ELECTRICAL SAFETY DESIGN

Reversed Polarity with Circuit Ground

In reversed polarity the black (ungrounded) and white (circuit grounded) conductors are reversed. Although a shock hazard may not exist in this situation, other mechanical hazards can occur. For example, if an internal fault occurs in the wiring, the equipment would not stop when the switch is released or would start as soon as the supply cord is plugged into the improperly wired outlet. This could result in serious injury.