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How far you can run underground electric depends on the wire gauge (generally AWG) and the circuit voltage. Too much voltage drop in an electrical circuit can negatively affect performance, so the smaller the voltage drop, the better. Ideally, it shouldn't exceed 3%. The smaller the wire and the longer the run, the more significant the voltage drop. 

For example, with a 120-volt circuit, you can run 60 feet of 12 AWG cable without losing more than 3% voltage. With a 240-volt circuit, you can run 120 feet of 12 AWG wire while maintaining a voltage drop of 3% or less.

Yes, the National Electrical Code (NEC) requires that outdoor Christmas lights be plugged into a ground-fault circuit interrupter (GFCI) outlet to prevent hazardous electrical shocks or an electrical fire. It’s a code violation to plug outdoor Christmas lights into a non-GFCI outlet, so be sure to follow these guidelines for a safe and successful installation.

The copper wire used in knob and tube wiring systems can last up to 100 years. However, it’s considered a dangerous and outdated wiring method because the cloth, fabric, or rubber insulation sheathing can become brittle and fall apart. Knob and tube wiring systems should be inspected if you’re considering buying a home with this type of wiring, or if you have problems with frequently tripping breakers, a sign that you may need to replace them.

On average, the cost to wire a new home ranges from $2 to $5 per square foot. The cost to rewire a house is around the same, ranging from $2 to $4 per square foot. Often, though, new wiring comes with lower overall costs since it’s much easier to access a home’s foundation.