760.121 Power Sources for PLFA Circuits
- A listed PLFA or Class 3 transformer
- A listed PLFA or Class 3 power supply
- Listed equipment marked to identify the PLFA power source
Informational Note: Examples of listed equipment are a fire alarm control panel with integral power source; a circuit card listed for use as a PLFA source, where used as part of a listed assembly; a current-limiting impedance, listed for the purpose or part of a listed product, used in conjunction with a nonpower-limited transformer or a stored energy source, for example, storage battery, to limit the output current.