I have a service with 20 elevators, HVAC motor loads, lighting, and general receptacles. I find it unlikely that all elevators will operate simultaneously. Given this, can NEC section 220-21 be applied to the elevators for sizing the main service OCPD? As a basis, I would like to use the factors given in table 620-14? I know this table is allowed for feeders, but could it be used as a basis for a diversity factor for sizing the service OCPD?
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Elevator OCPD Sizing Criteria
- Thread starter eh3101
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charlie tuna
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Re: Elevator OCPD Sizing Criteria
article 620.14 and table 620.14 covers demand factors for elevators. since this section is specified "for elevators" i think it overrides 220.21.....
article 620.14 and table 620.14 covers demand factors for elevators. since this section is specified "for elevators" i think it overrides 220.21.....
Re: Elevator OCPD Sizing Criteria
If so, can the demand factors in 620-14 be applied when calculating the main service OCPD, or am I still required to use the largest elevator OCPD size plus all of the other elevator FLA when calculating the size? It seems that the latter would result in an extremely oversized service OCPD, considering the quantity of elevators operating intermittantly.
If so, can the demand factors in 620-14 be applied when calculating the main service OCPD, or am I still required to use the largest elevator OCPD size plus all of the other elevator FLA when calculating the size? It seems that the latter would result in an extremely oversized service OCPD, considering the quantity of elevators operating intermittantly.
It is a good question.
I think Table 620.14 will give you Demand factor for sizing feeder and load calculation. But how to size the overcurrent protection device is not defined. Elevators don't work as other pumps (motor type) do. I didn't see any description on how to size MOCP for grounp elecvators in NEC. But if you size it as per 430, it will be very big, but it will not hurt anybody except the person who pay for it.
Anybody can answer this question? Thanks.
I think Table 620.14 will give you Demand factor for sizing feeder and load calculation. But how to size the overcurrent protection device is not defined. Elevators don't work as other pumps (motor type) do. I didn't see any description on how to size MOCP for grounp elecvators in NEC. But if you size it as per 430, it will be very big, but it will not hurt anybody except the person who pay for it.
Anybody can answer this question? Thanks.
altonyjames
New member
can you write the formula for 3 elevators 480 volteh3101 said:If so, can the demand factors in 620-14 be applied when calculating the main service OCPD, or am I still required to use the largest elevator OCPD size plus all of the other elevator FLA when calculating the size? It seems that the latter would result in an extremely oversized service OCPD, considering the quantity of elevators operating intermittantly.
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