculous request by a customer as long as it is accompanied by a P.O. to cover the cost.

We get requests pretty regularly for putting ground lugs in control panels to accept a #2 wire.

Even those fed by a single 15A 115V branch circuit.

It is their money. If they want to run a #2 EGC, why would I care? As far as I am concerned, I don't care if they ever run any EGC at all. As long as they pay their bill.

 

[Dennis Alwon]

I will be contrary and say there is no max as you may have to run #6 or even larger depending on voltage drop. If you increase the #12 ungrounded conductors to #6 for voltage drop then the egc must also be #6

 

[jumper]

I will be contrary and say there is no max as you may have to run #6 or even larger depending on voltage drop. If you increase the #12 ungrounded conductors to #6 for voltage drop then the egc must also be #6

Dennis, you can run a 250 kcmil and no one will argue, OP was asking about 20 amp device terminal wire sizes.

 

[iwire]

I will be contrary and say there is no max as you may have to run #6 or even larger depending on voltage drop. If you increase the #12 ungrounded conductors to #6 for voltage drop then the egc must also be #6

I will stick with 10 AWG directly.

Anyone know what is max. ground wire size can be terminated into 208V/1PH/20A outlet grounding terminal?

 

[Dennis Alwon]

Dennis, you can run a 250 kcmil and no one will argue, OP was asking about 20 amp device terminal wire sizes.

I will stick with 10 AWG directly.

Oh dopey me... :lol: