Switched-mode power supply Questions
simulate this circuit &ndash; Schematic created using CircuitLab

One good reason to do this is that the internal fuse will be on the L terminal. This is somewhat safer because if the fuse blows the power-supply is internally isolated from the mains live. If the fuse blows when wired the other way around then the internal circuitry is still live and the neutral is disconnected.

In many countries the plugs are non-polarised and can be inserted either way around. This means your L and N are swapped. There is nothing you can do about this.

You'll be fine either way. Do connect the earth!

Links to my other answers on related topics:


In any electrical equipment having single ph 230 v ac supply ,if neutral and earth wire exchanged then what will be the consequence?
Why is it not advisable to fuse the neutral.
Correct Switch / Fuse Locations for Multi-SMPS Power Supply.
Should I use two fuses for 220V mains?
Why AC power plugs have three pins?