MIL-T-17221B, MILITARY SPECIFICATION: TRANSFORMERS, POWER DISTRIBUTION, SINGLE PHASE, 400 HERTZ, INSULATION CLASS 220 DEG C, DRY (AIR-COOLED) (NAVAL SHIPBOARD USE) (01-JUN-1973)

MIL-T-17221B, MILITARY SPECIFICATION: TRANSFORMERS, POWER DISTRIBUTION, SINGLE PHASE, 400 HERTZ, INSULATION CLASS 220 DEG C, DRY (AIR-COOLED) (NAVAL SHIPBOARD USE) (01-JUN-1973)., This specification covers dry type, 400 hertz (Hz), single-phase, electric transformers of standard mounting dimensions, used for shipboard electrical distribution.