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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.

The total cost to install a 120V outlet will depend on the type of outlet you choose, labor costs, and any customizations. Standard 120 volt outlets usually cost $3 to $5 each. But say, for example, you customize your 120V outlets with USB ports, you’ll end up paying a bit more at $13 to $22 per outlet. When it’s all said and done, you can expect to pay around $175 for each new 120V outlet and $125 each for replacement.

A larger heater requires a larger breaker—unless there’s one already installed. The longer answer to this question is more nuanced. Do you place demands on the heater at the same time as running other heavy-duty appliances like ovens and washing machines? Do you live in an older home that may not have considered the higher electrical demands we have now? Breakers need to be sized at 125% of the load. To find that load, you should call a local electrical pro.

The main reason outlets become loose is because the contact points have started to wear down after years of use. Occasionally, poor wiring can cause heat or sparks that can damage the outlet and cause it to become loose. Either way, if your plugs slide out after being inserted into the outlet, it’s time to replace it.