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A Ground Fault Circuit Interrupter (GFCI) works by detecting any loss of electrical current in a circuit. When a loss is detected, the GFCI turns the electricity off before severe injuries or electrocution can occur. A painful shock may occur during the time that it takes for the GFCI to cut off the electricity so it is important to use the GFCI as an extra protective measure rather than a replacement for safe work practices. GFCI wall outlets can be installed in place of standard outlets to protect against electrocution for just that outlet, or a series of outlets in the same branch. A GFCI Circuit Breaker can be installed on some circuit breaker electrical panels to protect an entire branch circuit. Plug-in GFCIs can be plugged into wall outlets where appliances will be used and are commonly found in bathrooms. Another common use for GFCI is for pools and hot tubs.
Test the GFCI monthly. First plug a "night light" or lamp into the GFCI-protected wall outlet (the light should be turned on), then press the "TEST" button on the GFCI. If the GFCI is working properly, the light should go out. If not, have the GFCI repaired or replaced. Reset the GFCI to restore power. If the "RESET" button pops out but the light does not go out, the GFCI has been improperly wired and does not offer shock protection at that wall outlet. Contact a qualified electrician to correct any wiring errors.
Power tools used incorrectly can electrically hazardous. Switch tools OFF before connecting them to a power supply. Disconnect power supply before making adjustments. Ensure tools are properly grounded or double-insulated. The grounded tool must have an approved 3-wire cord with a 3-prong plug. This plug should be plugged in a properly grounded 3-pole outlet. Do not use electrical tools in wet conditions or damp locations unless tool is connected to a GFCI. The operation of power tools might ignite flammable substances and in can cause an explosion near certain vapors and gases. Never use extension cords as permanent wiring. Use extension cords only to temporarily supply power to an area that does not have a power outlet. Keep power cords away from heat, water and oil. They can damage the insulation and cause a shock. Do not allow vehicles to pass over unprotected power cords. Cords should be put in conduit or protected by placing planks alongside them. Check power cords and plugs daily; discard if worn or damaged. Keep power cords clear of tools during use.