Dwelling unit service load- continuous or not?

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david luchini said:
You do not need to apply 125%, IMO. I would not consider any of the dwelling unit loads to be continuous.
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Seems reasonable to me, but I am very surprised the NEC doesn't explicitly say whether dwelling unit calcs are subject to continuous or non-continuous load limitations. Seems like a gaping hole.
 
greenspark1 said:
Seems reasonable to me, but I am very surprised the NEC doesn't explicitly say whether dwelling unit calcs are subject to continuous or non-continuous load limitations. Seems like a gaping hole.
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It seems to me that the NEC doesn't explicitly say that any type of load is continuous or non-continuous. It's up to you to decide that.

(The NEC does tell you to consider several types of branch circuit loads as continuous for the purpose of branch circuit conductor sizing, but that's a different issue.)
 
greenspark1 said:
I have my dwelling unit service load calculated per 220.82 as 180A. Can I use a 200A service or do I need to apply 125% = 225A?
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You would never (well almost never I guess) call the entire service load continuos.

You would pick and choose which specific loads were continuos and include them at 125% in your calculations.

One item in many homes the NEC tells us to consider continuos is storage type electric water heaters.
 
david luchini said:
It seems to me that the NEC doesn't explicitly say that any type of load is continuous or non-continuous. It's up to you to decide that.

(The NEC does tell you to consider several types of branch circuit loads as continuous for the purpose of branch circuit conductor sizing, but that's a different issue.)
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Funny, I have always thought this as well, then I stumbled upon Art 422-13. :)

Never mind, didn't read your second sentence completely :eek:
 
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