Electricity is needed to run power tools and light the interior of a home during construction. However, during construction, most jobsites don't have built-in electricity. As a result, builders often have to rely on a temporary power source, such as a power pedestal, a temporary service, or a gas-powered generator. (Learn more about these options in a related article.)

Temporary power systems can be dangerous if they aren't handled correctly. Because many workers are unaware of the potential electrical hazards, they become vulnerable to the danger of electrocution. With a little knowledge, you can avoid electricity-related accidents on the jobsite and provide a safer working environment for your team.

Common mistakes made around electrical power supplies
There are many mistakes made on the jobsite that can lead to electrical shock, burns, cardiac arrest, or even death. It's important to recognize electricity-related safety issues and correct them before injury occurs. The following are a few items to look out for:

• Don't allow trades to overload normal-duty extension cords that are connected to temporary power.
• Make sure workers never get closer than 10' to power lines. Power lines carry a very high voltage. Use non-conductive wood or fiberglass ladders when working near power lines; don't allow workers to use metal ladders.
• Keep all extension cords that are plugged into temporary power away from standing or flowing water.
• Inspect extension cords to make sure they're not damaged or frayed and that they have a secure grounding lead. Only someone qualified to repair cords should try to fix one. Black electrical tape isn't a way to fix damaged insulation on extension cords.
• Confirm that all temporary power is properly grounded and protected from the weather.
• Make sure that all buried cables are marked properly to alert trades of their location.
• Be sure all work receptacles are GFCI-protected. A GFCI protects workers from shock if the grounding system fails. If the GFCI detects a fault that exceeds 5 milliamps, it shuts off the electricity in 1/40th of a second.

By understanding the common safety issues involved with temporary power systems, you can minimize the risk of onsite injuries. Before you select a temporary power source for your next jobsite, be sure to evaluate each option and choose the one that best suits your needs and complies with local and national safety codes.

More electricity and safety-related Best Practices® can be found in these three online courses from BuildIQ University: Jobsite Safety I and II, and Mechanicals: Electrical.