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Can someone please help with an electrical wiring diagram for the drawing below?

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  • 1 month ago

    You'll need to give some context. What's the application, what's the load. What's S3 and S4?

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  • 1 month ago

    A guess would be power to a system turned on and off with control wires.

    Source is power, like AC.  Load is fan.

    Signal wires S3 and S4 are for inputs from a pair of thermostats, like at two zones of a house.  That explains why there are two sets each having an S3 and an S4.  There might be relays inside that junction box.

    That is all that can be guessed from your diagram.

    Source(s): manufacturing engineer for electronics company.
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