CSCS Health & Safety Test· CSCS / CITB
For portable electric tools on a UK construction site, the preferred safer supply is:
Choices
- A230 V mains
- B110 V reduced low voltage (yellow plug and transformer)Correct
- C415 V three phase
- DAny voltage available
Answer
110 V reduced low voltage (yellow plug and transformer)
110 V reduced low voltage, supplied through a centre-tapped transformer with yellow connectors, limits the shock voltage to around 55 V to earth, making it much safer than 230 V for site tools. Battery tools are safer still.
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