• • • SAFETY IN ENGINEERING • • •
other types of metalwork which should be earthed. This invisible danger can be present in any workplace situation ranging from simple domestic wiring through to commercial and industrial installations.
There are many types of faults which can cause live metalwork including incorrect or hazardous wiring, trapped cables and Protective Earth Neutral (PEN) faults. Widely discussed in the industry, the PEN fault is where a break or ‘open circuit’ occurs in a PEN conductor, which serves as both the neutral and protective earth. A broken or faulty PEN conductor can cause dangerous voltages to appear on metalwork, creating an electric shock risk, as well as the potential for fires and equipment damage.
Additional safety checks For potentially live metallic items, performing a touch test is
essential.Single pole contact indicators such as the Martindale VT7, can be incorporated into touch test safety procedures to help identify potential issues. Measurement of current flowing through the earth using a suitable current clamp such as the Martindale CM79 can help identify potential diverted currents flowing through unintended paths. In both cases any tester being used should be checked to be functional before use, and correct use should be included in relevant safety training. Standard, industry wide, safe isolation procedures do not cover checking for live metal
parts, however incorporating this into established work processes will minimise risk and help ensure safer working practices
Safety first
Safe isolation is neither complex nor costly but is vital for compliance with the Electricity at Work Regulations and for preventing harm. Locking off devices, using compliant voltage indicators and
proving dead with proving units are central to the process. Being aware of the risks associated with live metalwork is also key.
By embedding these procedures, workplaces can significantly reduce the risk of electrical accidents. Safety must always remain the priority, and safe isolation provides the foundation for protecting both people and infrastructure.
https://martindale-electric.co.uk
electricalengineeringmagazine.co.uk
ELECTRICAL ENGINEERING • DECEMBER/JANUARY 2026 21
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