[Lab] question about 120V wiring

[Darcy Whyte]

I have lots of those switched power supplies. They have L, N and ground. I
want to add an on-off switch. Should it be on the L or N side?

Picture:

http://mambohead.com/2011/05/switched-power-supplies-and-on-off-switches/

Thanks in advance!

Darcy
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