Residential Service for Off Peak, direct metered

[danno1202]

I am currently planning the installation of a residential service on a rural home. This will be a service that has two direct meters, one for the off peak power and one for the normal power. My power company requires that the meter pedestal be located at least 50' from the house. The off peak load will be an electrical thermal storage furnace and a 100 gallon water heater.
I will need to run a 200 amp service lateral for the off peak, and a 100 amp lateral for the normal power. Both laterals will be run out to the meter pedestal.
How do I determine the service wire sizes? I know this sounds like a dumb question, but am I allowed to use the reduced sizes for residential service wires in the code? It says something about serving the "entire load", so I'm thinking not. Or do I just go with 100 and 200 amp rated wires and that's it?
Thanks much.

 

[PetrosA]

I've never seen a pedestal service around here, but when we used to do off-peak services, there was a single drop to feed both services and a 60A cable in to the 240V off-peak (typically a four space panel) and usually just a 100A main panel. You would only have a dryer and water heater on the off-peak here. There also used to be a "heating" type of service with a reduced rate, but they were extremely rare.

 

[iwire]

I will need to run a 200 amp service lateral for the off peak, and a 100 amp lateral for the normal power. Both laterals will be run out to the meter pedestal.
How do I determine the service wire sizes? I know this sounds like a dumb question, but am I allowed to use the reduced sizes for residential service wires in the code? It says something about serving the "entire load", so I'm thinking not.

You nailed it, neither of those cables carry the full load of a dwelling unit so they must be sized 'normally'.

But how did you come up with 100 amps and 200 amps for each?

What is the actual calculated load of each?

Are there breakers at the pedestal?

At the house you will need to group the disconnects for these two supplies.

 

[danno1202]

The service loads were calculated in accordance with article 220. The off peak load consists of a 24.8 KW electric storage furnace and a 4.5 KW water heater, so I'm making that one 200 amps. The normal load for the rest of the house comes in at just under 22,500 VA, so I may have to bump that service up to 150 amps.
The pedestal is provided by the power company, so I'll have to find out if there are breakers in it.
The service disconnects will be the mains in the panels, which will be adjacent to each other.

You nailed it, neither of those cables carry the full load of a dwelling unit so they must be sized 'normally'.

But how did you come up with 100 amps and 200 amps for each?

What is the actual calculated load of each?

Are there breakers at the pedestal?

At the house you will need to group the disconnects for these two supplies.

 

[bob]

This will be a service that has two direct meters, one for the off peak power and one for the normal power. My power company requires that the meter pedestal be located at least 50' from the house. The off peak load will be an electrical thermal storage furnace and a 100 gallon water heater.

Why would the utility require the meter to be located at least 50 ft from the house.
Just curious.

 

[danno1202]

That's a good question but that's what they want. I'd much prefer it to be on the house, but they won't do it that way anymore. The utility is Itasca Mantrap in northern Minnesota.

Why would the utility require the meter to be located at least 50 ft from the house.
Just curious.