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Neutral Conductor Sizing (NEC2023)

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A

Abraham V

Member
Location
MN, USA
Occupation
Student
Reviewing Example D2(a). When calculating feeder neutral load, why are the water heater and space heater not counted? Why is the dishwasher counted?
 
infinity

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
Without seeing the calculation I would guess that the two types of heaters do not have a neutral as they are 240 volt loads. Dishwashers are typically 120 volts.
 
A

Abraham V

Member
Location
MN, USA
Occupation
Student
infinity said:
Without seeing the calculation I would guess that the two types of heaters do not have a neutral as they are 240 volt loads. Dishwashers are typically 120 volts.
Click to expand...
The question says, "2.5 kW water heater, 1.2 kW dishwasher, 9 kW of electric space heating installed in five rooms..." along with the rest of the loads that are taken into account. I'm looking for something to specifically tell me whether each is a 240 V or 120V load. I guess I just need time and familiarity.

Thanks!
 
E

Elect117

Senior Member
Location
California
Occupation
Engineer E.E. P.E.
Abraham V said:
The question says, "2.5 kW water heater, 1.2 kW dishwasher, 9 kW of electric space heating installed in five rooms..." along with the rest of the loads that are taken into account. I'm looking for something to specifically tell me whether each is a 240 V or 120V load. I guess I just need time and familiarity.

Thanks!
Click to expand...

They didn't say it, but those are assumed to be 240V loads. Or at least that is what the problem assumed.

Good Catch.
 
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