Acceptable service for Multi-family dwelling

[jared albrecht]

I am designing a four plex dwelling for a client. on the site is a 120/208 3 phase power. i am questioning if i can use the 120/208 single phase as a service to the dwelling units. the client did say the usual 240 volt appliances will be ordered as 208 volt. any reference or input as to why or why not i can use the 120/208 volt system would be appreciated.

 

[masterinbama]

That would be up to your local utility

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[jared albrecht]

That would be up to your local utility

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there is a service already in place on the site. it is a 120/208v three phase. it is 1200 amps. the utility will not be involved in this connection.

 

[topgone]

there is a service already in place on the site. it is a 120/208v three phase. it is 1200 amps. the utility will not be involved in this connection.

Do you mean you own the 120/208 service?

 

[mhanson]

The Utility has provided 120/208v 3ph to your building. In my experience your sub feeds will be single phase alternating between phases to each unit.

 

[jared albrecht]

Do you mean you own the 120/208 service?

no, the client has an existing service on site and is connecting to a new 4 plex dwelling. no meters involved in the connection as there is already one meter at the before the 120/208 volt service. the owner assumes the power bill. i only need to know if it is acceptable to use this voltage

 

[jared albrecht]

The Utility has provided 120/208v 3ph to your building. In my experience your sub feeds will be single phase alternating between phases to each unit.

so it will be a 120/208 volt to the dwelling unit. that is acceptable by codes?

 

[masterinbama]

so it will be a 120/208 volt to the dwelling unit. that is acceptable by codes?

Yes, done all of the time.

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[mhanson]

absolutely, it is unlikely that a residential unit will have a need for 3ph power.

 

[topgone]

no, the client has an existing service on site and is connecting to a new 4 plex dwelling. no meters involved in the connection as there is already one meter at the before the 120/208 volt service. the owner assumes the power bill. i only need to know if it is acceptable to use this voltage

I was asking because it's rare for a residential service to need 3-phase! If your load is too big to give problems to the POCO, ask them first. I don't see a problem with code provisions, it's between you and the POCO.

 

[electrofelon]

the client did say the usual 240 volt appliances will be ordered as 208 volt.

There generally are not 208 and 240 resi appliances FYI ...they will all be the same and just have less wattage at 208. You can get water heaters with 5500 watt (at 240) elements which would be about 4200 at 208.