GEC length 2nd part

[codequestion]

Other thread locked before I say something else. I thought that GEC suppose to be short as possible. So if i have electrode 100 feet away and other at 20 feet away, 20 feet electrode should be used as electrode and GEC connected. Where is it in NEC?

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[GoldDigger]

Other thread locked before I say something else. I thought that GEC suppose to be short as possible. So if i have electrode 100 feet away and other at 20 feet away, 20 feet electrode should be used as electrode and GEC connected. Where is it in NEC?

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That is a common sense design issue, so do not expect to find that in the code.

Note also that ifr you have two rod or other electrodes you are pretty much required to connect to them both. But the connection to the closer one would be the GEC and must be continuous and the wire extending to the far electrode would be a bonding jumper instead.

 

[jumper]

There is an informational note that has a recommendation, but this is a suggestion, not a mandate.

250.4(A)(1)

Informational Note: An important consideration for limit- ing the imposed voltage is the routing of bonding and grounding electrode conductors so that they are not any longer than necessary to complete the connection without disturbing the permanent parts of the installation and so that unnecessary bends and loops are avoided.

Somewhere in article 800 there is some section about limited length, but that would apply to that article only.

 

[kwired]

As mentioned good design practice to keep as short as possible. Reality is that is not always practical.

Example upgrading service in existing building - you probably drive ground rod(s) near the service if practical, but that metallic underground water pipe that enters the building 200 feet away needs to be connected to and you are not ordinarily changing the distance on this.