Consumers who have purchased portable generators to provide electricity in the event of a power outage during a storm or other disaster must use safety precautions. Portable generators can be hazardous if used improperly. The hazards are: (1) carbon monoxide (CO) poisoning from the toxic engine exhaust and (2) electrocution from connecting the generator to the home electrical wiring system.
Never store gasoline in the home. Gasoline, kerosene and other flammable liquids should be stored outside of living areas in properly labeled, non-glass safety containers. They should also not be stored in a garage if a fuel-burning appliance is in the garage. The vapor from gasoline can travel invisibly along the ground and be ignited by pilot lights or arcs caused by activating electric switches.
If at all possible, avoid connecting the electrical output of the generator into the house wiring. Instead, connect individual appliances that have their own outdoor rated power cord directly to the receptacle outlet of the generator, or connect these cord-connected appliances to the generator's electrical outlet via a suitable, outdoor-rated extension cord having a sufficient wire gauge to handle the electrical load.
If connecting into the house wiring is necessary on a temporary basis to operate permanently wired equipment, such as a water pump, furnace blower/controls, room lighting, etc., there are important steps that require the utmost care to avoid electrocution. In some locations, the local utility company may offer to install a device at the electric meter socket to permit their customers to connect a portable generator to the household wiring during periods of power outages. If that service is not available or chosen, another method is to have a qualified electrician install a manual transfer switch.
A transfer switch permits transfer of the load from the household power source that is normally supplied by the electric utility over to the portable generator. The transfer switch should be certified by UL or other independent test lab for this application, and be mounted within an electrical box. Transfer switches and related accessories designed for connecting a standby system are available from electrical supply stores. These accessories equipment includes:
When properly installed, the transfer switch will isolate the circuits supplied by the generator from those normally supplied by the utility. This prevents inadvertently energizing circuits in both systems, and reduces the possibility of electrocution resulting from contact with conductors presumed to be de-energized.
Do not operate more appliances and equipment than the output rating of the generator.
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