This safety measure prevents fires that can occur when the wires overheat and also protects people from getting shocked by live wires. Here at Emergencybrisbaneelectrician. The electrical code requires wire connections to be enclosed primarily because loose connections present a fire hazard.
Even if you securely twist the wires together, screw on a wire cap and wrap the ends with electrical tape, there is still a possibility that current surges can overheat the wires. Over time, this may degrade the tape and wire caps, and insulation or framing may ignite. Installing an electrical box is a precursor to adding any device, like a switch or receptacle, to a circuit.
Boxes can be made of metal or plastic, and you usually screw or nail them to a stud or rafter, although you can anchor remodeling boxes directly to the surface of drywall.
The only difference between a box for a circuit device and a junction box, or J-box, is that the latter serves no other purpose than to enclose spliced wires. Its opening is covered, not by a circuit device, but by a flat metal cover. Electricians usually minimize the number of junction boxes needed for wiring. They plan the circuitry so that they can make connections for branch circuits inside a switch or receptacle box, using a box big enough to accommodate all the wires.
Careful planning usually eliminates the need for a separate J-box when wiring a room from scratch, but one or more may be necessary when adding to existing wiring. A J-box may also become necessary in other circumstances, such as when a miscalculation results in the need for splicing because of a cable that is too short to reach its destination.
When upgrading the wiring for a room, you may find it necessary to tap into a wire to add a branch circuit for a light or outlet.
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We and our partners process data to: Actively scan device characteristics for identification. The general rules on enclosing conductor splices in a box or other enclosure come from Part 1 of NEC Article , Section NEC That being said, the portion of NEC Section Nothing is mentioned in Article regarding compliance with NEC If Class 1 circuits are used in the security system and splices are made, the splices must be enclosed in a box or other acceptable enclosure.
If Class 2 or 3 circuits are used in security system wiring, no junction box is required but the splice cannot simply be twisting the conductors together and covering them with electrical tape. Below is a sample of NFPA
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