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intermediate switch control main lighting in a corridor with many switches two-way switch control main lighting in a room having two entrances one-way switch control main lighting circuit in a room having only one entrance TN-S system electricity supply which uses the cable sheath to provide an earth TN-C-S system electricity supply in which the protective and neutral functions are combined PME system electricity supply in which the protective and neutral functions are combined TT system electricity supply in which the earthing arrangements must be provided by the consumer spring toggle fixing method suitable for holding a lightweight load on a plasterboard partitioning commercial steel trunking installation suitable for this type of installation industrial steel trunking installation suitable for this type of installation commercial steel conduit installation suitable for this type of installation industrial steel conduit installation suitable for this type of installation domestic PVC insulated and sheathed wiring systems suitable for this type of installation horticultural PVC conduit installation suitable for this type of installation CFL energy-efficient lamp fluorescent tubes energy-efficient lamp screw fixing to a plastic plug fixing method suitable for holding a medium weight load cable clip fixing method suitable for holding a PVC insulated and sheathed cable on to a wood surface such as a ceiling joist rawlbolt fixing method suitable for securing a heavy electric motor to a concrete bed 110 V electrical supplies on construction sites for portable tools 400 V electrical supplies on construction sites for major items such as cranes 230 V electrical supplies on construction sites for site offices RCD protection requirement for all final circuits, both power and lighting Electricity at Work Regulations statement no one may work 'live' Duty of Care everyone in the workplace has this responsibility for safety Duty Holder company representative responsible for electrical safety in the work environment intrinsically safe circuit in which no spark or thermal effect is capable of causing ignition of a given explosive atmosphere flashpoint lowest emperature at which sufficient vapour is given off from a flammable substance to form an explosive gas hazardous area any place in which an explosive gas-air mixture is present passive infra-red(PIR) detectors lighting units that switch on automatically whenever the area covered is approached by a moving body