how do I know line from load?

Question

electrical wiring

Answer 1

generally speaking, "line" is the power coming in or "upstream" to a switch/fuse/disconnect/etc. "Load is the power going out ("downstream") of the device that interrupts power. If you put a meter on each side, (presuming that your switch/breaker/fuse/whatever is working correctly) then when you switch it on and off, the line side is what goes on and off and the line side is what stays hot no matter what.
Looking at the terminals, depending on the manufacturer, they may even be labeled...sometimes with "Line" and "Load" but more frequently with "L" for line and "T" for load. Also, it's common practice that the line side is on top and the load is on the bottom. This assumes both vertical installation and that the electrician chose to follow that convention (it's neither a standard nor code, so should not be relied upon, but tested to be sure).

Answer 2

Line And Load

Answer 3

Line will come from the power source and is usually hot all the time unless you turn off the source. Don't trust colors of wires I have seen things done that scare me, an audible no contact detector is a great help and much safer for home use, if the load is unplugged the hot side is line.

Answer 4

Line and load information above is correct. But, you never assume hot lines are black or red. White is often powered depending on the circuit, and people do make mistakes when installing wiring. Also, the colors on older fabric spun wiring are often indistuingishable. Always test with a VOM or similar before sticking your hand in an electrical circuit.

Answer 5

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RE:
how do I know line from load?
electrical wiring

Answer 6

well, William is right, but information is lacking. Line is the power to the point of utilization, Load is the power used. If you are installing a GFI to replace an existing receptacle, and only want that one protected, then attache the wires where it says line.

Answer 7

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In terms of a transmission system, line loading would refer to the actual load on the line. The loading could be measured in real power (Mw), Apparent power (Mva), or amps.

Answer 8

line always comes from power source load is
what you'll be pullin best way to remember especially on a gfi

Answer 9

basically, line is where the power comes from, load is where the power is going to. if you are wiring a GFI, all the outlets AFTER the GFI will be protected on the load side. use a tester to determine which black wire is hot. the black wire goes on the colored (brass) screw. be sure to turn off the circuit breaker when making the connections.

Answer 10

LINE=LIVE FEED VOLTAGE
Load=power out to device