Re: How to break up a circuit with a shared neutral?
Although balanced loads or nearly balanced loads work, I always recommend against shared neutral in a residential application. As and example one circuit feeds the bathroom which has a vent fan, a ceiling light, a vanity light, etc. When every thing is on the draw is say 12 amps. Ont the other branch you have an attic vent fan drawing 12 amps. every thing is OK until the neutral break or bad connection, and you have one 60 watt light on in the bath and the vent fan is running. Now you are running 240 volts through the circuit, dropping 220+ volts on the fan and 18+ volts on the light and the circuit is drawing over 22 amps. A 20 amp breaker may or may not trip and you will burn out the light or the attic fan. It's very difficult to maintain balance loads in a residential application.
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