2.3 Live Working Precautions, Risk Assessment & PPE

2.3 Live Working Precautions, Risk Assessment & PPE

The Statutory Prohibition: Regulation 14 of the Electricity at Work Regulations 1989 (EAWR) establishes an absolute prohibition: No person shall be engaged in any work activity on or so near any live conductor (other than one suitably covered with insulating material so as to prevent danger) that danger may arise, unless three strict conditions are fulfilled simultaneously.

The statutory framework of the EAWR establishes working dead as the primary legal baseline. Regulations 12 (secure isolation) and 13 (precautions for equipment made dead) mandate that circuits must be safely isolated before work commences. Live work is permitted only where all three Regulation 14 conditions are met. Commercial convenience or timetable pressure alone is insufficient. Assess the actual necessity, alternatives, risks and precautions rather than treating either customer preference or the word diagnostic as authorisation.

Furthermore, Regulation 16 dictates that no person shall engage in any work activity where technical knowledge or experience is required to prevent danger or injury unless they possess such competence or are under appropriate supervision. Live diagnostic work demands the highest standard of technical competence.

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The Three Statutory Tests of Regulation 14

To perform any work activity on or near uninsulated live conductors, the duty holder must be capable of defending three distinct criteria in a court of law. All three conditions must be satisfied concurrently:

                    ┌──────────────────────────────────────────────┐
                    │  Regulation 14 Three-Part Statutory Test    │
                    └──────────────────────┬───────────────────────┘
                                           │
         ┌─────────────────────────────────┼─────────────────────────────────┐
         ▼                                 ▼                                 ▼
┌─────────────────┐               ┌─────────────────┐               ┌─────────────────┐
│  Condition (a)  │               │  Condition (b)  │               │  Condition (c)  │
│ Unreasonable for│               │ Reasonable for  │               │    Suitable     │
│ it to be dead?  │               │ work to be done │               │   precautions   │
│                 │               │     live?       │               │ taken? (RAMS/PPE│
└────────┬────────┘               └────────┬────────┘               └────────┬────────┘
         │                                 │                                 │
         └─────────────────────────┬───────┴─────────────────────────────────┘
                                   ▼
                   Must ALL be TRUE simultaneously
                   (If ANY condition is FALSE -> Work is ILLEGAL)

1. Condition 1: It is unreasonable in all the circumstances for the conductor to be dead.

   • Establish why the particular work needs live conductors. Some necessary measurements, such as supply voltage or RCD operating time, require energisation; other verification can use dead testing, calculation, inspection or enquiry.
   • A loop-impedance or prospective-current value does not automatically require a direct live measurement. Likewise, checking phase-sequence connections is distinct from a live phase-rotation test.
   • The law requires assessment of all relevant circumstances, not a diagnostic-only exemption. Do not extend justification for a necessary live test to subsequent repair work; arrange maintenance and repair dead.

2. Condition 2: It is reasonable in all circumstances for the person to be at work on or near it while it is live.

   • Even if the test requires power, is it justifiable for an operative to work directly on or near exposed conductors at this moment? The operative must possess verified competence under Regulation 16, appropriate tooling, adequate space, clear sightlines, and an environment free from slip or trip hazards.

3. Condition 3: Suitable precautions (including where necessary the provision of suitable protective equipment) are taken to prevent injury.

   • Suitable precautions involve a documented Safe System of Work, temporary insulating shrouding, barriers, certified test probes complying with HSE Guidance Note GS38, PPE, and an accompanying safety attendant.

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Risk Assessment, Method Statements (RAMS) & Permits to Work

Before undertaking any inspection and testing involving live terminals, a comprehensive Risk Assessment and Method Statement (RAMS) must be compiled:

The Hierarchy of Risk Control

• Elimination: Isolate the installation and perform dead testing ($R_1+R_2$, insulation resistance, polarity) whenever possible per Regulations 12 and 13.
• Engineering Controls: Erect temporary insulating shrouds, polycarbonate screens, electrical insulating matting, and physical barriers around the open switchboard. Use GS38-compliant test probes with $\le 4\text{ mm}$ (preferably $\le 2\text{ mm}$) exposed tips and finger guards.
• Administrative Controls: Plan and record the safe system of work, control access, display warning notices and provide competent accompaniment where needed. Do not issue an electrical permit-to-work as authority for live testing.
• PPE: Deploy personal protective equipment as the final layer of defence against residual electric shock and arc-flash risks.

Role of the Safety Attendant (Accompanier)

For high-energy or complex live testing, an accompanying person must be appointed. The attendant must:

• Be technically competent under EAWR Regulation 16 to recognize electrical danger.
• Know the exact location of the supply isolator and how to isolate power immediately in an emergency.
• Be trained in emergency electric shock rescue, resuscitation (CPR), and AED operation.
• Have no other competing duties that distract from observing the operative.

Electrical Permit-to-Work for Dead Work

An electrical permit-to-work is primarily a precise record that identified equipment has been isolated, proved dead and, where appropriate, earthed. It must not be issued for equipment still live or used to authorise live work. General site permit systems serve a broader management purpose and do not replace EAWR Regulation 14.

Where an electrical permit is appropriate:

1. Issue: The designated competent person identifies the equipment, work, isolation points, precautions and adjacent live hazards after making the equipment safe.
2. Acceptance: The person responsible for the work checks and accepts the scope and precautions; a group leader explains them to the team.
3. Changes or interruption: Follow the site's controlled procedure; changed work requires cancellation and a new permit rather than an informal extension of scope.
4. Clearance and cancellation: Confirm people, tools and temporary equipment are clear and hand back control. The authorised restoration procedure follows; clearing a permit does not by itself make re-energisation safe.

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Personal Protective Equipment (PPE) & Insulating Barriers

Select PPE for the assessed voltage and arc hazard after considering how to eliminate or reduce exposure. General impact or heat/flame ratings alone do not establish electric-arc protection. Relevant product standards include:

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Emergency Procedures: Electric Shock Response & First Aid

If an operative suffers an electric shock and remains in contact with live conductors, rapid, disciplined action is vital to save life without creating a second casualty:

Immediate Emergency Action Sequence

1. Make the Scene Safe: Isolate the electrical supply using a suitable isolator, circuit-breaker or safe disconnection of the plug. An emergency stop may only stop a machine and must not be assumed to remove dangerous voltage. Do not touch a casualty still in contact with the supply.
2. Safely Release the Casualty: If the supply cannot be severed immediately, use a non-conductive rescue hook, dry wooden broom handle, dry timber batten, or thick dry woollen coat to pull or push the casualty clear of the conductor.
3. Raise the Alarm: Shout for help and dial 999 (or 112) immediately. Request an ambulance, explicitly stating "severe electrical shock / unconscious casualty".
4. Assess and Initiate Resuscitation:
   • Once safe to approach, check responsiveness. If unresponsive, call 999 without delay and assess breathing while the call connects.
   • If unresponsive and not breathing normally, start CPR: 100–120 chest compressions per minute. If trained to give breaths, use 30 compressions to 2 breaths; otherwise give continuous compressions and follow the call handler.
   • Deploy an Automated External Defibrillator (AED) immediately if available; electric shock frequently induces ventricular fibrillation (VF).
5. Treat Secondary Injuries: After immediate life-saving actions, cool burns with cool running water for 20 minutes and cover appropriately. Electrical burns require emergency medical assessment, even if small externally. Monitor for other injuries, including those from falls, and follow emergency-service advice.