Metering (tariff)

Energy values computed from digital and/or analog inputs during variable periods and dedicated to energy measurement for billing purposes.

Metal Halide Lamp (MH)

An HID light source in which the arc tube’s primary internal element is Mercury Vapor in combination with Halides (salts or iodides) of other metals such as Sodium or Scandium.

Metal Enclosed (Switchgear)

An expression used by some manufacturers to describe a category of low voltage, 600 volt class switchgear equipment, where the circuit breakers are all enclosed in grounded, sheet-steel enclosures. Such enclosures normally are suitable only for indoor use

Metal Clad (Switchgear)

An expression used by some manufactures to describe a category of medium voltage switchgear equipment where the circuit breakers are all enclosed in grounded, sheet-steel enclosures. Such enclosures may be suitable for indoor use or may be enclosed in an