#10 awg ground tails

[JoeHon]

We are installing 50 amp devices. I believe my #10 EGC has to extend to the device, but does my pig tail also have to be #10? 250-122 leads me to believe that it does, but I am having trouble locating this product at a supply house which leads me to believe I may be missing something? Thanks for your help.

 

[roger]

Why not just make them with a ground screw and piece of # 10?

Roger

 

[JoeHon]

Mass production. So it is correct that a #10 is required?

 

[kwired]

solid metal to metal contact between a device and metal box is sufficient and would not require a bonding jumper.

 

[Dennis Alwon]

If you are using So cord then generally the equipment grounding conductor is the same size as the other conductors. 250-122 does allow a #10 to be used as the equipment grounding conductor but as I stated I don't think you will find a #8 So xx cord with a #10 equipment grounding conductor.

 

[Volta]

And maybe bigger than that, if your ungrounded conductors are #6 AWG THHN at 75 deg C per 250.122(B). You'd need #8 to the box.

 

[infinity]

solid metal to metal contact between a device and metal box is sufficient and would not require a bonding jumper.

Wouldn't that be dependent on the type of box?

 

[JoeHon]

Please allow me to clarify a little more. This is a data center enviroment, we are using 8/3 w/ ground cora clad and running to a metal box with a 2 wire 50A device that computer equipment plugs into. The 8/3 has a #8 ground which is oversized since we are using a 50 amp overcurrent protection device. I believe the code (250-122) requires me to run at least #10 to the device, my primary concern is the pig tail to the box and the sizing requirements. I believe it falls under 250-122 as well??

Roger- Thank you I believe that may be what we have to do. And thanks to everyone for your feedback, this seems to be a great forum.

Joe

 

[eHunter]

Please allow me to clarify a little more. This is a data center enviroment, we are using 8/3 w/ ground cora clad and running to a metal box with a 2 wire 50A device that computer equipment plugs into. The 8/3 has a #8 ground which is oversized since we are using a 50 amp overcurrent protection device. I believe the code (250-122) requires me to run at least #10 to the device, my primary concern is the pig tail to the box and the sizing requirements. I believe it falls under 250-122 as well??

Roger- Thank you I believe that may be what we have to do. And thanks to everyone for your feedback, this seems to be a great forum.

Joe

Take a look at:
http://www.ebay.com/itm/Green-Groun...6-inch-Stranded-Wire-/150557311514#vi-content

 

[mjf]

Take a look at:
http://www.ebay.com/itm/Green-Groun...6-inch-Stranded-Wire-/150557311514#vi-content

Looks like this is aluminum and doesn't have a screw or stack-on connector or anything included

 

[eHunter]

Looks like this is aluminum and doesn't have a screw or stack-on connector or anything included

You are welcome.

 

[kwired]

Wouldn't that be dependent on the type of box?

beyond the box being metallic (which I mentioned) what else did you have in mind?

The device must have its mounting yoke/strap be metallic and connected to equipment grounding conductor terminal of receptacle devices also, but I don't think you will find any that are not.

Flush devices that do not make metal to metal contact must have a bonding jumper, but that is covered in what I said before.

 

[infinity]

Flush devices that do not make metal to metal contact must have a bonding jumper, but that is covered in what I said before.

I was thinking of flush devices that do make metal to metal contact with the yoke or an old work (gem) box.