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Yes, tamper-resistant outlets are a safe and effective way to protect children from electrical hazards. They feature a spring-loaded shutter that blocks the outlet slots when not in use, preventing a child from inserting foreign objects. While they are the safest option available, it's important to note that few things can be considered truly 'childproof.' Children may still try to imitate adults by inserting a plug, so constant supervision around any electrical device is recommended. Tamper-resistant outlets are a much safer solution than childproofing covers, which can be removed by children and may pose a choking hazard.

You can install a three-prong outlet without connecting any ground and plug in three-prong electronics into that outlet. The devices will function normally, but you won’t get any of the protection that grounding provides, so there’s an increased risk of serious problems if something goes wrong.

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.

There are several tools available to help prevent electrical fires. First, ensure that you have GFCI outlets installed in necessary areas, along with an AFCI, which is a circuit breaker that can help prevent arc-faults. Investing in surge protectors is also wise, as they can safeguard your appliances and other items against power surges that may overload your outlet and cause sparking.