Running 220-volt wiring depends on whether the wiring is being done in a home or a commercial building. Another aspect of 220-volt wiring that requires consideration is how the 220-volt wiring is attached to the appliance, machinery or other equipment. Different equipment use 220-volt outlets or direct links, but before running any electricity turn off the power supply or contact a professional electrician.
Running 220-volt wiring to residential outlet can be accomplish by running the 220-volt wire from the breaker box to a 220-volt outlet. Common appliances that use 220 volts through an outlet are the kitchen stove or laundry dryer. The 220-volt wiring has four different wires, black, red, white and green. Each wire is encased inside color insulation. All four wires have an outer covering of insulation, which is usually black or white. The black wire is a hot wire that carries 110 volts; the red is also a hot wire that carries 110 volts. Both the black and red wires must be run together to provide 220 volts of electricity to the appliance. The white wire is a neutral that completes the electrical circuit, while the green wire is the ground that prevents electrical shock when a power surge occurs.
Residential Direct Wiring
Normally all 220-volt appliances plug into an outlet, but the hot water heater will require you to directly wire the 220-volt wire. The wire runs from the breaker inside the main electrical panel directly to the water heater in the utility room. A junction box is located on the water heater. which allows you to connect the 220-volt wires. A piece of conduit must be run from a junction box located on the wall to the junction box on the water heater to protect the wire as well as prevent you from being accidentally shocked. The conduit from the wall junction box to the water heater junction box is commonly flexible conduit, so you can bend the conduit by hand.
All 220-volt wires running inside commercial buildings must be run through conduit. The conduit runs from the main disconnect box to other individual disconnects and then to the machinery requiring 220-volt outlet. The machinery or equipment has a 220-volt plug that either has three prongs or four prongs. Every wire, including the 110-volt wiring, must run through conduit. Conduit protects the wiring as well as people working near the power supply. The conduit can be flexible or rigid pipe. Electricians run individual wires through the conduit so more than one machine can be wired from the conduit run. The number of individual wires running through the conduit depends on how many machines or equipment require power in that particular location or area.
Commercial Direct Wiring
A lot of equipment requiring 220 volts of electricity is wired directly to the disconnect box. Again, all wiring must run through conduit when being installed in a commercial building. Direct wire is pulled through conduit to a junction box or electrical panel located on the individual machine or equipment. No outlet or plug is necessary when wiring this kind of 220-volt equipment. All individual wires have different colors, such a black, red, white and green. Some of the wires can be yellow, blue or striped with the different color combinations. As long as the wires have a tag or small label listing their uses, any wire color can be used.
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