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The type of solder that is to be used on electrical equipment should have a rosin core. Acid core solder is not recommended because it the acid gets inadvertently placed on other components, the acid will start to corrode the other components. This type of soldering usually pertains to printed circuit (PC) boards.

The electrical code does not allow the use of soldered connections as it did when knob and tube wiring was in fashion. This is because of the high amperage generated by fault currents that would melt the soldered connections and open circuits that should remain closed during the fault. This is mainly to do with the soldering of neutral connections.

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