This specification covers a direct current (dc) power supply operating from an input voltage of either a 115/208 volt (V) 3-phase 4-wire, 48 to 65/380 to 420 hertz (Hz) alternating current (ac) or a 115/208-V single-phase 2 wire 48 to 65/380 to 420 Hz ac and providing two output voltages. The output voltages shall be 10 to 18 direct-current volts (Vdc) at 5 amperes (A) and 21 to 31 Vdc at 60 A output. Intended Use: This power supply is intended for field use to supply direct current communications equipment normally powered by vehicles or dc power supplies.