Which voltage is normally used for portable hand tools on construction sites?
Answer and explanation
Correct answer: B. 110 volts, from a centre-tapped transformer
- Step 1: A 110 V supply with the centre tapped to earth limits the voltage to earth to 55 V. Step 2. That reduces the severity of shocks. Answer: 110 volts, from a centre-tapped transformer. Why not the others: Mains voltage, three-phase and 12 V are not the standard for site hand tools.
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