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What gauge wire do you need for 220V 60A power?

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βˆ™ 2010-12-15 23:55:42

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Answer for USA, Canada and countries running a 60 Hz supply service.THHN 6 gauge is rated at 75 amps at 240. I ran it through a 2 1/2' conduit and it works great. You will need a real wire puller to get it through though, this fishline or string stuff just won't pull 4 stands of 6 gauge around any corners at all.


I would recommend 6ga for runs under 75ft, 4ga for under 150, and 2 for under 225.


Ok #6 is good for 65 Amp @ 75degC. I know the table for thhn wire shows #6 is good for 75 Amp @ 90degC. But you can not use that column. You have to use the 75degC column. The reason for using the 75degC column is the terminations (wire lugs) (circuit breakers) (wire nuts) (etc.) are only rated 75degC. not 90degC. You have to use the weakest link as the max. If one of the terminals in the circuit were rated 60degC then #6 thhn wire would be good for 55amp @ 60degC. You must not run hotter than the rating!


(by - tbcguy) I am a Licensed Electrician, and have been in the trade for 22 yrs.

As mentioned above you Cannot use the 90degC column for the above mentioned reasons.

** Also note the 65amp rating is the maximum @ the 75degC column, but the STANDARD size "Breaker" is 60 amps, so you would drop down the rating of the 6 awg wire to 60a maximum load.


As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.




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βˆ™ 2010-12-15 23:55:42
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