Fuses
The main line fuses, which protect the entire system from overloads, when blown, should be replaced by other fuses of the same rating.
The fuse for the mouth and throat heater circuit is for the purpose of protecting this circuit from accidents, and should always be replaced by another fuse of the same rating. This replacing of the fuses by others of the same rating is very important. On a 200 to 250-volt circuit, the main line fuses should be 10 amperes. The mouth and throat fuse, which is located in the control box above the magnetic switch, should be 3 amperes. On a 100 to 125-volt circuit the main line fuses should be 20 amperes. The throat and mouth fuse should be 5 amperes. Fuses of a greater amperage than those mentioned may cause the units to burn out or cause a fire hazard.