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This is my first sub panel and my electrician is in the hospital and I can wait no more. I'm in the process of wiring up a 60a sub panel from my 100 amp main. I will be running one 40A 240 circuit and one 20a 120 circuit. My run is 75 feet. I ran #6 thwn in schedule 40 18 inches deep. the ground And neutral are 10awg. I know the ground is ok but questions are arising about the neutral. I had three people( place I bought wire from, home depot electrical guy, one electrician). I go and see my guy in the hospital and he says no go on the 10awg neutral. I ran two 8 foot ground rods 7 feet apart. my neutral is isolated from my ground at the sub. I've searched and searched and some say yes up two sizes is ok and others say no at least 8awg. all my wire has been pulled and secured in sub just have not physically hooked her up at the main. The job is not being inspected but I've done everything else to code so why skimp now. should I use the 10awg as a fish and pull something heavier for my run or am I safe? the 40amp is powering ballasts. the 120 is powering fans and pumps. sorry for the long read I'm just stumped. thank you to all with the knowledge I seek. :)
 

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It's common to undersize the neutral by one wire size, not two...that is what I would do in your situation, and it is what I have done in the past.
 

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Minimum #8 copper.

You're right, why skimp? You can use the #10 as a pull wire and pull in #6. You'll pay around $23 for #8 and $36 for the #6 @ 75'.
 

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How big is your conduit? That's another consideration when deciding to pull #6 or #8.
The circuit amperage is what determines the wire size...not the size of the conduit. If the conduit isn't adequate for the proper wire size either change the conduit or downsize the circuits amperage.:wallbash:
 

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The circuit amperage is what determines the wire size...not the size of the conduit. If the conduit isn't adequate for the proper wire size either change the conduit or downsize the circuits amperage.:wallbash:

I'm aware of that fact. It was suggested to the OP to use 6ga wire. The size of the conduit is a factor that determines the ease of which to pull the wire, using the 10ga as a fish or not. Anything less than 1", I would go with 8ga and not the 6ga. No sense making your pull harder than it needs to be.
 
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