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Common signs of faulty electrical wiring include frequent circuit breaker trips, flickering or dimming lights, burning smells near an outlet, buzzing or humming sounds, electrical shocks or tingles when handling outlets of appliances, and hot or discolored outlet switches. If you notice one or more of these signs, hire a licensed electrician for an average cost of $50 to $100 per hour to diagnose and make necessary repairs.

It is possible to change a light fixture by only flipping the light switch, but it’s better to be safe than sorry. Exercising extra caution when working with electricity is always important. Take the extra few minutes at your electrical box to cut the power at the circuit breaker. Once you’ve flipped the circuit breaker and the light switch, use a voltage tester to confirm the power has been turned off.

Yes, one wire is always hot on the 3-way switch, meaning it carries the electricity from the power source to the switch. If you have a 3-wire cable in your home, you have two hot wires, or line wires, coming from the power source. Typically, you’d connect the hot black wire from the power source to the traveler wire and the hot red wire from the power source to the first 3-way switch. For the second 3-way switch, you’d then connect the hot black traveler wire to the switch.

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.