3 phase question

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Yes, #6 THHN is rated for 75 amps. But 60 amps would be 80% of 75. So it's possible that was done on purpose depending on the continuous load that was on it.

Jason
 
Jberg73 said:
Yes, #6 THHN is rated for 75 amps. But 60 amps would be 80% of 75. So it's possible that was done on purpose depending on the continuous load that was on it.

Jason
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termination rating is likely going to be 75C which will limit ampacity to 65 amps.

As long as 100% of non-continuous load plus 125% of continuous load is not more then 65 amps you can protect 6 AWG with a 70 amp breaker. If the calculation comes to 66 amps you can still use the 70 amp breaker but will need to increase conductor to 4 AWG.

Now if your load is motor(s) you possibly see 90-125 amp breaker on 6 AWG in some instances, but the rules change for motors.
 
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