Because of the centre-tapped system, each live conductor is only 55V relative to earth. This means that if a worker accidentally comes into contact with a single live wire, the shock risk is significantly lower than at 240V.
Site Regulations:
Many UK construction sites insist on using 110V equipment (including lighting, power tools, and extension leads) to comply with health and safety regulations and minimise injury risks.
HSE Guidance:
The Health and Safety Executive (HSE) often recommends that tools and other electrical equipment on construction sites operate at reduced voltage wherever possible.
240V Safety Considerations
Domestic and Commercial Installations:
Within a building’s permanent electrical installation, 240V lighting (officially 230V) is standard. Provided the system is installed and maintained according to wiring regulations (e.g., BS 7671), it is safe for everyday use.
RCD Protection:
UK regulations require Residual Current Devices (RCDs) or circuit breakers on circuits, which helps mitigate electric shock risk when using 240V systems.
Professional Installation:
Ensuring that 240V lighting products are properly installed by qualified electricians significantly reduces any risk, but the higher voltage does mean extra caution is required on active worksites.