60A sub- panel / 110-14(c)(1)?

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yngbutnot2dmb

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If I run a feeder from a breaker 60/70 deg.C rating to supply a 60A sub-panel with a main breaker 60/70 deg.C rating and I use a 90 deg.C rated conductor such as THHN would a #6 AWG based on the 75 deg.C column have suffecient ampacity or should I run #4 AWG based on the 60 deg.C column since its less than 100A? according to Art.110-14(C)(1)(a)(2 or 3)
Less than 100A or not, is not most new equipment rated at 60/70 deg.C and is this what is ment by temperature rating of terminal or connection.
any input would be helpful. I just want to be sure I,m teaching it right I'm a new teacher and I always like to play the safe side.
 
Re: 60A sub- panel / 110-14(c)(1)?

If the breaker and panel have 75C ratings, you may use the 75C col to size the conductor. No need to use the 60C col.
 
Re: 60A sub- panel / 110-14(c)(1)?

Most modern equipment of this type is rated for 75 degree C terminations. A wire has two ends. If both ends land at 75 degree rated terminals, then all is fine for the 75 degree ampacities.
 
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