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Be careful not to drop your voltmeter or multimeter. Even a small fall can affect the tool’s ability to measure with accuracy. Always store your tools in their cases in a cool, dark place. Also, avoid touching the probes to each other while they’re connected to a circuit or another electrical component, and never tamper with anything inside the device.

While circuit breakers are designed to be reset after tripping, there isn't a strict countdown to when they will fail. The primary danger lies in a breaker tripping multiple times in a short period without allowing the components to cool down. Theoretically, a standard breaker might handle around 50 trips caused by simple overloading. However, this number can be much lower in practice. For instance, a high-current fault could damage a breaker to the point that it needs replacement after only two resets. Repeatedly resetting a breaker that trips frequently exacerbates the underlying problem by causing the electrical components, wires, and the breaker itself to overheat. This can lead to permanent damage, cause the breaker to trip unnecessarily in the future, and increase the risk of an electrical fire. If a breaker trips every few minutes, you should leave it in the 'off' position and call a qualified electrician for an inspection.

The size of your home will help determine the size of your electrical panel. Usually, the decision comes down to a 100-amp electrical panel versus a 200-amp panel. Smaller homes, especially those without an HVAC system, may be able to get by with a 100-amp panel. 

If you have a larger home or need to power AC, a 200-amp panel should be the best fit. It’s unlikely that you’ll need a larger panel than that unless you have a larger home or unique electrical needs, but an electrician can help you make the final call.

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.