Temporary power, cords and overhead lines are part of every job. Here is how to keep electrical hazards under control.
In this article
- Electrical hazards are everywhere on site
- Use GFCI protection
- Inspect cords and tools
- Overhead power lines
- Underground lines
- Temporary panels
- Water and electricity
- Lock out before working on circuits
- Train non-electricians too
- Double-insulated tools
- Energized work is the exception
- Frequently asked questions
- Frequently asked questions
Electrical hazards are everywhere on site
Temporary power, extension cords, power tools, overhead lines and exposed wiring are part of daily work. Electrocution is one of OSHA's Focus Four hazards, and many incidents involve workers who are not electricians at all.
Use GFCI protection
OSHA requires contractors to protect workers from ground faults on construction sites, either with ground-fault circuit interrupters or an assured equipment grounding conductor program. GFCIs are the most common choice and should be tested regularly.
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Inspect cords and tools
- Remove cords with cuts, exposed wires or missing ground pins.
- Do not run cords through doorways or under vehicles.
- Use cords rated for the load and for outdoor use.
Overhead power lines
Ladders, scaffolds, cranes and booms that contact overhead lines can kill. Keep the required clearance, assign a spotter for equipment near lines and call the utility when work must happen close by.
Underground lines
Call 811 before digging and hand-dig near marked utilities. Striking a buried line can electrocute the operator and nearby workers.
Temporary panels
Keep temporary panels closed, labeled and protected from water. Only qualified people should open or modify them.
Water and electricity
Wet conditions increase shock risk. Keep cords and tools out of standing water and use equipment designed for wet locations.
Lock out before working on circuits
When work involves building circuits or equipment, follow lockout/tagout procedures and verify that the circuit is dead before touching it.
Train non-electricians too
Every worker should recognize damaged cords, know where GFCI protection is and understand the danger of overhead lines.
Double-insulated tools
Use double-insulated or properly grounded tools, and never remove a ground pin to fit an old outlet. Inspect tools before each shift and remove damaged ones from service.
Energized work is the exception
Working on energized equipment should be rare, justified and done only by qualified electricians with the right protective equipment and procedures. De-energize whenever possible.
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Frequently asked questions
Are GFCIs required on construction sites?
OSHA requires protection against ground faults on construction sites, using either ground-fault circuit interrupters or an assured equipment grounding conductor program. GFCIs are the most common choice.