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A splice box is the same terminology as a junction box. 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.

Depending on the type of junction box, it will suppress the spread of this fire by cutting off or limiting the oxygen supply to the fire.

If the wire connection splice was in an open wall, adjacent to combustible products, the fire could spread to wall studs and then combustion could overtake the whole building.

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10y ago

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