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You can test an electric fence with a multimeter, but you’ll need to set the multimeter to the correct voltage measurement—such as alternative current (AC) or direct current (DC) and range—depending on your fence. You can find the voltage type and range in the fence’s user manual.

There are several indicators that a single-pole switch is bad: the switch is warm or hot to the touch, sparks are sometimes present when turning the switch on or off, you hear a buzzing sound or other weird noise coming from the switch, the connected light flickers when you turn on the switch, and the light doesn't turn on at all with the switch. If you notice any of these, replace the switch or call a pro straight away.

The average lifespan of a home electrical system is anywhere from 30 to 70 years or more, depending on the type of system you have. Modern electrical wiring, like aluminum or copper, can last 50 to 70 years while older types may need to be replaced sooner. Additionally, circuit breakers tend to last anywhere from 30 to 40 years, while electrical outlets need to be replaced every 10 to 25 years. 

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.