#2 to ground rod?

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wirebender

wirebender

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North Central Texas
I was looking through an exam prep book and saw this:

What is the minimum size (OSHA requirement) of a conductor
to a ground rod?
#2 AWG copper.
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Is this right? OSHA is not real strong down here and we seldom even see them around so I wouldn't know if this is true is not. If it is, what is their reasoning.
 
don_resqcapt19

don_resqcapt19

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Cavie said:
OhSA woild have nothing to say on the matter. It is not an occupational issue.
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Actually Subpart S of 1910 has electrical installation design standards.
1910.301(a)
Design safety standards for electrical systems. These regulations are contained in 1910.302 through 1910.330. Sections 1910.302 through 1910.308 contain design safety standards for electric utilization systems. Included in this category are all electric equipment and installations used to provide electric power and light for employee workplaces. Sections 1910.309 through 1910.330 are reserved for possible future design safety standards for other electrical systems.
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I don't have time right now to look to see if there is a minimum GEC size there.
You can use this index to check the OSHA sections. Subpart S is like a mini-NEC and it looks like some of the wording is word for word from the NEC.
 
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nunu161

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not sure off hand what article it is in the code but a #6 CU is the largest conductor that shall be taken to a single ground rod due to the fact that a ground rod could only handle the amount of electrons the #6 will carry
 
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xman1970

Member
Grounding Electrode Conductor.......Range Calcs

Grounding Electrode Conductor.......Range Calcs

To my knowledge the grounding electrode conductor shall be sized per Table 250.66 per 250.24 (D) Is there someone that could possibly help me with some range calcs, I am a little confused about when to use Col B and Col C.

Thanks,

Jon
 
infinity

infinity

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xman1970 said:
To my knowledge the grounding electrode conductor shall be sized per Table 250.66 per 250.24 (D) Is there someone that could possibly help me with some range calcs, I am a little confused about when to use Col B and Col C.

Thanks,

Jon
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Jon, if you want to ask some questions about range calculations you should start a new thread. Click on a forum topic and then click the red new topic or question button. :)
 
roger

roger

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nunu161 said:
not sure off hand what article it is in the code but a #6 CU is the largest conductor that shall be taken to a single ground rod due to the fact that a ground rod could only handle the amount of electrons the #6 will carry
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To be correct, the conductor to a rod "shall not" be required to be larger than a #6, you could run any larger conductor if wasting money is not a concern, see 250.66(A)

Roger
 
wirebender

wirebender

Senior Member
Location
North Central Texas
nunu161 said:
not sure off hand what article it is in the code but a #6 CU is the largest conductor that shall be taken to a single ground rod due to the fact that a ground rod could only handle the amount of electrons the #6 will carry
Click to expand...

I'm sorry, I was not clear with my question.:cool:

I was asking if that is actually an OSHA requirement.
 
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