How long can the heating wire be inserted without temperature?

An hour. Without the temperature, the heating wire can't be energized for a long time, and it can be plugged in for one hour at the longest. Excessive use will increase the temperature of the tropical zone, which may cause fire and other hidden dangers. The main uses of heating wires are metallurgical machinery, medical treatment, chemical industry, ceramics, electronics, electrical appliances, glass and other industrial heating equipment and civil heating appliances.