Safe isolation
The procedure that proves a circuit dead before anyone works on it. Prove the indicator against a known source, isolate the circuit, secure the isolation with your own lock and tag, prove the point of work dead across all conductor combinations, then prove the indicator again. The final step is the one that catches a tester that died mid-job.
Where Safe isolation fits in the learning path
The Sparks Basics section covers these units:
- Working Safely
Curriculum mapping: C&G 2365 Unit 201.
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The HSE's guidance note on electrical test equipment used by electricians. It describes what safe voltage indicators, probes and leads look like: fused or current-limited leads, finger barriers, minimal exposed probe metal, and a proving unit to verify the indicator before and after use. 'GS38-compliant' is shorthand for test kit you can trust your life to.
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GS38
The HSE's guidance note on electrical test equipment used by electricians. It describes what safe voltage indicators, probes and leads look like: fused or current-limited leads, finger barriers, minimal exposed probe metal, and a proving unit to verify the indicator before and after use. 'GS38-compliant' is shorthand for test kit you can trust your life to.
Read the GS38 entryPolarity
Verification that conductors are connected the right way round throughout an installation. Single-pole switches and protective devices must sit in the line conductor, the centre contact of screw lampholders on line, and socket terminals wired as marked. A polarity fault can leave equipment live when switched off — which is why it is checked dead and confirmed again live.
Read the Polarity entryBasic protection
Protection against touching live parts during normal, fault-free service. It is delivered by insulation around conductors, barriers and enclosures around terminals, and placing live parts out of reach. It is the first layer of shock protection; fault protection is the second, and an installation needs both.
Read the Basic protection entryA definition is a start. Using it in a real question is where it sticks.