UK trade-and-hazard guidance by the Riskora Editorial Team
Live working is the exception, never the default. The HSE's HSR25 (Memorandum of Guidance on the Electricity at Work Regulations 1989) is unambiguous: dead working is the legal expectation, and any RAMS that contemplates live work must demonstrate why isolation was not reasonably practicable. The lock-off, prove-dead, prove-tester process is the minimum control set, and a RAMS that omits the GS38 test-lead specification or the secondary proving step will fail competent review every time.
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Electricity at Work Regulations 1989
Regulation 14
No person shall be engaged in any work activity on or so near any live conductor that danger may arise unless: (a) it is unreasonable in all the circumstances for it to be dead; AND (b) it is reasonable in all the circumstances for him to be at work on or near it while it is live; AND (c) suitable precautions have been taken.
HSR25 Memorandum of Guidance on EAW
Paragraphs 175-191
Detailed guidance on isolation, lock-off, proving dead, and the conditions under which live work may exceptionally be undertaken.
HSE GS38 (4th edition)
All
Specifies test probes and leads to be used during electrical testing — fused, finger-guarded, with maximum 4mm exposed tip.
Every UK RAMS reviewer applies the hierarchy of controls in the order below. Defaulting straight to PPE is the single most common reason a RAMS fails review.
1. Eliminate
Isolate at the local DB and lock off using a personal padlock with single-key custody. Where possible, isolate further upstream to remove the busbar from the work area.
2. Substitute
Plan works during shutdown windows so isolation is the planned method rather than an exception — particularly on commercial sites with 24/7 occupancy.
3. Engineering controls
Multi-padlock hasps (every operative locks on), GS38-compliant test equipment, voltage-indicating proving units, insulated mats below the work position for any live testing.
4. Administrative controls
Permit-to-work issued by Authorising Engineer. Lock-off log signed at start and end of every isolation. Live work justification form (HSR14) completed for any exception.
5. PPE (last line)
Class 0 insulated gloves where any live exposure is possible. Arc-rated coveralls (ATPV cal/cm² rated to the prospective fault energy). Insulated tools to BS EN 60900.
RAMS that allow live working without a written HSR14 justification. 'For continuity of supply' is not an acceptable reason on its own — the test is whether dead working is reasonable, not whether it would be inconvenient.
An illustrative extract structured for principal-contractor review. Site-specific facts must be substituted and checked by a competent person.
All works will be carried out dead. The local distribution board (DB-3-04) will be isolated at incomer Q1, padlocked using a personal padlock with the key retained by the working electrician throughout. Multi-padlock hasps will be applied where more than one operative is working. Circuit will be proved dead using a GS38-compliant two-pole tester (Megger MTB7671) verified against a known live source before and after testing per the prove-tester / prove-dead / prove-tester sequence. No live working is anticipated; if any unavoidable live exposure arises, work will stop and a HSR14 justification will be raised to the Authorising Engineer before proceeding.
Daily test instrument calibration check (GS38 lead inspection). Lock-off log inspected by site supervisor. Toolbox talk on safe isolation prior to any new circuit.
Can electricians ever work live?
Only when all three EAW Reg 14 conditions are met: dead working is unreasonable, live working is reasonable, and suitable precautions are in place. In practice this applies to fault diagnosis on critical systems and very limited testing — never installation work on routine projects.
What is the prove-dead, prove-tester sequence?
Prove the test instrument against a known live source, then test the circuit to confirm it is dead, then re-test the instrument against the live source to confirm the instrument did not fail between readings. This three-step sequence is the GS38/HSR25 baseline and any RAMS that skips it will fail review.
Do electricians need separate lock-off RAMS for each isolation?
The RAMS should cover the isolation methodology, but each isolation event must be logged on a permit-to-work or lock-off register. The RAMS sets the rules; the permit records the specific instance.
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