Wall Switches Installed Directly On Combustible Substrates Can Lead To Poor Contact And Heat Buildup.
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The copper contacts inside the Wall Switch circuit carry the current of the lighting or socket circuit. Frequent switching on and off will cause oxidation of the contact surface. Increased contact resistance leads to overheating in this area; under a 10A load, a switch with poor contact can reach a temperature rise of over 80°C. The ignition point of the wood substrate is around 260°C. Prolonged heat radiation causes the wood's internal moisture to evaporate, and the carbonization of the fiber structure lowers the ignition temperature. The switch box is only insulated from the wooden board by a thin plastic panel, allowing heat to be continuously conducted and ultimately ignite the substrate.
