Question 171Electricity & Electronics - QMED
70% to passWhich of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component?
AGround the case of the machine before beginning any repairs.
BOpen the supply circuits and tag the switches.
CUse only approved non-conducting tools.
DWear rubber gloves and boots.
AI Explanation
The correct answer is B) Open the supply circuits and tag the switches. This is the correct answer because it represents the first and most important precaution to take before working on any installed electrical component. Electricity can be extremely hazardous, and the primary step is to isolate the power supply and ensure it cannot be accidentally reenergized while work is being performed. Tagging the switches helps prevent others from turning the power back on. The other options, while also important safety measures, should only be taken after the power has been disconnected.
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