Hybrid and EV Shop Safety

How often do high-voltage safety gloves need to be tested?

Inspect and air-test rubber insulating gloves before every use, and have them electrically retested by an approved lab on the schedule required by the standards your shop follows, commonly every six months once issued.

What is lockout/tagout for hybrid and EV service?

Short answer: Lockout/tagout means disabling the high-voltage system per the maker's procedure, securing the service disconnect or key so no one can re-energize it, tagging the vehicle, and verifying zero voltage before work.

Many EVs and hybrids have a service disconnect, plug or fuse that isolates the high-voltage battery. Removing it, along with turning off the vehicle and disconnecting the 12 volt battery, prevents the system from energizing.

Lockout means keeping the disconnect and key under the control of the technician doing the work, often in a lockbox or pocket, so no one else can restore power. Tagout means labeling the vehicle so others know high-voltage work is in progress.

After disabling, wait the time specified for capacitors to discharge, then verify zero voltage with a properly rated meter at the points listed in service information. Test the meter on a known source before and after. Only trained technicians should perform these steps.

How should a shop mark off a vehicle during high-voltage work?

Short answer: Use barriers, cones and signs to create a clear boundary around the vehicle, and keep untrained staff and customers out of the area while the high-voltage system is open.

When the high-voltage system is being disabled, opened or worked on, other people in the shop need to know to stay away. A clearly marked boundary prevents an untrained coworker from touching components, reconnecting a service plug or bumping into the work.

Common practice includes barriers, cones or caution tape around the vehicle, signs stating that high-voltage work is in progress, and a magnetic topper or hood sign. Some shops use a dedicated EV bay with rubber mats and non-conductive work surfaces. Keep the area free of clutter, and keep insulated rescue equipment and a suitable fire extinguisher nearby as your safety program requires.

Train every employee on what the barriers mean, including service writers and porters, and keep customers out. Remove barriers only after the system is restored, verified and the technician confirms it is safe. Record high-voltage work in the repair order.

How should a shop store a damaged electric vehicle?

Store a damaged EV outdoors, away from buildings and other vehicles where possible, follow the maker's emergency response guide, and watch for signs of battery heating such as smoke, popping or unusual smells.

Are insulated hand tools needed for EV work?

Short answer: Yes, insulated tools rated for the voltage are recommended or required by many maker procedures when working near high-voltage components, but they supplement, not replace, de-energizing the system.

Insulated hand tools have a coating rated for a specific voltage, commonly 1000 volts, and are tested to recognized standards. They reduce the risk of shock or an arc flash if a tool touches an energized component or bridges two conductors. Some makers also call for non-conductive tools for specific tasks.

Use insulated tools when the maker's procedure calls for them, typically while removing service disconnects, verifying zero voltage and working near high-voltage connections. Inspect the insulation before each use; a cut or chip can expose the metal underneath, so remove damaged tools from service. Store insulated tools separately so they are not used for heavy general work that damages the coating.

The primary safety step is still de-energizing the system and verifying zero voltage with a properly rated meter. Insulated tools and rated gloves are additional layers of protection, not substitutes for following the shutdown procedure.