ground rods

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nuvi660

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Installed a 100 amp sub panel at a residential home to pool house and the inspector is insisiting on installing a main breaker and 2 ground rods at location. Never in 25 years have i heard of such a request! Is there something that has changed that i'm not up on!! thank you!
 
250.32(A) requires a grounding electrode system at all separate buildings or structures.

225.31 requires a disconnecting means of some type at all separate buildings or structures.

The disconnecting means must be located per 225.32 and must comply with 225.33, 225.34, 225.35, 225.36, 225.37, 225.38, 225.39 and 225.40.


None of this is new at all.
 
And this....

250.56 Resistance of Rod, Pipe, and Plate Electrodes.
A single electrode consisting of a rod, pipe, or plate that does not have a resistance to ground of 25 ohms or less shall be augmented by one additional electrode of any of the types specified by 250.52(A)(4) through (A)(8). Where multiple rod, pipe, or plate electrodes are installed to meet the requirements of this section, they shall not be less than 1.8 m (6 ft) apart.

FPN: The paralleling efficiency of rods longer than 2.5 m (8 ft) is improved by spacing greater than 1.8 m (6 ft).
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But it is tied in with the system from the house. Its not like your creating a seperate system. If that was required then you wouldnt have a ground from the house out to the shed with the feeders.
 
Flex said:
But it is tied in with the system from the house. Its not like your creating a separate system.
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Very true.


If that was required
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It is required


then you wouldn't have a ground from the house out to the shed with the feeders.
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The presence of the equipment grounding conductor from the supply has absolutely nothing to do with the requirement for grounding electrodes at the separate building or structures.

Your home service is already connected to hundreds of grounding electrodes through the power company grounded conductor, that does not eliminate the requirement for grounding electrodes at your home.
 
nuvi660 said:
If a sub panel in run to a detached garage is ground rods required at this location.
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For a feeder supplying a detached garage you are required to provide some type of electrode(s). It could any kind of electrode listed in 250.52.

If it happens to be a new garage that has a foundation containing 20' or more of connected 1/2" re-bar you would be required to use that as the grounding electrode. 250.50 / 250.52(A)(3).
 
Dennis Alwon said:
the pool panel does not necessarily need a main breaker if you meet the 6 disconnect rule.
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The panel would have to be service rated without a main and while I have seen such panels for large commercial use I don't think you will find a 'load center' that has a service rating without a main. Of course you could use a service rated disconnect ahead of the main lug panel. :smile:
 
iwire said:
The panel would have to be service rated without a main and while I have seen such panels for large commercial use I don't think you will find a 'load center' that has a service rating without a main. Of course you could use a service rated disconnect ahead of the main lug panel. :smile:
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Every sub panel I use says suitable for service equipment. In fact, I have not seen a panel that does not say suitable for service equipment-- at least not recently.
 
iwire said:
Dennis can you give us a model or a link that says it service rated without a main breaker?
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Bob I will have to check on this... For years it was common practice to use a 12 cir. ML wp panel as a main service disconnect. These panel had 6 DP breakers
 
Dennis Alwon said:
Bob I will have to check on this... For years it was common practice to use a 12 cir. ML wp panel as a main service disconnect. These panel had 6 DP breakers
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I know a lot of things that where common but ...... :grin:

I just went looking at GE stuff and it looks like many of their load centers can be both main lug only and service rated. Kind of wish I knew that when arguing with Mike W about it on this forum. :smile:
 
iwire said:
I just went looking at GE stuff and it looks like many of their load centers can be both main lug only and service rated. Kind of wish I knew that when arguing with Mike W about it on this forum. :smile:
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Well I am glad you found it because you had me doubting my memory. I actually use GE but I believe all the resi panel manufacturers are set up this way.
 
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