Question about PSU mains circuit

[neazoi]

Hello,
I have made this PSU mains circuit (attached) and I wonder if the second fuse and switch are needed at all, or if just one fuse and switch is enough?

 

[FlapJack]

In the USA we do not put a fuse or a switch in the 120vac neutral line. Our neutral is connected to ground at the circuit breaker box.

Our 240 volt power has two hot lines and it gets fused and switched in both lines.

 

[neazoi]

In the USA we do not put a fuse or a switch in the 120vac neutral line. Our neutral is connected to ground at the circuit breaker box.

Our 240 volt power has two hot lines and it gets fused and switched in both lines.

Thanks,
The input circuit is a balanced circuit, if you insert the plug into the mains power the other way round, then the poles are reversed. I refer to the mains plugs in Greece, because UK plugs (and I think US as well) cannot be inserted the other way round, because the GND is always a pole at the top of the mains plug. But I am not sure about this, that is why I wonder if a fuse/switch is needed on moth poles (NL) in my case.

 

[Venkadesh_M]

Actually neutral and earth are same if the fuse in the neutral side blown there is a more chance of shock that is the reason for avoiding fuse in neutral side.

If you don want to do compromise the change in L and N means use three pin socket.

also can you post a image of three pin socket used in UK.

 

[neazoi]

Actually neutral and earth are same if the fuse in the neutral side blown there is a more chance of shock that is the reason for avoiding fuse in neutral side.

If you don want to do compromise the change in L and N means use three pin socket.

also can you post a image of three pin socket used in UK.

Please see this page https://www.power-plugs-sockets.com/greece/
The power plug can be inserted in both ways, so there is no distinction between live and neutral. That is why I consider the fuse and switch in both wires?

 

[Venkadesh_M]

fine. If you use a two pin cable then you will need two fuses and DPST. The DPST is to ensure the phase is removed in off condition and two fuses because we don know which wire is going to be phase on equipment side.

 

[neazoi]

fine. If you use a two pin cable then you will need two fuses and DPST. The DPST is to ensure the phase is removed in off condition and two fuses because we don know which wire is going to be phase on equipment side.

Thank you, that is what I initially thought. Thanks a lot!
Also, how should I connect an indicator neon buld (on/off) at the input?

 

[Venkadesh_M]

Thank you, that is what I initially thought. Thanks a lot!
Also, how should I connect an indicator neon buld (on/off) at the input?

neazoi, but usually in any covered equipment there is no chance of touching the transformer input terminals whe power is ON so they will use only SPST and single fuse. because the transformer provides you full isolation. If you are going to use it in open condition then its better use a DPDT otherwise its not necessary.

connect the lamp in the output of DPST between phase and neutral with series resistance.