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How many string lights can be on one outlet depends on a number of varying factors, including the total wattage of your circuit, the type of lights, the energy needs of the lights, and cord specifications. It’s better to play it safe here to protect your circuit, so figure out the max wattage of your circuit, compare that to the lights, and move on from there. Generally speaking, LED string lights require less energy than incandescent bulbs, translating to a higher number of lights per circuit. 

Moving an electrical meter in your home depends on what your electric utility company allows. If you only want to move it a few inches, that may be no problem or only incur light fees. If you want to move it a significant distance, you may need to arrange a utility inspection and get permission, or your utility company may prevent it altogether.

Before the widespread use of PVC, affixing a ground wire to plumbing pipes was generally considered to be an acceptable workaround. Nowadays, not so much. There are plenty of nonmetallic water pipes and fittings out there, so any ground previously provided by the metallic piping would be interrupted in these cases, which is dangerous.

While the National Electrical Code (NEC) does not set a strict limit, a common guideline is to have a maximum of eight outlets or receptacles on a 15-amp circuit. This rule of thumb, which equates to about one outlet per 1.5 amps, helps keep the total electrical load safely below 80% of the circuit breaker's capacity. It is important to consider the power demands of any devices or appliances that will be plugged in, as overloading a circuit can lead to tripped breakers or create a fire hazard. To ensure the safety and code compliance of your electrical system, consult with a licensed electrician.