Electrical Switch Nameplate IMG_1471.jpg

This image shows a specification nameplate for electrical equipment manufactured by Park Detroit. The nameplate identifies a metal-enclosed interrupter switchgear unit, Model PM255-2-2-LF, designed for outdoor installation and rated for NEMA 3R enclosure type, Category B service.

The equipment specifications indicate a maximum design voltage of 17.0 kV with a 95 kV insulation level (BIL). The unit is rated for 600 amperes continuous current and 600 amperes interrupting current at 60 Hz frequency. The horizontal bus rating is 600 amperes, with a 36 kV withstand voltage. The fault close current (RMS asymmetrical) is 22.4 kA, momentary current is 22.4 kA, and the short-time current at 1 second duration is 14.0 kA. The switchgear uses SM-20 fuses and is suitable for use on circuits capable of delivering not more than 14,000 RMS symmetrical amperes. A "KEEP OUT" safety sign is prominently displayed above the nameplate.