Temporary electrical systems are essential on most construction sites, but when installed or used incorrectly, they can cause serious injuries or fatalities.1 The goal of this talk is to cover basic requirements and provide safe practices to prevent electrical incidents.
What is temporary power?
Temporary electrical power refers to a short-term system that supplies electricity during construction, remodeling, maintenance, renovation or demolition. Components of temporary electrical power provide power for tools, lighting and equipment on jobsites, including:
Portable generators or temporary service panels
Distribution boxes, cables and cords,
ground-fault circuit interrupters (GFCIs), etc.
Key Requirements for temporary electrical power:
Qualified Electrician: Only qualified electricians should install, modify or repair temporary power systems. These systems must be installed according to NEC, OSHA and NFPA 70E standards.
GFCI Protection: All 120V/125V receptacles must be protected by Ground Fault Circuit Interrupters.
Physical Protection: Temporary power equipment should be protected from vehicle traffic and must be suitable for environmental conditions. In addition, all unused openings should be covered or closed.
Regular Testing: Test GFCI devices at least monthly and document results.
Timely Removal: Temporary power must be removed immediately upon completion of construction, remodeling, maintenance, repair or demolition.
What you can do
Inspect Before Use: Check cords, plugs, and boxes for damage.
Never Bypass Safety Features: Do not use damaged or altered equipment.
Ground Everything: Ensure proper grounding for all tools and cords.
Keep Power Distribution Boxes (spider boxes) Elevated: Protect from water and keep off the ground.
Report Problems: Tag and remove unsafe equipment immediately.
Avoid Hazards:
Do not run flexible cords through windows or doorways unless they are protected from pinch points and damage.
Do not daisy-chain extension cords.
Protect all flexible cords from damage – sharp corners, projections, etc.
Avoid trip hazards. Do not run cords across walkways.
Use appropriate sized and rated cords for the electrical load or equipment.
Unplug and de-energize equipment, from temp power, before performing maintenance, servicing, etc.
Temporary lights shall not be suspended by their electric cords unless cords and lights are designed for this means of suspension
Why it Matters
Electrocutions remain one of the leading causes of death in construction, with dozens of fatalities and hundreds of injuries every year1,2. Temporary power makes work possible but only when used safely. Following these steps to protect yourself and your team.