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Dwelling unit service calculations

G

gcushman

Member
Location
04071
Occupation
electrician/instructor
Why does the NEC not show a value for the required bathroom circuit @ 1500 VA , similar to the laundry circuit? (Informative Annex D)
 
C

CoolWill

Senior Member
Location
Alabama
Occupation
Electrical Contractor
Probably because this circuit is almost never loaded. It's so infrequently loaded as to simply not matter in calculations. Besides, the rest of the service calcs are so overblown that there's plenty of wiggle room.
 
Dennis Alwon

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
gcushman said:
Why does the NEC not show a value for the required bathroom circuit @ 1500 VA , similar to the laundry circuit? (Informative Annex D)
Click to expand...
Even if it did it would add so little to the calculation. It adds about 525 watts to the demand so you can see the size of the service would not change in almost every instance
 
M

mauk

Member
Location
NY
Occupation
Electrical Engineer
It's already included in the 3 VA/SF unit load for dwelling units.
 
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