NFPA 111-2019 Standard on Stored Electrical Energy Emergency and Standby Power Systems.
6.2 Transfer Switches.
6.2.1 General. Transfer switches shall be rated for transferring the connected loads between the energy converter and the building electrical service.
188.8.131.52 Transfer switches shall be permitted to be electrical
electronic or a hybrid of both.
184.108.40.206 Any transfer switch shall be rated for transferring all connected electrical loads from one power source to another.
220.127.116.11 Transfer switch characteristics shall be sized for the
connected electrical load.
18.104.22.168 Transfer switches shall provide rated isolation between
the electrical load and the alternate source(s).
62t5 Transfer switches shall be permitted to be separate
devices within their own enclosures or an integral part of the
22.214.171.124 The capacity and endurance rating of transfer switches
shall be sized for all classes of loads to be served.
126.96.36.199 The method of operation of transfer switches shall ensure that the most likely causes of switch failure result in the
loads being connected to the building service,
188.8.131.52 Means shall be provided to check the operation of the transfer switch.
6.2.2 Switch Capacity.
184.108.40.206 The capacity of the transfer switch, electronic or electromechanical, shall be rated for all classes of loads to be
220.127.116.11 The transfer switch, including all load current—carrying components. shall be rated to withstand the effects of available fault currents.
6.2.3 Transfer Switch Classification.NFPA 111 pdf download.