Feasibility of Energization Indicators for Electrical Equipment

One of the contributing factors to electrical accidents is that the body's senses do not respond to commonly occurring electric fields, and therefore provide no warning that contact with an energized conductor is imminent. This paper investigates the feasibility of incorporating visual indicating devices into cable insulation and electrical equipment to warn of energized conditions. Techniques considered include electroluminescent coatings, liquid crystals, and piezo-electric plastic materials, as well as arrays of LED indicators on breakers, cable couplers, and other critical points. Such devices should reduce accidents by aiding trouble-shooting of circuits, eliminating the possibility of working on "wrong" circuits and cables, and providing an constant reminder that a hazard is nearby.