250.66a against T250.66

[ActionDave]

250.64

(F) Installation to Electrode(s). Grounding electrode
conductor(s) and bonding jumpers interconnecting ground-
ing electrodes shall be installed in accordance with (1), (2),
or (3). The grounding electrode conductor shall be sized for
the largest grounding electrode conductor required among
all the electrodes connected to it.

(1) The grounding electrode conductor shall be permitted
to be run to any convenient grounding electrode avail-
able in the grounding electrode system where the other
electrode(s), if any, is connected by bonding jumpers
that are installed in accordance with 250.53(C).

 

[Smart $]

250.64

(F) Installation to Electrode(s). Grounding electrode
conductor(s) and bonding jumpers interconnecting ground-
ing electrodes shall be installed in accordance with (1), (2),
or (3). The grounding electrode conductor shall be sized for
the largest grounding electrode conductor required among
all the electrodes connected to it.

(1) The grounding electrode conductor shall be permitted
to be run to any convenient grounding electrode avail-
able in the grounding electrode system where the other
electrode(s), if any, is connected by bonding jumpers
that are installed in accordance with 250.53(C).

Okay... thanks for being persistent. Looks like I have to revise my comprehension of grounding electrode system requirements once again. Fits right in with your comment, "The CMP's keep approving new verbiage and adding new terms like "equipment bonding jumper" and "system bonding jumper" that make a simple idea harder to learn and look up references for in the codebook." I still say a lot of the revisions through the years have basically to get around having to use irreversible connections.

 

[don_resqcapt19]

...I still say a lot of the revisions through the years have basically to get around having to use irreversible connections.

I submitted a public input to remove that requirement. There is no technical reason for it. The GEC in no more important for electrical safety than is the EGC.

 

[Smart $]

I submitted a public input to remove that requirement. There is no technical reason for it. The GEC in no more important for electrical safety than is the EGC.

I agree... but it's been in there forever.

We'll see how that flies...

 

[kwired]

I submitted a public input to remove that requirement. There is no technical reason for it. The GEC in no more important for electrical safety than is the EGC.

I'd say as a general rulethe GEC not as important as the EGC. Yet have had inspectors just about have an Aneurysm, or at least a hissy fit, if they showed up at a project and I have some circuits already in use and still don't have the GEC finished.

 

[jchelm24]

Same question different way?

Same question different way?

So I have a 200 amp residential 120/240 service. GEC to Ground Electrode (rod) is 4awg per the Table. But the exception allows me to use a 6 awg GEC since this is my sole GEC and GE. Is this right?

 

[Smart $]

So I have a 200 amp residential 120/240 service. GEC to Ground Electrode (rod) is 4awg per the Table. But the exception allows me to use a 6 awg GEC since this is my sole GEC and GE. Is this right?

Yes, but if this rod is your only GE, you must qualify for 250.53(A)(2) Exception...

(2) Supplemental Electrode Required. A single rod, pipe,
or plate electrode shall be supplemented by an additional
electrode of a type specified in 250.52(A)(2) through
(A)(8). The supplemental electrode shall be permitted to be
bonded to one of the following:
(1) Rod, pipe, or plate electrode
(2) Grounding electrode conductor
(3) Grounded service-entrance conductor
(4) Nonflexible grounded service raceway
(5) Any grounded service enclosure

Exception: If a single rod, pipe, or plate grounding electrode
has a resistance to earth of 25 ohms or less, the
supplemental electrode shall not be required.