Sub panel help

[badams14]

Any one know what size wire I will need for a 210' run of direct burial to a 100A sub panel? Main 200A panel is in basement, underground to new pole barn from there. Thanks in advance.


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[wyliesdiesels]

#1 CU or 1/0 AL...

Closest thing youre gonna get to that for direct burial is 2/0 MHF(mobile home feeder)...

 

[badams14]

Thanks


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[pattenp]

You can use type RHH/RHW-2/USE wire if doing direct bury and make up your 4 wires if you don't want the assembled MHF cable. As said the closest size of MHF is 2/0, so making up the run from individual wires you should be able find the #1-Cu or #1/0-Al to do so. Remember the EGC can be smaller than the current carrying conductors.

 

[badams14]

I have had a few local electricians tell me I should use 1/0 copper on the hot legs, #2 on the neutral and #6 on the ground. Sound right? I do all the work myself but the last thing I want is to do it again because an inspector has a problem with it. Thanks.


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[Aceman]

You're getting ahead of yourself.

First, how did you come up with needing a 100 amp panel? What kind of equipment will be in your garage? HVAC?

 

[badams14]

HVAC, welder, lathe, drill press and maybe a milling machine. I do not plan on using 100A but I would like the option down the road if necessary.


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[davidlee]

I ran a 4 wire direct burial aluminum wire number of years ago and it did not hold up well. I then ran copper in conduit and it has lasted. I would not recommend direct burial if something happens there is no fix, just dig it up and replace it.

 

[Norcal]

I have had a few local electricians tell me I should use 1/0 copper on the hot legs, #2 on the neutral and #6 on the ground. Sound right? I do all the work myself but the last thing I want is to do it again because an inspector has a problem with it. Thanks.


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The 6 AWG grounding conductor would not be in compliance with 250.122(B). as the ungrounded conductors has been increased from the minimum conductor size required for the installation.

 

[theoldwizard1]

HVAC, welder, lathe, drill press and maybe a milling machine. I do not plan on using 100A but I would like the option down the road if necessary.

Unless you plan on running 3 or more of those at the same time, you are way over kill. 60A is more than enough for a 1 man operation.

You would save a bundle by downsizing on wire by downsizing, especially for that length. Remember, you can install a 100A panel and feed it with smaller wire as long as the wire is protected by by a 60A breaker in your main.

 

[badams14]

How big should of wire should I use instead of the #6?


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[wyliesdiesels]

The 6 AWG grounding conductor would not be in compliance with 250.122(B). as the ungrounded conductors has been increased from the minimum conductor size required for the installation.

Damnit i always forget about the illogical 250.122(b)...