scope:

The standards in this part apply to static automatic and static non-automatic transfer equipment without cross-connection of sources during transfer or retransfer, with or without bypass isolation switches rated 600 volts AC or less, not exceeding 6000 amps, for use on single-phase and polyphase AC circuits.

Static transfer equipment that does have cross-connection of sources during transfer or retransfer is outside the scope of this standard.

General

The definitions and standards of ICS 1, except for clause 7 pertaining to spacings as indicated, also apply to this standard.

These requirements cover solid state automatic transfer equipment intended for use in ordinary locations to provide for lighting and power only in optional stand-by systems in accordance with Article 702 of the National Electrical Code, ANSI/NFPA 70.