Home Electrical Wiring


Posted on Feb 5, 2014

Whether you are considering a backup power system, want to add another electric circuit, or are going to install a new appliance, it is important to understand the home`s electrical wiring basics and applicable codes. First, let`s briefly review how electricity gets to your house. Most residential and light commercial homesin U. S. have a single-phase


Home Electrical Wiring
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3-wire 120V/240V service. Itconsists oftwoinverted relative to each otherlines and a grounded neutral. Connecting an electric load betweenany line and the neutral yields 120 volts AC. Connecting between both lines yields 240 volts AC (see the diagram). The two 120V buses are derived from a step-down distribution transformer, which isusually mounted on a pole. Its secondary winding has a grounded center tap connected to neutral wire. The two endterminals are electrically hot  with respect to the neutral. Note that both lines are derived from the same utilityphase. That`s why such configuration is often called split phase. The threeconductors go from the pole toyour electric meter. From the meter they run to the panel containing the main service disconnect. From there thelines go to magnetic circuit breakersthat protectindividual branches. The branch breakers can be mounted in a separate distribution panel or can be incorporated into the main panel. The individual outlets in the homes are normally NEMA 5-15R duplex. The National Electric Code (NEC ®) 2014 specifies ten locations in dwelling units where the outlets should have GFCI (article 210. 8). Particularly, GFCI should be in bathrooms, garages, kitchens, etc. The article 210. 12 additionally requires special arc-fault circuit interrupters (AFCI) for most types of rooms. Of course, if you don`t touch it you are not required to upgrade, but if you modify, replace, or...




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