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The cost to install or replace a circuit breaker depends on the price of the unit itself and the complexity of the installation. A new circuit breaker typically costs between $10 and $100, with standard breakers being the most affordable and GFCI or AFCI types costing more. If you are upgrading to a higher amperage, a 200-amp circuit breaker can cost between $250 and $350. The average total cost for professional installation is around $700, but this price varies. A simple replacement into existing wiring will cost less than a more complex project that requires opening walls, running new wires, and securing permits.

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.

It’s generally not recommended to run electric to a shed above ground, and you should instead run electric lines underground via a conduit. This job, like all electrical jobs, is best left to a pro, as they’ll need to ensure everything is installed safely and that they don’t run into any other utility lines underground. 

Yes, splicing wires can cause a fire if the splicing is done incorrectly. This is why splicing wires is a task best handled by electricians. One of the most common mistakes made when splicing wires is not using a wire connector. Without a wire connector, electricity flows unsheathed and can result in a home electrical fire.