UL 414-2007 pdf download

UL 414-2007 pdf download.Meter Sockets.
1 .2 Meter sockets are marked with a continuous duty ampere rating and may in addition have a maximum use (intermittent) ampere rating of 1 25 percent or less of the continuous duty ampere rating. 1 .3 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. 1 .4 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. 1 .5 Some meter sockets may be intended for mounting on a mounting post or pedestal for distribution equipment. 1 .6 As covered by these requirements, a meter socket does not include: a) A meter, b) An overcurrent device, c) An instrument transformer, d) An arcing or switching part, or e) A similar component. A meter socket does not have provision for installation of instrument transformers within the meter socket enclosure. 1 .7 These requirements cover meter sockets rated: a) 300 volts alternating current or less, or 600 volts alternating current and b) 400 amperes maximum per meter position. 1 .8 These requirements cover metering transformer cabinets and metering transformer cabinet interiors rated maximum 6000 amperes at maximum 600 volts.
4 Enclosure 4.1 An enclosure shall comply with the requirements of the Standard for Enclosures for Electrical Equipment, UL 50, unless modified by additional requirements as specifically described in this standard and shall be marked in accordance with 25.4.1 . 4.2 In a cast metal enclosure intended for one meter, there may be an indication of location in the rear wall for an additional conduit connection. This indication may be in the form of a breakout with a reduced thickness to not less than 0.020 inch (0.51 mm), but shall not be a knockout nor shall it be for more than one size of conduit. Exception: A concentric type breakout for a 1 -1 /4 inch trade size conduit and for one smaller trade size conduit may be provided in a cast metal enclosure. Revised 4.2 effective October 1 1 , 2006 4.2.1 Breakouts and knockouts shall be located so as not to result in interference with terminals or mounting screw holes or to cause reduction in minimum spacings when conduit fittings are in place. 4.2 revised and separated into 4.2, 4.2.1 , 4.2.2, and 4.2.3 effective October 1 1 , 2006 4.2.2 In a single-meter sheet metal enclosure, a single non-concentric knockout may be located above the line of the lowest live part, provided the knockout, after formation is pushed back essentially flush with the wall. 4.2 revised and separated into 4.2, 4.2.1 , 4.2.2, and 4.2.3 effective October 1 1 , 2006 4.2.3 In a single-meter enclosure a single concentric knockout may be located above the line of the lowest live part provided that such a knockout after formation is pushed back essentially flush with the wall. The concentric knockout shall also be subjected to the Concentric Knockout Rain Test, Section 1 6A. 4.2 revised and separated into 4.2, 4.2.1 , 4.2.2, and 4.2.3 effective October 1 1 , 2006
4.3 An external operating mechanism, such as for a disconnect, mounted on or through the enclosure shall withstand the environmental tests specified in the Standard for Enclosures for Electrical Equipment, UL 50, for the enclosure type marked in accordance with 25.4.1 . 4.4 Deleted February 1 5, 2006 4.5 An enclosure not exceeding 1 85 square inches (1 1 94 cm 2 ) frontal area may be formed of 0.060 inch (1 .52 mm) thick aluminum, if the aluminum hardness is grade H1 4, and if a meter socket is provided, the distance from the edge of the meter opening does not exceed 5 inches (1 27 mm) to an unflanged edge nor 1 0 inches (254 mm) to a flanged edge. 4.6 The cover over a socket for an individual meter shall be secured to the assembly by at least two fastenings. A latch or overlapping flange shall be considered as a fastening. 4.7 If required for a specific need, such as to provide for latching, the overlap between the cover and box may be less than 1 /2 inch (1 2.7 mm) but not less than 1 /4 inch (6.4 mm). The length of the reduced overlap shall not exceed 1 -1 /2 inches (38.1 mm).
UL 414-2007 pdf download.