1 Scope

1.1 These requirements cover meter sockets for use with:

1. a) Watthour and similar meters;

2. b) Test switches;

3. c) Metering transformer cabinets; and

4. d) Metering transformer cabinet interiors.

for installation in accordance with NFPA 70^®, National Electrical Code^® (NEC^®).

NFPA 70^®, National Electrical Code^®, and NEC^® are registered trademarks of the National Fire Protection Association, Quincy, MA.

1.2 Meter sockets are marked with a continuous duty ampere rating and may in addition have a maximum use (intermittent) ampere rating of 125 % 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 Except as indicated in 10, as covered by these requirements, a meter socket does not include:

1. a) A meter;

2. b) An overcurrent device;

3. c) An instrument transformer;

4. d) An arcing or switching part; or

5. 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:

1. a) 300 volts alternating current or less, or 600 volts alternating current; and

2. b) 400 amperes maximum per meter position.

Summary of Topics

This New Tenth Edition of ANSI/UL 414 dated September 9, 2025 incorporates editorial changes including renumbering and reformatting to align with current style, as well as the following changes in requirements:

– Short Circuit Closing Angle; B13.4.1, B13.8.3

– Correlation of Annex B and Annex C Requirements; B2.5, B2.7, B4.2, B5.5, B6.3, B6.6, B6.7, B7.1.5, C6.3

– Removable Housing Members; B5.1, B7.1.1, B7.1.7 – B7.1.10, C14.13

– Voltage Update to B7.2.5;

– Electronic Marking and Instructions; B15, B17, C15, C17

– Power Control System for Load Control; C5.12, C5.13, C9.3, C14.6, C14.7, C15.2

– Editorial Update: Removal of Appendix A;