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Monday, July 31, 2017

Question:

Hello, I am interested in getting answers about load calculations for car chargers I see that in the NEC 625.14 is missing.... I have read that was a misprint and 625.41 is the correct references code, the aforementioned section only seems to refer to the equipment supplying the load it does not seem to contain calculation requirements just seems to indicate a rating of continuous..

My question is in regards to feeder and service calculations when adding loads to serve car chargers what demand factors can be applied for standard or optional calculations. As far as I can tell from reading the NEC there is no specific section referencing this.

Thank you and I appreciate any help

Oliver Allen

A

Answer:

Hey Oliver thanks for your question. The wording in 625.14 was moved to 625.41 in the 2014 NEC as part of the reorganization of that Article. It was also incorrectly referenced in 220.3 but that was corrected by errata for the 2014 NEC. You are correct it is considered to be a continuous load as stated in 625.42 so 125% is the minimum size. There is no specific demand factor but if an automatic load management system is used that can determine the maximum load.

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