bbrowntd
New member
- Location
- Houston, Tx
The Minimum neutral demand on an apartment service for eleven-8 kw ranges would be?
Neutral Demand
- Thread starter bbrowntd
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qcroanoke
Sometimes I don't know if I'm the boxer or the bag
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- Roanoke, VA.
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- Sorta retired........
You tell us. and tell us how you came up with the answer.
xformer
Senior Member
- Location
- Dallas, Tx
- Occupation
- Master Electrician
hmy:
Suppose it is a 3 phase 4 wire supply. Out of 11 nos 8kW ranges, assume 9 nos are equally distributed, 3 nos in parallel in each phase. If the remaining two are also in parallel in any one phase, the neutral current is equal to 2 times the 8kW range rated current. But if the remaining 2 nos are one in each of any two phases. the current in the neutral equal to the 8kW range rated current.
So shall we take the 8kW range rated current as the minimum neutral demand?
So shall we take the 8kW range rated current as the minimum neutral demand?
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Barbqranch
Senior Member
- Location
- Arcata, CA
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- Plant maintenance electrician Semi-retired
Isn't the neutral current for the ranges 0? The overall apartment neutral current would be determined by facts not in evidence.
xformer
Senior Member
- Location
- Dallas, Tx
- Occupation
- Master Electrician
What does "nos" mean?
xformer
Senior Member
- Location
- Dallas, Tx
- Occupation
- Master Electrician
By nos, I meant numbers. Delete nos if it causes any confusion.
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- Licensed Electrician
That fails to make what you are trying to communicate any clearer.
- Location
- Placerville, CA, USA
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- Retired PV System Designer
A range may run some elements from line to neutral for low power, although most these days use proportional control instead.
So there may be a neutral load for more than just fan and clock, but it will be less than the full power load current.
Tapatalk!
Even if a range has 0 neutral current, still have to size the neutral conductor to not less than 70 percent ampacity of the circuit rating. 220.61(B)(1) also permits 70 percent factoring for service and feeder neutral load.
The OP's question asks for minimum neutral demand. Consideration for any other loads would just make the neutral load greater.
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