I have a building with a 400 amp 480 volt service and one meter on the building going to two 200 amp panel on inside of bld. Need to increase another 400 amps can I get away with another set up as before ( the 2 - 200amps parallel ) or must i build a 800 amp service ,,,,further more must I have a disconnect on the line side of the meter I thought it was a new rule ? stumped here need help with the load design.
max number of meters on one bld. ( services )
- Thread starter 69jag
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mdshunk
Senior Member
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- Right here.
Re: max number of meters on one bld. ( services )
Your serving utility often will dictate that for you. You can't (shouldn't) add that much load without consulting them as one of your first steps. Chances are that you have a CT service anyhow, so buliding a completely new 800 amp service shouldn't be req'd. Just more or bigger conductors through the utility's CT's.
Your serving utility often will dictate that for you. You can't (shouldn't) add that much load without consulting them as one of your first steps. Chances are that you have a CT service anyhow, so buliding a completely new 800 amp service shouldn't be req'd. Just more or bigger conductors through the utility's CT's.
david
Senior Member
- Location
- Pennsylvania
Re: max number of meters on one bld. ( services )
The requirement for a non-fusible disconnect ahead of a line voltage meter is a Utility Co. requirement check with your local utility.
The requirement for a non-fusible disconnect ahead of a line voltage meter is a Utility Co. requirement check with your local utility.
Re: max number of meters on one bld. ( services )
The number of meters that you can have can also be more of a zoning issue. As long as both services are grouped together and run off of the same power source they can be considered to be 1 service.
Some utility companies will allow two 400 amp services using class 320 meters as that is simpler and cheaper than CT metering.
By the way, building a 400 amp service using a pair of 200 amp circuit breakers or fusible switches is usually more economical than using a single 400 amp device. I have seen 1200 amps done using 6 200 amp fusible switches.
Also, 200 amp class J time delay fuses are actually cheaper than 200 amp 600 volt class RK5 if you do some shopping around. Also, check to see if you need to use 200 amp or 400 amp class J fuses to boost up the interrupting rating of downstream circuit breakers. In some instances you would need to use 200 amp or smaller class J fuses.
The number of meters that you can have can also be more of a zoning issue. As long as both services are grouped together and run off of the same power source they can be considered to be 1 service.
Some utility companies will allow two 400 amp services using class 320 meters as that is simpler and cheaper than CT metering.
By the way, building a 400 amp service using a pair of 200 amp circuit breakers or fusible switches is usually more economical than using a single 400 amp device. I have seen 1200 amps done using 6 200 amp fusible switches.
Also, 200 amp class J time delay fuses are actually cheaper than 200 amp 600 volt class RK5 if you do some shopping around. Also, check to see if you need to use 200 amp or 400 amp class J fuses to boost up the interrupting rating of downstream circuit breakers. In some instances you would need to use 200 amp or smaller class J fuses.
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