This is a “rule of thumb” without doing a voltage drop calculation. In the specifications of most of the commercial and industrial jobs we wire they require an increase in branch circuit wire size if we exceed 100 feet. There is no limit to the number of boxes or splices, only a length limit. Junction boxes also must be covered with solid covers with no holes. Junction boxes must be installed where they are always accessible never install a junction box in a concealed wall or ceiling space where the box cannot be accessed in the future. This level of protection is needed to prevent fires and to maintain solid, reliable connections that stay tight over many years. What’s the point of a junction box?Ī junction box is an enclosure that protects a connection (the junction) of two or more wires carrying electrical current. How many wires can be connected in a junction box?įor example, the smallest 2-by-4-by-1-1/2-inch-deep box can comfortably splice only two cables (four or five conducting wires), while the largest 4-by-4-by-2-1/8-inch-deep boxes can handle as many as four to six cables (up to 18 individual conducting wires). Like any electrical box, it should be installed so that the edge of the opening is flush with the wall. You should install the box with the opening facing out from the wall so all the wires inside are accessible. You’ll need a junction box if you can’t make the connections inside an existing electrical box. … The old, informal method of splicing wires together with electrical tape should never be used. Instead, all splices must be contained within an approved junction box or fixture electrical box. Electrical splices can never be left on their own in a wall or ceiling cavity.
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