UL 414

Abstract

These requirements cover meter sockets for use with: <br>a) Watthour and similar meters; <br>b) Test switches; <br>c) Metering transformer cabinets; and <br>d) Metering transformer cabinet interiors <br>for installation in accordance with the National Electrical Code, NFPA 70. <br>Meter sockets are marked with a continuous duty ampere rating and may in addition have a maximum use (intermittent) ampere rating of 125 percent or less of the continuous duty ampere rating. <br>A meter socket, as covered by these requirements, is an assembly of wiring terminals and jaw type contacts for one or more plug-in watthour meters in an enclosure having provisions for securing the meter to the socket. <br>Some meter sockets may be housed in a metal pedestal enclosure intended for mounting on a concrete slab or in a metal post enclosure intended to be sunk in the ground with or without concrete poured around the post at ground level and either self-supported or intended for separate support. Such posts or pedestals are not intended to serve as the sole support of masts for overhead wiring. <br>Some meter sockets may be intended for mounting on a mounting post or pedestal for distribution equipment. <br>As covered by these requirements, a meter socket does not include: <br>a) A meter, <br>b) An overcurrent device, <br>c) An instrument transformer, <br>d) An arcing or switching part, or <br>e) A similar component. A meter socket does not have provision for installation of instrument transformers within the meter socket enclosure. <br>These requirements cover meter sockets rated: <br>a) 300 volts alternating current or less, or 600 volts alternating current and <br>b) 400 amperes maximum per meter position. <br>These requirements cover metering transformer cabinets and metering transformer cabinet interiors rated maximum 6000 amperes at maximum 600 volts. <br>As covered by these requirements, a metering transformer cabinet or metering transformer cabinet interior does not include the current transformers.