I have a commercial project with multiple tenants. Each tenant has a sub-meter for billing. The EC installed the tenant meters per manufacturer instructions. The Inspector told the EC that it violates the NEC and that he had to add a breaker on the MDP for power to all of the tenant meters.
2,000A, 3-phase service into the building with a single main breaker as the service disconnect. Utility meter outside. Several 400A branch breakers for tenant suites. A 400A sub-meter for each tenant. The sub-meter wiring diagram shows the power for the meter tapped onto the tenant feeder it is metering.
The Inspector required them to add a 15A/3P breaker in the MDP for the sole purpose to power these meters.
I never heard a code section cited by the Inspector. I'm assuming it is related to the tap rule which I have never understood. I have never had this come up on a project before. Most meter diagrams I've found online look similar to this one. Are the manufacturers violating the NEC or is this Inspector mistaken?
2,000A, 3-phase service into the building with a single main breaker as the service disconnect. Utility meter outside. Several 400A branch breakers for tenant suites. A 400A sub-meter for each tenant. The sub-meter wiring diagram shows the power for the meter tapped onto the tenant feeder it is metering.
The Inspector required them to add a 15A/3P breaker in the MDP for the sole purpose to power these meters.
I never heard a code section cited by the Inspector. I'm assuming it is related to the tap rule which I have never understood. I have never had this come up on a project before. Most meter diagrams I've found online look similar to this one. Are the manufacturers violating the NEC or is this Inspector mistaken?