The equipment shall meter the entire three-phase electrical service used by the building. The watt transducer shall be of electronic type with high accuracy. The watt transducer shall utilize stable and high linearity multiplier. The pulse multiplier shall work based on PHW principle. Each pulse output shall be either dry contact or opto-isolated type.
Switches Specify heavy duty HD disconnect switches.
Thermal overload type switches may act as disconnect where used to protect small single phase motors. F. Transformers 1. Where possible, transformers and primary protective gear shall be specified in the prime building contract for single responsibility for power supply. Copper windings are required. No open aluminum windings are allowed.