these devices pre-installed.) Running an extension cord from non-GFCI areas such as bedrooms and hallways defeats this safety feature. Oral burns (above) cannot be prevented by GFCI. At poolside, not having a non-metallic fiberglass pole or net on hand to pull someone to safety in case the pool water is electrified, and the victim is still conscious. Furthermore, to not know where the circuit breakers for the pool are located. Failure to install a "feed-through" type GFCI to all electrical devices that are an integral part of a Swimming pool, or not testing it weekly. This is a particular concern due to the use of electric lights and pumps where persons are immersed in water. The GFCI has the typical "test" and "reset" buttons, but no plug-in outlets. A 12-volt system is safer, though not foolproof, as it is ultimately connected to the 120/240 volt power mains. Most electrocutions come from incorrectly grounded or bonded lights. This can send electric current through a pool light even if it is not turned on. Using an ordinary vacuum cleaner in wet or damp areas. Only a "wet vac" is suitable for this purpose. Overfilling its collection container is also unsafe. Not double checking polarity before doing a jump start, or attempting a jump on a frozen battery. Although 12-volt batteries used in vehicles are at a safe voltage, a short circuit can still cause various types of burns and an explosion. Failure to replace high-risk appliances of decades past with new ones (hand-held corded electric drills, blow dryers, etc.) Not inquiring about the voltage when traveling abroad for those residing in the Americas, Japan, and Taiwan (countries with 110-125 volts). This includes inter-American travel, as a few countries commonly use 220-240 volts. A matching electrical socket (power mains) does not necessarily mean the voltage is the same as one's home country. The doubling of voltage results in a very dangerous four-fold increase in power and heat. Not checking that dual-voltage small appliances have been adjusted correctly for 220-240 volts is also unsafe. Going near or under a downed power line, even if there's no direct contact with the wire. Also, not remaining inside your vehicle and waiting for rescue should a power line fall on it. See also Lightning safety Treatment First aid An electrically burned patient should not be touched or treated until the source of electricity has been removed. Electrical