Hi all,

I recently took my NC limited exam and was perplexed by the following problem. It was asking (a couple of times) what the calculated loads were for dwelling units using the optional method. To paraphrase the question:

Given a dwelling unit with the following loads (hot water heater, dishwasher, dryer and 3 separately controlled electric heating units) with a

total of 18KVA (I don't recall the exact number), what is the calculated load.

I understood that one was supposed to take the sum of the VA/sq ft + laundry + 2 kitchen ckts, plus the sum of 4 or more fastened in place appliances, THEN apply the damand factors of 100% for the first 8KVA plus 40% of the remaining load. 220.82(B).

Then one is supposed to add the appropriate selection from 220.82(C)...heat and air to come up with a total load.

I don't understand how I was supposed to come up with the correct answer when they lumped the HVAC into the total given in the question. I tried to apply the demand factor to the numbers they gave, but still couldn't come up with an answer.

They did the same thing with a multi-dwelling unit too! Perhaps I got it right on the multiple-guess.

Am I correct in my application of the optional method? I'd like to clarify it if I can.

BTW, I passed!

Thanks

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