water heater ocpd
- Thread starter merle657
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jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Assuming this a tank storage WH 422.10 and 422.13. What is the make and model, never saw a beast like this.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Merle, welcome to the forum! 
What you described would require two separate circuits.
Are you sure it isn't "3000w upper, 3000w lower, 3000w total"?
What you described would require two separate circuits.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Merle, I am assuming this a homework question, if you post the question verbatim, we could be more helpful in helping you understand it.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
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.
broadgage
Senior Member
- Location
- London, England
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.
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.
- Location
- Massachusetts
I agree 100%
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