Four-gang switch boxes can get complicated. In this box, two circuits enter, one leaves unswitched. The remaining circuit feeds one socket of a duplex receptacle directly, and the other socket via a switch loop through a remote humidistat switch. An intermatic EI600 switches the same source circuit, sending switched phase through kill switches: one to alley lights and one to a front yard post lamp.
Wire the grounds together first, as they will connect regardless of which circuit they may associate with. Next wire the neutral conductors together, taking care to keep neutrals of different circuits separate (GFCI and AFCI circuits will not tolerate mixed neutrals, since they will cause imbalanced return current through the protective device). Next connect the fixture phase wires to the switch controlling them. Finally, connect the proper source circuit phase wire to each switch (by this time, the number of loose wires should be very manageable).
Licensed Electrician Robert Monk Fun with four-gangs Copyright Robert Monk, 2012
Source: http://www.phillylicensedelectrician.com/fun-with-four-gangs/
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