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Several signs can indicate a light switch is bad. If the switch feels loose, slides down after you flip it, or requires multiple flicks to turn the light on, it may be failing. Other common indicators include flickering lights or a general failure to turn the light on or off. Pay attention to any unusual sounds, such as crackling, buzzing, or popping when you operate the switch. More serious signs, which can present a fire or shock hazard, include the switch feeling excessively warm or hot, sparking, smoking, or emitting a burning smell. If you notice any of these dangerous signs, stop using the switch immediately and call an electrician.

To prevent a plug from overheating, always ensure that the electrical load connected to the plug does not exceed the plug's capacity. If the plug feels hot to the touch or emits a burning smell, immediately shut off the circuit breaker and unplug all devices from the hot outlet. Prevent electrical fires by avoiding using extension cords or adapters with the plug, as they can cause it to overheat due to increased resistance. Additionally, ensure that the plug is properly inserted into the outlet and that the outlet is not damaged or loose. 

It can be safe to buy or live in a house with knob and tube (K&T) wiring, but only if the system is in good condition, functional, and has been thoroughly inspected and approved by a licensed electrician. Never purchase a home with K&T wiring without getting a professional electrical inspection first.

Key considerations include:

• Safety and Condition: An inspector will verify that the wiring is safe and has not deteriorated. Over time, the insulation can wear away, leaving exposed wires that pose a significant fire or shock hazard.

• System Capacity: The electrical service should be at least 60 amps. However, even at this capacity, K&T systems often struggle to handle the demands of modern appliances and electronics.

• Lack of Grounding: Knob and tube wiring is an ungrounded system, which is a safety concern for many modern devices.

• Ongoing Maintenance: If you live in a home with K&T wiring, it's recommended to have it inspected by an electrician every one to two years to ensure it remains in safe working order.

Ultimately, any inspection or modification of a knob and tube system should always be performed by a certified professional.

Whether or not a pool needs a dedicated circuit depends on the electrical needs of the motor, lights, and pump. Keep in mind that pool motors can use a lot of electricity. A dedicated circuit can prevent the breaker from tripping whenever you use the pool. A small motor for an equally small pool may only need a GFCI outlet. It’s best to plug it directly into the outlet rather than using an extension cord. You should also consult an electrician to ensure your pool’s electrical system is in accordance with local regulations.