The exothermic electrodes will sustain ignition without electrical power as long as oxygen is flowing; therefore, the diver may call for SWITCH OFF once the electrode is burning. Although the exothermic electrodes will continue to burn when the current is off, it is recommended that electrical current be used to provide more heat and enhance the cutting process on all conductive material.

Correct power settings will result in quick, efficient cutting. The ultrathermic electrode requires only 150 amps at the torch working depth, as opposed to 200-300 for the Sea-Jet. Excessive current settings for the ultrathermic will result in rapid consumption of the electrode. 

With proper oxygen and power settings, the exothermic electrodes will burn for 45 to 55 seconds. A tong test ammeter is extremely useful in determining the exact amperage being used at the workpiece. Do not rely solely on the values as indicated by panel control knobs or meters, as these are not always accurate. Simply encircle the negative (-) welding lead with the tongs of the amperage tong meter and close them. A clear, accurate reading is instantly registered on the scale. The tongs open by a slight pressure of one finger on the trigger and are self-closing.