# What is L and N

Discussion in 'Electronic Basics' started by John Fields, Feb 25, 2005.

1. ### John FieldsGuest

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From the .pdf,

"Wires are soldered from the base of the socket to line (L) and
neutral (N) on the PCB."

In the US, common 120V mains are obtained from one of the ends and the
neutral of a center-tapped 240V secondary of a transformer. 'L'
(line) refers to either of the ends of the transformer, and 'N'
(neutral) refers to the center tap.

Sometimes the separate ends of the transformer are referred to as 'L1'
and 'L2' in order to differentiate between them since they're 180° out
of phase with each other with respect to the center tap.

2. ### ChretienGuest

Sometimes I see on schematics L and N. I dont know that this is. Sometimes I
see it in relation to pic schematics. I dont use pic and dont really know
anything about it accept that it is a series of programmable chips often for
hobbyists.

Here is an example
http://eu.st.com/stonline/books/pdf/docs/10130.pdf

I have no intention of building this but just show it here as an one
example.

Regards

3. ### ChretienGuest

Thanks All.

I get it now.

Another diagram is here.
http://www.coilws.com/Switch Mode Power/30W_SMPS.htm

On a 120v AC socket (if the polarity is right), the L is the small rectangle
hole and the N is the large rectagle hole. Not to be confused with the 3erd
prong which is ground.(green)

Regards

4. ### JamieGuest

L = Hot side of your AC line, normally the Black wire.
N = Neutral, normally the white wire. this wire is the
one that is connected to ground in the US at some given
point out side your home, normally on the pole ground and