L And N Wires

Wires run underground may be run in plastic tubing encased in concrete but metal elbows may be used in severe pulls.

L and n wires. Between l1 n l2 n l3 n you would get phase wire voltage divided by 1 73. No connection should be made at additional sub panels. Can i just connect a cut off extension cord to the ac n and l terminals and does polarity matter. The light fitting is a hallogen wall light and the black wire is going into the connection that says l and there is a white wire going into the connection that says n i am not sure which one of these is positive and which one is negative.

Does anyone else out there know. R2 l2 r1 l1 l2 r2 square triangle circle triangle. Wiring in exposed areas for example factory floors may be run in cable trays or rectangular raceways having lids. I assume they mean live and neutral but i want to be sure.