The selection and suitability of equipment

Many factors which affect the selection of suitable electrical equipment, such as flammable, explosive and 

1 The planning and installation of a progressively extending electrical system on site 

A detailed account of this topic is given in the HSE publication Electrical Safety on Construction Sites (HSG 141) and only a summary will be given here. 

The site distribution system is the cabiing system and eiectricai equipment instaiied to suppiy eiectricity to various points across the site during the construction phase. The supervision, maintenance and deveiopment of the system must be the responsibiiity of a quaiified and competent eiectrician. Any extensions to the system must be agreed beforehand with the eiectrician. 

All fixed distribution cables carrying 400V or 230V must be protected with a metal sheath and/or armour which is continuous, effectively earthed and protected against corrosion. The HSE strongly recommend that any existing or new permanent fixed supply should not be used to supply contractors equipment during the construction work. Any movable plant such as lifts or hoists should be supplied by armoured cable. 

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