G E C

[Greghollis]

Help me understand 250.66

GEC Shall not be required to be larger than # 6


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[jumper]

Help me understand 250.66

GEC Shall not be required to be larger than # 6


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If you are referring to ground rods, then no matter what the size of the service, the ground wire / Grounding Electrode Conductor that goes only to the rods never needs to be larger than #6.

 

[GoldDigger]

The motivating force behind that decision is that at voltages less than 600V even a bolted short to the EGC will not send enough current through a reasonable ground-rod-to-earth resistance to overload a #6 copper conductor.

 

[Greghollis]

Well I don’t have my book with me , but what about the table that shows a 200 amp service 4/0 Al. To be a # 4 GEC ?


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[nickelec]

As stated above u don't need anything larger then #6 to connect to a ground rod ONLY. If your Grounding electrode is a water main for instance then 250.66 would apply

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[Greghollis]

Ok I get it now , thanks.


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[jumper]

Well I don’t have my book with me , but what about the table that shows a 200 amp service 4/0 Al. To be a # 4 GEC ?


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Well, then you need to go get it and look at the applicable section.

For rods, 250.66(A).

For other electrodes, sizing is different.

 

[Greghollis]

Well, then you need to go get it and look at the applicable section.

For rods, 250.66(A).

For other electrodes, sizing is different.

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[jumper]

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I tried to post the section but my NEC pdf and ipad don’t play well together, frustrating.