SWITCHBOARD METERING

A custom-built switchboard is required for services over 800 amperes. Switchboard metering may also be used on 201-800 amp services, at the customer's option.

The switchboard will include the switchboard service section, current transformer (CT) mounting base, meter socket, provisions for a test switch, and means for locking the meter enclosure with independent access by the power company. The customer must submit one set of drawings to the power company for approval, prior to shipment of the switchboard from the manufacturer.

The point of delivery must be no more than 5 feet vertical or horizontal inside the building from the point of entrance. Locate the metering compartment on the supply side of the main switch or breaker, with the CTs in a CT compartment. The meter socket and test switch may be mounted on the CT compartment's hinged cover, or located remotely. The space below this compartment's barrier may be used as the main switch (breaker) compartment, or a load distribution compartment, or a bottom-fed terminating pull section.

The power company will own, provide, and install the meter and test switch.

CTs may be installed either by the customer or the power company. The power company is responsible for the wiring between the CTs and the meter.

 Mount each socket on the switchboard, or remotely, and connect it to the switchboard with approved conduit.

6-Terminal socket for single-phase services

13-Terminal socket for three-phase services  

Switchboard Meter Installation
A typical switchboard meter installation is shown below, with three options for locating the meter:
       ▪ Remotely mounted
       ▪ Flush with the panel
       ▪ Surface-mounted on the face of the panel