Consequences of Swapping L and N Wires on a Mounting Power Supply

Question

Hello, I have a mounting power supply and there are phase and zero markings on it, which if I swapped them, the power supply looks like the one below.

djlukas · Answer

If it works, nothing will change. But if the fuse is on the phase line, it may fail in some short circuits without the fuse tripping. Why do you want to swap the power supply at all?

D214d3k · Answer

It depends what's inside, but from nothing, through a slight digging of the current if it has some advanced anti-interference filters, by throwing away the protections if the 3-wire connection is correct, up to the line on the housing and life threatening in the absence of separation or damage and at the same time lack (continuity ) of the protective conductor. Connect well or not at all.

Marcin7254 · Answer

I don't want to change anything, I just have a plug that looks the same on both sides.

Ture11 · Answer

So a plug without a protective contact? Your power supply has a ground point in the screw connection - for a reason.

Marcin7254 · Answer

Yes, my plug does not have a grounding cable and what's worse, my house is of an old type and there is no grounding pin in the sockets either.

retrofood · Answer

So it's high time to change that. And if you're looking for style advice it's not possible, it's a shame to bother people.

Marcin7254 · Answer

Okay, theoretically, nothing should happen, after all, only the housing is grounded, right? besides, there is no transition between the contacts and the housing, so theoretically there should be no voltage on the housing, although my lack of grounding is not an advantage because I do not make a short circuit with an oscilloscope

at most, the electricity will "kick" me a bit once I put my finger where there are traffic jams from the so-called "strength"

Ps. Retrofood I like your manipulation of words

strfind · Answer

And that's where the whole snag is. In the event of damage to the insulation or any element inside that touches the housing, in the absence of grounding of this housing, the voltage will be on it, e.g. 230V. If it is grounded then the circuit breaker/rcd should trip. And that is why devices in protection class I should not be connected to networks not adapted to such devices.

kkknc · Answer

It's a pulse power supply. So it will work the same. But the manufacturer gave the designation for something.

Marcin7254 · Answer

I do not know much about electricity, but about electronics, yes, I do not consider myself to be some professional because I am far from it, but I also doubt that some transistor or anything else will magically bend when touching the housing, it will be more likely to just show the so-called magic smoke

strfind · Answer

I just gave a general example of why the enclosures of Class I devices are grounded. I bet you and some other devices you have incorrectly connected.

zbich70 · Answer

Dude, just because you've been kicked once doesn't mean you've become electric-proof. The next kick could kill you. So take the advice of those who know each other and apply it.

Marcin7254 · Answer

So what advice do you offer me? :D Added after 2 [minutes]: It's hard not to guess after the fact that I don't have a grounding pin in the house

Marcin7254 · Answer

Maybe we'll end on that

retrofood · Answer

On the assumption it is the right decision. However, for those who will visit here someday, I will add that Your theory doesn't have to be, and most of the time it's not true. Already at the power supply input there is a capacitive voltage divider, the center of which should be connected to the protective or protective-neutral or neutral conductor, otherwise the housing will be constantly half the supply voltage and in an efficient device! Therefore, it is absolutely necessary to adapt the power supply system to the needs of the device and it should be done immediately ! The technical costs of this are low, and how to do it depends on the type of installation. Electricians will know how it works. In addition, devices without a factory power cord with a plug are often sensitive to L and N reversal, so you should try to avoid such a power supply by making a permanent connection. We use other types of devices for transfer.

Consequences of Swapping L and N Wires on a Mounting Power Supply

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