electric demand in kw
- Thread starter ronwatson
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charlie
Senior Member
- Location
- Indianapolis
Re: electric demand in kw
Ron, that is correct assuming the 1200 amperes is the actual demand and not the service size. This is also assuming unity power factor. If the 1200 amperes is measured amperes, the result is in kVA.
Ron, that is correct assuming the 1200 amperes is the actual demand and not the service size. This is also assuming unity power factor. If the 1200 amperes is measured amperes, the result is in kVA.
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: electric demand in kw
May I ask for the purpose of your question? Is this a general conversation about the relationship between V, I, A, W, VA, VAR, and PF for a 3-phase system? If so, then the two earlier posts provide your answer. But are you instead looking into the size of a service (or perhaps an emergency generator) for a specific project? If so, then we need to discuss the service calculation process given in NEC Article 220.
May I ask for the purpose of your question? Is this a general conversation about the relationship between V, I, A, W, VA, VAR, and PF for a 3-phase system? If so, then the two earlier posts provide your answer. But are you instead looking into the size of a service (or perhaps an emergency generator) for a specific project? If so, then we need to discuss the service calculation process given in NEC Article 220.
Re: electric demand in kw
I have a project that we are developing in Colorado. The utility company has an application form that must be complete to apply for service. I have a 277/480v, 3 phase with a panel size of 1600amp, system.My total Hp is 1236. There is a space on the application for me to input the electric demand in kW. The one-line diagram does not have this information or I can't find it.
Ron
I have a project that we are developing in Colorado. The utility company has an application form that must be complete to apply for service. I have a 277/480v, 3 phase with a panel size of 1600amp, system.My total Hp is 1236. There is a space on the application for me to input the electric demand in kW. The one-line diagram does not have this information or I can't find it.
Ron
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: electric demand in kw
If the utility company is asking for that information, I believe that they want the results of your service load calculation, per Article 220, as I mentioned earlier. They base their choice of service transformer on the results of this calculation. Just knowing the HP of the motors does not give them the complete picture. Just giving them the size of the service panel (I can?t tell if this is 1600 or 1200, since you used both numbers) is of no value whatsoever. You need to know the total service load. Have you performed an Article 220 service calculation before?
If the utility company is asking for that information, I believe that they want the results of your service load calculation, per Article 220, as I mentioned earlier. They base their choice of service transformer on the results of this calculation. Just knowing the HP of the motors does not give them the complete picture. Just giving them the size of the service panel (I can?t tell if this is 1600 or 1200, since you used both numbers) is of no value whatsoever. You need to know the total service load. Have you performed an Article 220 service calculation before?
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