What are typical aluminum service entrance wire/cable sizes for the electrical service to a house?.What causes copper wires to turn green or black in an electric panel?.Is it alright to just put wire nuts on the end of unused or abandoned NM-cable or wiring?.What is the maximum spacing requirement for securing NM-cable (nonmetallic-sheathed cable)?.Can a short circuit cause a high electric bill?.Which house appliances need a dedicated electrical circuit?.Here’s links to a collection of our other blog posts about ELECTRICAL WIRING: These requirements do not apply to low-voltage wiring, such as the wires running from a thermostat to an air conditioning system.Īlso, see our blog post Does a wire nut connection need to be wrapped with electrical tape? A more typical example would be wire splices in an open electrical box, often overstuffed, as below. In the photo above, they didn’t even bother to use wire nuts. It should be installed at an accessible location.The cable or wires should be secured where they enter the box, so that the splice cannot be pulled apart by tugging the cable from outside the box.The splice must be made with approved electrical connectors (typically wire nuts) that are rated for the wire size and number of wires connected.The splice must be made in a junction box or enclosure rated for the use. The specific requirements of an electrical splice are: The box can be as big as the main electric panel or small as a receptacle box in the wall. So the number-one basic safety requirement of the electrical code is that wire connections should be secured in a fire-resistant box. Also, unprotected wire connections can be a shock hazard. When electrical wire connections come apart, the sparking and heat from the electricity jumping between loosened wires can easily light any adjacent flammable material on fire. The connection of two or more wires is called a “splice,” and an “open splice” is when it is not contained inside a box.
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