wyoming journeyman test question?

[cpeters9]

There is 3 12 awg thw copper cond. in the same raceway, temp70'c. Max allowable ampacity of conductors..
1. 7.5
2. 8.2
3. 20
4. 25

 

[raider1]

The answer is #2

The key to the question is the 70 deegrees C. The correction factor for 70 degrees C is .33. So if you take the allowable ampacity of the THW conductor at the 75 degree column (25) and multiply it by the correction factor of .33 because of ambient temperature of 70 degrees C you come up with 8.25.

Chris

 

[finhead]

The author of that question should have included 26.25 as one of the possible answers.

 

[infinity]

The author of that question should have included 26.25 as one of the possible answers.

Why?

BTW, I agree with Chris.

 

[finhead]

Because 26.25 would have been the answer selected by someone assuming when they saw 70 degrees that the units of measurement were fahrenheit

 

[raider1]

Because 26.25 would have been the answer selected by someone assuming when they saw 70 degrees that the units of measurement were fahrenheit

But the original post indicated "temp70'c." I would have a hard time seeing some one using 70 degrees fahrenheit when it was indicated "C". Also most of the time when using the NEC we are dealing with Celsius.


Chris

 

[finhead]

Chris

I agree with what you say, and I can only speak for myself that when I saw the 70 I immediately thought fahrenheit.