Electric vehicle workshop safety: controlling high-voltage work

Recognise the additional hazards before accepting the job

HSE says electric and hybrid vehicles can contain direct-current systems operating at up to 650 volts. Accidental contact above 110 volts dc can be fatal in dry conditions, while components may retain dangerous voltage after the vehicle is switched off. The batteries also store substantial energy and may release harmful chemicals, fire or explosion if damaged or handled incorrectly.

Add the less obvious risks to the assessment: an electrically driven vehicle may move quietly, motors can move unexpectedly, remote keys can energise systems, damaged cabling may expose live parts and a heavy battery creates handling risks. Electrical systems may also affect medical devices such as pacemakers. These hazards sit alongside the workshop's existing lifting, movement, fire and mechanical risks.

Record which activities your business actually undertakes: sales and valeting, routine servicing away from the high-voltage system, body repair, recovery, diagnostics or direct high-voltage work. The controls and competence needed differ significantly. A single EV awareness certificate does not automatically authorise every one of those tasks.

HSE: working with electric and hybrid vehicles ↗

Triage the vehicle before it enters normal workflow

Ask what happened to the vehicle, what warnings are displayed and whether it has been recovered, submerged, charged, worked on or involved in a fire. Carry out a competent visual check for impact near the battery, underbody damage, leaking fluid, unusual heat, damaged orange cabling, smoke, vapour, hissing, popping or a strong acrid smell. Do not place staff beneath a suspect battery simply to get a better look.

If conditions suggest an unstable or damaged high-voltage battery, stop routine handling, keep people away and use the manufacturer's emergency response information. Government recovery guidance says flame, gas release, irritating chemical smell or abnormal sounds should trigger withdrawal to safety and fire-service assistance. The absence of those signs does not prove there is no thermal risk.

Create a quarantine and escalation route before the first damaged vehicle arrives. It should identify who makes the initial decision, where the vehicle can be secured, how its condition will be monitored, when emergency services or a specialist are needed and how neighbouring vehicles, buildings and escape routes will be protected. Do not copy a distance from recovery guidance without assessing the workshop, vehicle condition and consequences.

GOV.UK: recovery operators working with electric vehicles ↗

Match competence to the task, not the job title

HSE groups the work into lower-risk activities, incident response and recovery, maintenance that excludes the high-voltage system, and work on the high-voltage system itself. A valeter may need awareness of silent movement, remote keys and pressure-washing restrictions. A technician exposing or testing high-voltage components needs substantially greater technical knowledge, experience, equipment and supervision.

Define what each role may do, what it must not do and when the job transfers to a higher level of competence. Include reception, recovery drivers, valeters, apprentices, body technicians, painters and contractors as well as diagnostic staff. Make the boundary visible in the booking process and job card so an apparently routine task cannot drift into high-voltage work without review.

The Electricity at Work Regulations require people whose technical knowledge or experience is needed to prevent danger to possess it or be appropriately supervised. Check competence through the person's training, experience, understanding of the specific system and ability to apply the safe procedure—not course attendance alone.

Electricity at Work Regulations 1989: competence ↗

Control the key, movement and work area

Keep remote-operation keys far enough from the vehicle to prevent accidental activation, and lock them under the control of the person responsible for the work. If the procedure requires the key later, check that the vehicle and surrounding area are safe before it is retrieved. Control the standard 12 or 24 volt system in accordance with the vehicle-specific instructions as well.

Prevent unexpected movement before lifting or working around the vehicle. Confirm the drive state, parking arrangements and lift points from reliable information. Tell anyone moving vehicles that electric drive may be almost silent, and separate pedestrian routes from manoeuvring areas just as you would for other workshop traffic.

For high-voltage work, establish a secured area that prevents unauthorised approach. Use clear warning signs, control tools and removed components, and keep adequate working space, access and lighting. The boundary must work during breaks and shift changes, not only while the technician is standing beside the vehicle.

Electricity at Work Regulations 1989: working space and access ↗

Isolate, secure and prove dead to the specific procedure

Use the current manufacturer procedure for the exact model, system and task. Identify every relevant energy source, follow the specified shutdown sequence, allow the stated discharge time and secure the isolation so it cannot be reversed inadvertently. A service disconnect on its own is not proof that the conductors at the work point are dead.

HSE says high-voltage systems should be isolated, locked off and proved dead before work. Use suitable, maintained test equipment and prove the tester before and after the check using an appropriate proving method. Confirm where the test must be made; do not assume cable colour, a dashboard message or the absence of noise demonstrates electrical safety.

Even after isolation, the traction battery and other components can retain energy. Follow the manufacturer's instructions for stored-energy discharge and for any part that remains energised. Secure disconnected ends and components as required, and record who applied the isolation, the test result and the conditions for returning the vehicle to service.

Electricity at Work Regulations 1989: isolation ↗ · Related guide: safe isolation of work equipment →

Treat live work as an exceptional decision

The Electricity at Work Regulations do not permit live work simply because it is quicker or useful for diagnosis. Where danger may arise, work on or near a live conductor is allowed only when it is unreasonable for the conductor to be dead, it is reasonable to work live and suitable precautions are taken.

Require a task-specific decision by a person with the authority and competence to make it. Define the method, test equipment, insulated tools, barriers, supervision, emergency response and any personal protective equipment specified by the manufacturer. PPE is a final layer, not a substitute for avoiding live work or controlling the area.

If the workshop cannot establish all three legal conditions and a safe method, do not proceed live. Refer the vehicle to a suitably equipped specialist. Commercial pressure, a waiting customer or a diagnostic routine does not change the test.

Electricity at Work Regulations 1989: work on or near live conductors ↗

Check surrounding repair work and charging arrangements

Locate high-voltage cables and components before cutting, drilling, welding, panel work or underbody repair. Confirm that lifting pads and supports cannot damage the battery enclosure. HSE also warns that paint-booth temperatures may exceed a battery's permitted limit; follow the vehicle information and use the specified removal, insulation or temperature-control method.

Manage charging as a defined workshop activity. Use a suitable installed charge point and cable, protect it from impact and trip damage, follow the vehicle and charger instructions and remove damaged equipment from use. A tripping protective device signals a fault that needs investigation; it must not be bypassed merely to finish a job.

Review how charging, quarantined vehicles and high-voltage work affect fire detection, escape, emergency isolation, access for the fire and rescue service and the location of other combustibles. Introducing these activities may be a significant change. Review and, where needed, update the workplace risk assessment and statutory fire risk assessment before relying on existing arrangements.

HSE: health and safety in motor vehicle repair HSG261 ↗ · Fire Safety Order 2005: review after significant change ↗

Prepare for faults, damage and changing conditions

Write an emergency plan that covers electric shock, unexpected movement, battery damage, chemical release, smoke, vapour and fire. Staff need a simple instruction to stop, raise the alarm, isolate the area and call for specialist or emergency help. They should not improvise close inspection of a battery that is heating, venting or making abnormal sounds.

Give the fire and rescue service accurate information about the vehicle, battery condition, work completed, isolation state and location. Keep access routes usable and consider how smoke or vapour could affect occupied areas. Coordinate the plan with landlords, neighbouring employers and recovery contractors where responsibilities overlap.

Reassess whenever the condition changes. A vehicle that was acceptable at reception may show a new fault during charging, lifting or dismantling. Stop the job, move people to safety and escalate rather than treating the original job-card decision as permanent.

HSE: workplace emergency procedures ↗

Electric and hybrid vehicle workshop checklist

Official HSE, GOV.UK and legislation.gov.uk sources were checked on 13 November 2026. Vehicle systems and isolation methods differ substantially. Always use current manufacturer information for the exact model and task, and obtain competent specialist support where condition, isolation or safe handling is uncertain.

• List every EV and hybrid activity carried out by the business.
• Define competence and authorisation for each category of work.
• Obtain model-specific repair and emergency information.
• Triage damage before the vehicle enters normal workflow.
• Control remote keys, vehicle movement and the work area.
• Isolate, lock off and prove dead before high-voltage work.
• Use suitable insulated tools and maintained test equipment.
• Control cutting, lifting, paint-booth heat and charging interfaces.
• Plan quarantine, emergency escalation and condition monitoring.
• Review the risk assessments and fire arrangements after change.