# Job Hazard Analysis: Troubleshooting circuits URL: https://hardhatbinder.com/en/jha/electrical/troubleshooting-energized Last updated: 2026-10-23 Finding and fixing faults in branch circuits, feeders, panels, receptacles, switches, and fixtures up to 480V in occupied or under-construction buildings. Includes voltage testing, de-energizing and locking out, opening panels and boxes, and restoring power. Live work is limited to testing and measuring only. > A general example for this task. Your JHA should reflect your crew, equipment and site — review it with a competent person before work starts. ## Steps, hazards and controls ### 1. Plan the job: talk to the customer, review panel schedules and drawings, and decide what can be shut off. - **Wrong circuit identified because panel directory is missing or wrong, leading to contact with energized conductors.** (High): Treat every conductor as energized until you test it yourself.; Use a circuit tracer to confirm which breaker feeds the circuit before shutting off.; Plan to work de-energized. Only qualified electricians may test live, and no live repair work is allowed on this job. - **Shutting off power to critical loads (medical equipment, fire alarm, refrigeration, elevators) without warning.** (Medium): Coordinate the shutdown time with the customer and building manager before turning anything off.; Post notices on affected areas and equipment. ### 2. Set up the work area: barricade the panel or box, set up the ladder, and check your meter and tools. - **Damaged or wrong-rated multimeter or test leads failing during a voltage test and causing an arc blast.** (High): Use a CAT III or CAT IV meter rated for the voltage; replace cracked leads, probes, or a meter with a damaged case.; Use test leads with finger guards and shrouded tips.; Check the meter on a known live source before each use. - **Falls from a 6-ft fiberglass stepladder while reaching fixtures or ceiling boxes.** (Medium): Use fiberglass ladders only, never aluminum, near electrical work.; Open the stepladder fully with spreaders locked; do not stand on the top cap or top step.; Keep three points of contact and move the ladder instead of overreaching. - **Customers or other trades walking into an open panel or work area.** (Medium): Set up caution tape or cones around open panels and post a danger sign.; Never leave an open panel unattended. ### 3. Test the live circuit to find the fault: measure voltage, check breakers, and look for heat or damage. - **Electric shock from touching energized bus bars, lugs, or terminals inside a 120/240V or 277/480V panel.** (High): Test from outside the panel first (receptacles, fixture terminals) when possible.; Keep the panel dead-front on when testing at breaker terminals if access allows.; Use one hand where possible, keep the other hand away from grounded metal, and stand on a dry surface or rubber mat.; Wear voltage-rated rubber gloves with leather protectors when testing inside panels. - **Arc flash from a slipped probe shorting phase to phase or phase to ground.** (High): Check the arc flash label on the equipment and wear arc-rated clothing and face shield rated for that incident energy.; Use insulated probe tips with minimal exposed metal.; Stand to the side of the panel, not directly in front, when testing. - **Burns from overheated conductors, breakers, or failed connections.** (Medium): Check for heat with an infrared thermometer before touching components.; Report burned or melted parts to the foreman before going further. ### 4. De-energize and lock out the circuit, then verify zero voltage. - **Someone re-energizes the circuit while you are working on it.** (High): Put your own lock and tag on the breaker or disconnect using a breaker lockout device; each worker uses their own lock.; Tag shows your name, date, and 'Do Not Operate'.; Tell the customer and other trades that the circuit is locked out. - **Backfeed or a second source (multi-wire branch circuit, generator, solar, shared neutral) keeps the circuit live.** (High): Test before touching: live-dead-live test with your meter on every conductor, including neutral to ground.; Shut off and lock out all breakers on multi-wire branch circuits with shared neutrals.; Ask about generators, solar, or UPS units before starting. ### 5. Repair the fault: replace breakers, devices, splices, or damaged wire with the circuit locked out. - **Cuts from utility knives, wire strippers, and sharp box edges.** (Low): Use cable strippers instead of a utility knife when possible; cut away from your body.; Wear cut-resistant work gloves when stripping wire. - **Striking a hidden live conductor when drilling or cutting into walls to trace wiring.** (Medium): Scan the wall with a non-contact voltage tester and stud finder before cutting tablaroca.; Cut shallow openings with a drywall saw, not a reciprocating saw.; Use insulated hand tools rated 1000V. - **Dust and debris falling in your eyes when working overhead in ceilings.** (Low): Wear safety glasses at all times; add goggles when working above your head in dusty ceilings. ### 6. Restore power: remove tools, reinstall covers, remove locks, and test the circuit. - **Energizing with a worker still in contact, tools left in the panel, or a fault still present, causing shock or arc flash.** (High): Count your tools and check the panel and boxes are clear before closing.; Reinstall all covers and dead-fronts before energizing.; Only the person who placed a lock removes it; confirm everyone is clear out loud.; Stand to the side of the panel and look away when closing the breaker. ### 7. Clean up: pick up wire scraps and packaging, fold the ladder, and close up the work area. - **Slips and trips over wire scraps, cords, and tools on the floor.** (Low): Put scraps in a bucket as you work and coil extension cords when done.; Do a final walk of the area with the customer before leaving. ## Required PPE - Safety glasses — ANSI Z87.1 at all times on site. - Voltage-rated rubber gloves with leather protectors — Class matched to the voltage; air-test before each use. Required for testing inside panels. - Arc-rated shirt, pants, and face shield or hood — Rated at or above the incident energy on the equipment label, for any live testing in panels. - Hard hat — Class E electrical-rated when working on active construction sites or overhead hazards. - Work boots — Electrical hazard (EH) rated, closed toe. - Cut-resistant work gloves — For stripping wire and handling boxes when the circuit is locked out. ## Training - Qualified electrician training on electrical hazards, safe testing, and limits of approach before any live testing. - Lockout/tagout procedure training, including live-dead-live testing. - Arc flash PPE selection, inspection, and use, including rubber glove air testing. - Ladder safety training. - At least one crew member trained in CPR, AED use, and first aid. ## Emergency If someone is shocked: do not touch them. Shut off the power at the breaker or push them free with a dry non-conductive object. Call 911 and give the site address. Start CPR and use an AED if they are not breathing. Anyone shocked goes to the hospital, even if they feel fine. ## Official sources - [29 CFR 1926.416](https://www.ecfr.gov/current/title-29/section-1926.416) — Electrical — general requirements - [29 CFR 1926.417](https://www.ecfr.gov/current/title-29/section-1926.417) — Lockout and tagging of circuits - [29 CFR 1926.404](https://www.ecfr.gov/current/title-29/section-1926.404) — Wiring design and protection - [29 CFR 1926.405](https://www.ecfr.gov/current/title-29/section-1926.405) — Wiring methods, components, and equipment - [29 CFR 1926.95](https://www.ecfr.gov/current/title-29/section-1926.95) — Criteria for personal protective equipment - [29 CFR 1926.1053](https://www.ecfr.gov/current/title-29/section-1926.1053) — Ladders - [29 CFR 1926.21](https://www.ecfr.gov/current/title-29/section-1926.21) — Safety training and education - [29 CFR 1926.50](https://www.ecfr.gov/current/title-29/section-1926.50) — Medical services and first aid --- Source: HardHat Binder, operated by Leadspire LLC. Templates to be reviewed by a competent person before use; not legal advice; not affiliated with OSHA.