power supply connection issues

I bought a used power supply that has no cord attached.
I went to the manufacturers website and the only info they had on it
was the same markings that are on the board of the power supply.
I was hoping that one (or more) of you intelligent people could help
me with this.
The marking for the input AC are N,L,G. All of which are together
in one terminal block.
I assume that the "G" is ground,(could be wrong), but what are the
other two?

Regards,
Jim