1. The switchbox cuts current to the electrosurgical instrument and signals an alarm.

2. Coils, electric, holders for electric coils, branch boxes (electricity), junction boxes (electricity), switchboxes (electricity), couplings, electric, wires of metal alloys (fuses)

3. Adjust the field rheostat in the switchbox to the pipe nipple, i. e. the highest voltage which an arrow points to.

4. Adjust the field rheostat in the switchbox to the pipe nipple[Sentencedict.com], i. e. the highest voltage which an arrow points to.