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-   -   Grounding sub-panel at pool house (http://www.diychatroom.com/f18/grounding-sub-panel-pool-house-114543/)

CraigMW 08-18-2011 07:14 PM

Grounding sub-panel at pool house
 
My read of the NEC is that sub-panels should never have the neutral and ground bonded together. I also understand that separate structures require their own grounding rod. So, here's my issue:

We have a pool-house roughly 100' from the main house. I have already run 1.5" grey PVC electrical conduit in a 125' trench containing four 6 gauge conductors with the intent of setting up a sub-panel. I believe based on the wire gauge and temperature ratings, I can use a 60 or 65A 2P breaker for this run to a main-lug sub-panel with separate grounding and neutral terminal strips. The issue I don't understand is do I really need to use a grounding rod at the pool house? If so, do I connect it into the grounding bar of the sub-panel? Do I still need to bring ground in from the main panel's grounding bar, or do I not need to use the 6 ga ground wire I have in the conduit? My sense is that even with a separate ground rod at the pool house, it would be best to connect the two grounding rods together with that 6 ga wire. I really don't understand the purpose of having a separate grounding rod at the pool house.

Thanks for any and all info.

electures 08-18-2011 07:18 PM

Detached structure requires a ground rod. #6 neutral has to be white entire length. 60a on #6 unless all terminations are 75C. Ground rod connects to the ground bar at subpanel along with ground wire from main panel.

CraigMW 08-18-2011 07:22 PM

Wow, that was quick! Thanks for the info.

electures 08-18-2011 07:24 PM

Quote:

Originally Posted by CraigMW
Wow, that was quick! Thanks for the info.

Welcome!

CraigMW 08-18-2011 07:25 PM

BTW, regarding "60a on #6 unless all terminations are 75C";
Does this mean that if terminators are 75C or above, that I can go with higher ampacity breaker?

Also, the four wires in the conduit are red and black (for each side of 220V), white (neutral) and green (ground).

electures 08-18-2011 07:29 PM

Quote:

Originally Posted by CraigMW
BTW, regarding "60a on #6 unless all terminations are 75C";
Does this mean that if terminators are 75C or above, that I can go with higher ampacity breaker?

Also, the four wires in the conduit are red and black (for each side of 220V), white (neutral) and green (ground).

If all terminals are 75C then the higher ampacity can be used. Colors are good also.

brric 08-18-2011 07:53 PM

Quote:

Originally Posted by CraigMW (Post 710374)
My read of the NEC is that sub-panels should never have the neutral and ground bonded together. I also understand that separate structures require their own grounding rod. So, here's my issue:

We have a pool-house roughly 100' from the main house. I have already run 1.5" grey PVC electrical conduit in a 125' trench containing four 6 gauge conductors with the intent of setting up a sub-panel. I believe based on the wire gauge and temperature ratings, I can use a 60 or 65A 2P breaker for this run to a main-lug sub-panel with separate grounding and neutral terminal strips. The issue I don't understand is do I really need to use a grounding rod at the pool house? If so, do I connect it into the grounding bar of the sub-panel? Do I still need to bring ground in from the main panel's grounding bar, or do I not need to use the 6 ga ground wire I have in the conduit? My sense is that even with a separate ground rod at the pool house, it would be best to connect the two grounding rods together with that 6 ga wire. I really don't understand the purpose of having a separate grounding rod at the pool house.

Thanks for any and all info.

Seperate structure requires a min disconnect.

electures 08-18-2011 08:31 PM

Quote:

Originally Posted by brric
Seperate structure requires a min disconnect.

What about six motions of the hand?

Jim Port 08-18-2011 08:55 PM

Quote:

Originally Posted by electures (Post 710460)
What about six motions of the hand?

Doin the hand jive?

electures 08-18-2011 09:03 PM

Quote:

Originally Posted by Jim Port

Doin the hand jive?

Baby. Lol

CraigMW 08-19-2011 12:22 AM

Quote:

Originally Posted by brric (Post 710417)
Seperate structure requires a min disconnect.

I'm not sure if I follow. Do you mean that the sub-panel requires a main breaker and not main lug? Or alternatively, that the lines coming into the sub-panel require a switch? I thought the breaker in the main panel would cover this?

brric 08-19-2011 07:19 AM

Quote:

Originally Posted by CraigMW (Post 710559)
I'm not sure if I follow. Do you mean that the sub-panel requires a main breaker and not main lug? Or alternatively, that the lines coming into the sub-panel require a switch? I thought the breaker in the main panel would cover this?

You need to be able to shut off all power to the structure with 6 or fewer motions of the hand. If your panel will have more than 6 circuits then the panel needs a main breaker.

CraigMW 08-19-2011 10:08 AM

Okay, that makes sense.


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