Excessive Load
The switch may be handling too much power. Many switches carry a rating of 15 amps for use in 15-amp lighting circuits; however, many people think that all switches are the same and install them on 20-amp circuits. Such switches cannot handle the extra load safely and require replacement with 20-amp switches immediately.
Failing Switch
When switches wear out, they can arc slightly when turned on and off, causing a small spark and burn on the electrical contacts. Eventually, the contacts fail to meet properly, causing electricity to flow through a smaller area, generating heat. A switch in this condition is a fire risk and needs replacement.
Faulty Wiring
A loose or broken, but still touching, wire on a switch can still function but will force the electricity to take a smaller than intended path through the wire. This creates excessive heat. Both of these conditions require immediate repair, as they present a fire risk.
Dimmer Switches
A dimmer switch is the exception to the rule of what to do when facing a warm wall switch. These switches do intentionally get warm, as dissipating the power of the electricity to lights is how they function. If in doubt about a dimmer switch, refer to the manufacturer’s temperature ratings for the switch.
The Drip Cap
- A properly installed and loaded wall switch should never get much warmer than room temperature.
- When switches wear out, they can arc slightly when turned on and off, causing a small spark and burn on the electrical contacts.
- This creates excessive heat.