RCD keeps tripping. Perhaps i've wired it incorrectly?

[Startn]

Good afternoon!

In my house, I have a three-phase power system and this RCD that's rated for 40 A max and 30 mA leakage current. It keeps constantly tripping on loads larger than a phone charger (ie an electric kettle or toaster). This house is to EU standards (I live in Latvia).

I'm wondering if I wired the RCD correctly or if that's not the correct way to use a three-phase RCD (perhaps I should replace it with three one-phase RCDs).

If it's the correct way to wire an RCD, then it might be an N-GND fault. If this is the case, then how would i go about troubleshooting this issue with just a multimeter?

I'm attaching a picture of how I wired my circuit board.

Thank you in advance for your help.

 

[Startn]

An update: I just tested the rcd with "test" button, and it didn't trip. Lights were on and everything. Perhaps a faulty RCD?

 

[littlespark]

Check the wiring diagram that came with the rcd, it may be that the incoming and outgoing cables are mixed up.

Having three individual RCDs, one for each phase, would mean you only lose part of your installation if one trips.
Not if you have any 3 phase loads, of course.

Faulty RCD is still a possibility.

 

[Startn]

, one for each phase, would mean you only lose part of your installation if one trips.
Not if you have any 3 phase loads, of course.

Check the wiring diagram that came with the rcd, it may be that the incoming and outgoing cables are mixed up.

Having three individual RCDs, one for each phase, would mean you only lose part of your installation if one trips.
Not if you have any 3 phase loads, of course.

Faulty RCD is still a possibility.

I've found the official documentation on Schneider electric website, and to me, it looks correctly connected. I might try buying new RCDs and see if that helps.

 

[littlespark]

Clear as mud.

So the incomer is at top of rcd? Neutral is on leftmost terminal.

Double check your own connections…

 

[Startn]

Clear as mud.

So the incomer is at top of rcd? Neutral is on leftmost terminal.

Double check your own connections…

Yeah, triple-checked and everything.

I think when I first bought it I dropped it, so that might've been the thing that broke it. Haven't tried the other RCDs, going to try that later.

 

[littlespark]

looking for facepalm emoji

Yeah, dropping it won’t have done it any good.

Try a replacement first, and if it’s still faulty, you may need the services of a professional with the correct equipment to trace circuit faults

 

[Startn]

looking for facepalm emoji

Yeah, dropping it won’t have done it any good.

Try a replacement first, and if it’s still faulty, you may need the services of a professional with the correct equipment to trace circuit faults

I understand the fault bit needing a professional, and I take electricity very seriously.

I will update you on the RCD situation once it's swapped.

 

[Startn]

looking for facepalm emoji

Yeah, dropping it won’t have done it any good.

Try a replacement first, and if it’s still faulty, you may need the services of a professional with the correct equipment to trace circuit faults

I do have a question. Let's say I have a TN-C-S system, would that interfere with an RCD?

I don't know if it's a TN-S or TN-C-S system, but I've had this question for some time now. I will try to contact my power provider for more details.

 

[littlespark]

No… the earthing system doesn’t affect the rcd

 

[Startn]

looking for facepalm emoji

Yeah, dropping it won’t have done it any good.

Try a replacement first, and if it’s still faulty, you may need the services of a professional with the correct equipment to trace circuit faults

Ok, so turns out it was a faulty RCD.

I replaced it with three one-phase RCDs and it didn't work at first, but then I realized it needed to have separate outgoing neutrals, and now works just fine.

Thank you for pointers.