1 Scope

1.1 These requirements apply to automatic interconnection switches (interconnection switches) for use with power generation equipment (including microgrids) to provide for automatic connection to and isolation from the main power source (utility), where the power generation equipment also serves as a source for an emergency or legally required system.

1.2 These requirements apply to automatic type interconnection switches rated up to 1000 volts ac and 1500 volts dc for use in non-hazardous locations, in accordance with the National Electrical Code (NEC), NFPA 70, Articles 700 and 701.

NOTE: See Sections 700.12 (G) and 701.12(H) of NFPA 70, the National Electrical Code - 2023, the NEC.

1.3 These requirements apply only to the switching devices and their integral control circuits and do not address additional system level controls needed for the integration into power generation equipment. These devices are not intended to provide compliance with electric utility grid interconnection standards and codes.

1.4 These requirements apply to completely enclosed interconnection switches and to open type interconnection switches intended for mounting in other equipment such as switchboards or switchgear. The integration of these interconnection switches in other equipment is subject to the requirements of the standard covering the final equipment.

1.5 Interconnection switches are not intended for service equipment use or for connection to the line side of a service disconnect.

1.6 These interconnection switches may or may not be used in conjunction with transfer equipment as part of emergency or legally required standby systems.

1.7 These Interconnection switches are acceptable for total system transfer, which includes control of motors, electric-discharge lamps, electric-heating loads, and tungsten-filament lamp loads where the total tungsten-filament lamp load does not exceed 30% of the current rating.

1.8 These requirements do not apply to:

1. a) Manual or non-automatic interconnection switches; and

2. b) Solid-state (static) switches.

1.9 These requirements do not address controls for the proper operation for the sources within a microgrid.