Solder Connections When Possible

In standard 120 VAC house wiring, it is very unusual to solder connections. In low voltage systems, soldered connections should be made wherever possible. All wire to wire connections should definitely be soldered. Mechanical connections using wire nuts are OK for higher voltage systems, but these connections have too much loss for low voltage systems. Soldering assures a permanent, low resistance connection. Mechanical connections gradually oxidize over a period of time. While copper is a very good conductor of electricity, copper oxide is not. Gradual oxidation in mechanical connections increases their resistance. Remember, a single high resistance connection within the circuit will make the resistance of the entire circuit high. So get into solder. Once you've made a good solder joint, it's good forever.

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