But where???

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831

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South Jordan, Utah
Where in tarnation (in the NEC) is the 80% breaker loading language??? We all know it, and therefore never need to refer back to it and therefore dummies like me forget where it is!!!
 
Are you thinking about "continuous loads" and circuits "rated 125% of continuous loads"?

Look at 210.19A and 210.20

steve
 
There is no "80% breaker loading language," and that is why you did not find it. Steve has it right. Specifically, the language in 210.20(A) is essentially the same as saying you can only load a breaker to 80%, if the load is all classified as "continuous." But it also says you can load a breaker to 100%, if the load is all classified as "non-continuous."
 
831, note that when we are using 125% that it is the the inverse of 80%

Roger
 
Thanks all.

This is for sure a continuous load situation. I've basically got to work backward; I have a 1600A breaker to load and I've got to make sure I'm less than 1280. So I've got to create a shopping list of "stuff" the owner can load on that breaker before we need to find another 480 feeder or go to 4160.
 
georgestolz said:
You seriously have a 1200A continuous load?
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The client says that (4) 200HP pumps could run consecutively and there are other loads on the bus too. Obviously, the pumps will have to be controlled to start separately, but thats another matter.

I don't know the nameplate current of the motors so I'm just using 430.250 for now.
 
Remember that a continuous load is a load that lasts for three-hours or more. If the pumps cycle on and off according to demand, they are not continuous. Equipment controlled by a thermostat is usually not considered continuous. Other than commercial lighting: many, many loads (if not most) are non-continuous.
 
haskindm said:
Remember that a continuous load is a load that lasts for three-hours or more. If the pumps cycle on and off according to demand, they are not continuous. Equipment controlled by a thermostat is usually not considered continuous. Other than commercial lighting: many, many loads (if not most) are non-continuous.
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Trust me... these are continuous!
 
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