Hello everyone,
I am currently using the 2023 Electrical Exam Preparation book to brush up on my knowledge before my exam. I ran into an issue where the book, as well as annex D2a, as well as some short googling, all say that the calculation for the reduced neutral, as permitted by 220.61, requires me to use the Standard Method of calculation found in part III of article 220. The problem is, the final sentence of section 220.82(A) claims:
"Feeder and service entrance conductors whose calculated load is determined by this optional calculation shall be permitted to have the neutral load determined by 220.61"
It seems like the exam prep book is wrong in saying that the neutral MUST be sized using the Standard Method. The annex D2a is also flip flopping between the Standard Method and the Optional method to calculate the conductors for 1 load.
Which one do use? Can I size the neutral using the Optional Method? It would make sense to size the neutral using either method but sticking to one.
Thanks.
I am currently using the 2023 Electrical Exam Preparation book to brush up on my knowledge before my exam. I ran into an issue where the book, as well as annex D2a, as well as some short googling, all say that the calculation for the reduced neutral, as permitted by 220.61, requires me to use the Standard Method of calculation found in part III of article 220. The problem is, the final sentence of section 220.82(A) claims:
"Feeder and service entrance conductors whose calculated load is determined by this optional calculation shall be permitted to have the neutral load determined by 220.61"
It seems like the exam prep book is wrong in saying that the neutral MUST be sized using the Standard Method. The annex D2a is also flip flopping between the Standard Method and the Optional method to calculate the conductors for 1 load.
Which one do use? Can I size the neutral using the Optional Method? It would make sense to size the neutral using either method but sticking to one.
Thanks.
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