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A junction box is a container that holds electrical connections. The idea of a junction box is usually to keep wires safe, secure and free of dust, dirt and damp. A junction box is usually built within the layers of a wall so that all wires are concealed and the build looks neat and tidy.

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The function of a junction box is to suppress the spread of fire. In an electrical system the most likely spot for a fire to start is where wires are connected together. Loose connection of joined wires will create a resistance point. Over time with the current flowing through the connection it will heat and cool. This increases the resistance. Without repairs to this situation there will come a time when this heat will reach a combustible temperature. The junction box will suppress the spread of this fire by cutting off the oxygen supply to the fire. If the wire connection junction was in an open wall adjacent to combustible products, the fire could spread to wall studs and then combustion could overtake the whole house.

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Q: What is a junctions box?
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