NEC Code questions

roy167 said:

View attachment 12644

XHHW can be found in 75C and 90 C insulation.  This problem may have been solved using previous years code. According to 2017 code, does wet location mean 75C insulation? I have not been able to find that.  

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roy167 said:

This is a thread to ask NEC code related questions. 

Example16: What is the ampacityto size the feeder conductor if it supplies the following two motors?
1.One 7.5-hp, 230V, single-phase motor
2.One 5-hp, 230V, single-phase motor
Ans: Table 430.248 gives 40 A and 28 A as individual FLC of the two motors. Per Article 430.24, the feeder must be sized to 40x125%+28 = 78 A.
Size the conductor for 75 C terminals: Ans. 4 AWG (85A)

I would think the feeder conductor should be sized for 60C since it is less than 100 amps and motor design codes are not given. Can someone verify? 

Click to expand...

roy167 said:

View attachment 12644

XHHW can be found in 75C and 90 C insulation.  This problem may have been solved using previous years code. According to 2017 code, does wet location mean 75C insulation? I have not been able to find that.  

Click to expand...