Procedures for safely isolating supplies

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Presentation transcript:

Procedures for safely isolating supplies Unit 202: Electrical principles and processes for building services engineering Outcome 3 Procedures for safely isolating supplies

Safe isolation This is important to undertake before any kind of work starts on electrical appliances. Pumps Showers Programmers

Safe isolation Thermostats Immersion heaters Plugs/spurs

Safe isolation Boilers Cookers Valves

Safe isolation Multimetre, test leads and probes Approved voltage tester with proving unit Non contact voltage indicator Locked off and labelled GS38 The HSE testing equipment standard (Test probes max 4mm, preferably 2mm)

Safe isolation Test the voltage indicator on a known source (proving unit or adaptor plug). Prove the appliance is live: place probes onto the live and neutral on the appliance mains connection – voltage indicator lights up. Identify the source for the supply ie MCB or fuse. Switch off MCB, lock and label, or remove fuse, lock and label. Go back to appliance and prove appliance is dead: place probes onto the live and neutral on the appliance mains connection – voltage indicator does not light up. Re-test the voltage indicator on a known source for a second time (proving unit or adaptor plug).

Safe isolation The correct locations to carry out safe isolation are: Consumer unit Fused spur Switch fused spur Always lock and label to avoid the supply being switch back on by mistake (retain fuse).