When the wiring is complete, the respective outlets for 110v and 220v power are different as well. In every circuit with a white wire present, the white wire is always neutral. The red and black wires in 220v circuits carry 220 volts across each other but 110v in relation to the neutral, which is the white wire in a four-wire cable, leaving the green or bare copper wire for grounding the circuit. With 220v wiring, both three and four-wire setups are possible. Basic Wiring of BothĪ typical 110v wiring schematic requires three different wires: hot, neutral, and ground. Appliances, such as dryers, certain oven ranges, heavy-duty stationary power tools, and stationary compressors will likely require a 220v power source. While most consumer goods, including portable electronics and most appliances, run on 110v power, some require 220v. However, you should still use caution especially when you wire 220v. They both are grounded thus, they have safety features built into them. Regular power outlets found throughout a home are wired to 110v while only a few outlets are wired to 220v. Homes in the United States are wired for both 110v and 220v use. So although it's true that 220v requires less current to provide the same amount of power, as noted above, it can still carry much more current and poses a higher risk of serious injury. Since the human body has a constant resistance, higher voltage means higher current and therefore has a higher potential to kill. While both high amperage and voltage can mean danger in the event of an electric shock, the amount of amperage required for a fatal shock can be as little as 80mA.
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