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A #3 copper conductor will limit the voltage drop to 3% or less when supplying 5 amps for 1500 feet on a 120 volt system.

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Q: What size wire do you need to feed a 5 amp load run 1500 feet from the main at 120v?
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How much power does a load drawing 15A with 120V across it consume?

The formula you are looking for is W = A x V.


Will 16gauge wire handle a 1500watt 120 volt heater?

I = W/E. Current is equal to Watts divided by Volts. 1500/120 = 13 amps. A #14 is rated at 15 amps. A conductor can only be loaded to 80% for a continuous load so 80% of 15 equals 12 amps. Too small for the 1500 watt load. A #12 conductor is rated at 20 amps times 80% equals 16 amps for a continuous load. To answer your question, no, a #16 conductor will not handle a 1500 watt load.


What size circuit breaker should be used on 125 feet of 4 AWG power feed?

The circuit breaker is used to protect the conductor that is connected to it from an overload condition. On a motor load the breaker has to be sized 250% of the motors full load amperage. Some circuits can be only loaded to 80% capacity and this is governed by the sizing of the breaker. Without knowing what the load amperage is, this question can not be answered.


Can you use aluminum service cable to feed a sub panel?

Yes, as long as it has the necessary ampacity for the load and is properly fastened at each terminal. For example, we have a 4/0 aluminum cable feeding our 200 A subpanel 120 feet away.


Can a 240V thermostat be operated using 120V to the themostat and them wired to a 120V heating element?

a 240 volt thermostat (or any 240 volt switch) is generally a 2-pole switch which means it breaks both wires going to the load You can use it for 120 volt loads by using one of the two poles for the "hotleg" wire and just splice through the neutral wire this is a 2-pole switch (the two blades move as one handle) line___.__ \___._ load line___.__ \___._ load The second pole goes unused and gives you a spare for the future