Installing a Backup Generator: In a power outage, a backup generator provides electricity to designated circuit breakers. When changing live fuses in the old days, electricians worked with one hand while keeping the other in their back pocket-this spared the heart by isolating the current to the nerves of the one hand in the fuse box. In a ground fault, current can flow into a single hand, zapping the heart as it passes through the body on its way to the ground. Ventricular fibrillation, the erratic, lethal spasm that occurs as electric current passes through the heart, happens when both of a person's hands touch hot and neutral conductors, causing the current to complete its circuit through the chest. From there, the system is grounded to the earth via buried ground rods. In a properly grounded system, appliances and metal boxes connect back to the grounding bus of the breaker panel. Grounding prevents a conductor not meant to carry current (such as the metal side of a clothes dryer) from causing injury if it's energized by a frayed hot wire. Used for 40-, 50- and 60-amp two-pole breakers large appliances. 10-gauge wireĪppropriate for a two-pole 20-amp breaker or a single-pole 30-amp breaker. Too thin for anything other than 15-amp breakers under small loads. WIRE GAUGE 12-gauge wireĬommon for low-demand connections to light switches and outlets, attached to either 15- or 20-amp breakers. 15-amp AFI breakerĪrc-fault-circuit-interrupter breakers can prevent fires caused by accidental electrical discharge. The 15-amp and 20-amp are all-purpose breakers, running everything from lights and outlets to garage-door openers. The 15-amp and 20-amp breakers often handle baseboard heaters, 30-amp serve water heaters and electric dryers, 40- and 50-amp are for electric ranges, and the 70-amp could serve a large air conditioner or a subpanel. Uses the entire 240 volts available to the panel. Play icon The triangle icon that indicates to play Double-pole breaker
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