service grounding

Dennis Alwon said:
Wouldn't you need to make detail 1 non reversible for the two grounding electrode conductor's coming from the panel?
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Do you mean in this detail 1? Or the modified version in post #8?

c147749b08092d884507f865f7e285d8.jpg
 
infinity said:
I already stated that the second method is code complaint. You've stated that you're a plan reviewer so you either say it is

code complaint or it isn't. Several others have already stated that is is code compliant. Why would it not be code compliant?
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See post #13 by wwhtiney thats why
 
hhsting said:
See post #13 by wwhtiney thats why
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You quoted me and I already stated that it is code compliant. With all due respect to wwhitney there is no reason to reinvent the wheel and reading that post hurts my eyes. A plan reviewer should look at what's given and determine code compliance.

If you put up a poll as the whether or not 1 and 2 are code compliant it should be unanimous that both are which answers your initial question.
 
My feeling is if each grounding electrode conductor was sized for the service then there is no need to make the connection irreversible, however, if each grounding electrode conductor was sized for each panel then it would appear the connection would need to be irreversible.
 
Dennis Alwon said:
My feeling is if each grounding electrode conductor was sized for the service then there is no need to make the connection irreversible, however, if each grounding electrode conductor was sized for each panel then it would appear the connection would need to be irreversible.
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Service is 400A with 600 kcmil copper. Each main service disco is 200A. From meter to each service disco I have 3/0 awg copper conductors. So then what would the conductor size be each figures?
 
hhsting said:
See post #13 by wwhtiney thats why
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By "excessive" I didn't mean a violation of the NEC, I meant unnecessary.

Your original post has some hand drawing you made, rather than a set of plans you are reviewing, and has no reference to reviewing plans. So my responses in this thread have not simply been focused on "should you pass or reject a specific set of plans" but rather broader aspects your question raises.

Cheers, Wayne
 
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infinity said:
With all due respect to wwhitney there is no reason to reinvent the wheel and reading that post hurts my eyes.
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OK, let me simplify my main point there: In version 2 in the OP, why run 6 GECs/bonding jumpers to the panels when 4 would suffice? It's a waste of time and material. [Either option is NEC compliant.]

Cheers, Wayne
 
wwhitney said:
OK, let me simplify my main point there: In version 2 in the OP, why run 6 GECs/bonding jumpers to the panels when 4 would suffice? It's a waste of time and material. [Either option is NEC compliant.]

Cheers, Wayne
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Not sure if this is being overlooked or not but NEC 2017 Article 250.64(D)(2) code language says “a grounding electrode conductor shall be connected between the grounding electrode system….”.

Shall be means mandatory no alternatives allowed. “A” i see it as single grounding electrode conductor

So the way i see it single grounding electrode conductor is mandatory no alternatives allowed between grounding electrode system and ….

So post #1 attachment number 2 is alternative it has multiple grounding electrode from service disco two to grounding electrode system is its not code complaint? Please correct me if I am wrong


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infinity said:
Not sure what this means but the second graphic has three electrodes and six GEC's. Are you saying that it not accurate?
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You CAN have a hundred rods if you like.
hhsting said:
If I tie grounding electrodes together with bonding jumper then what size bonding jumpers i need? I have 3/0 awg copper into each service disco

Also lets say i bring one GEC per electrode to one service disco and run one gec from another service disco one of the grounding electrodes then what size grounding electrodes i need from each service disco?
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Dwelling units have different requirements than other types of use. Generally you can bond all the GE to the GEC of the largest required GEC, All GE present must be bonded to and used. The GEC for each respective GE would be sized to it's respective required GEC size. Rods only require a max size of #4 others sized to 250.66, 250.68, 250.122
 
hhsting said:
Not sure if this is being overlooked or not but NEC 2017 Article 250.64(D)(2) code language says “a grounding electrode conductor shall be connected between the grounding electrode system….”.

Shall be means mandatory no alternatives allowed. “A” i see it as single grounding electrode conductor
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No. "A foo shall do bar" means that you have at least one foo that does bar. No upper limit is conveyed on the number of such foos. [Foo and bar are the linguistic equivalents of X and Y in algebra.]

If the intention was to impose the requirement that exactly one foo does bar, then the text would say "A single foo shall do bar" or even better "Exactly one foo shall do bar."

Cheers, Wayne
 
wwhitney said:
No. "A foo shall do bar" means that you have at least one foo that does bar. No upper limit is conveyed on the number of such foos. [Foo and bar are the linguistic equivalents of X and Y in algebra.]

If the intention was to impose the requirement that exactly one foo does bar, then the text would say "A single foo shall do bar" or even better "Exactly one foo shall do bar."

Cheers, Wayne
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Without clearly saying interpretation can go both ways at lest one or exactly one.

They should write these things more clearly
 
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