E-Mon E20-6003200J-D-KIT - Manual (Page 40)

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How do I know line from load?
Generally speaking, “line” is the power coming in or “upstream” to a circuit breaker/
fuse/disconnect/etc. “Load is the power going out (“downstream”) of the device that
interrupts power. If you put a voltage meter on each side (presuming that your switch/
breaker/fuse/whatever is working correctly), then when you switch it on and off, the
load side is what goes on and off and the line side is what stays hot no matter what
(see Fig. 29).
Fig. 29. Line/Load