water heater ocpd

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what i am trying to figure out is would i use the ampacity of both (3000W and 6000W) heating elements or just the bigger of the two im really confused
 
Merle, welcome to the forum! :)

merle657 said:
what is the correct way i would figure ocpd on a water heater with a 3000w and a 6000w on a 240v circuit
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Are you sure it isn't "3000w upper, 3000w lower, 3000w total"?

What you described would require two separate circuits.
 
this is a hypothetical question i am just trying to find out the correct way to figure it out in an instance like this
 
A standard household water heater is marked 4500w for each element but the elements are never run at the same time. I have never seen a water heater with different element sizes.
 
In the case of theoretical example given, it would depend on the internal wiring of the water heater.
If the elements can never be energised at the same time, then consider only the larger one.
If both elements can be energised at the same time, then consider the total load of both.
In a real world case, the manufacturers instructions should be followed, in addition to the NEC.
 
broadgage said:
In the case of theoretical example given, it would depend on the internal wiring of the water heater.
If the elements can never be energised at the same time, then consider only the larger one.
If both elements can be energised at the same time, then consider the total load of both.
In a real world case, the manufacturers instructions should be followed, in addition to the NEC.
Click to expand...

I agree 100%
 
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