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Old 27.02.2017, 16:18
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Electrics - fuse + RCD = ok?

Hoping for some quick advice on legality / standards compliance.

In our electrical distribution unit we have the three-phase circuits wired with both a round screw-in fuse (the cartridge type) and a corresponding RCD/electronic switch for each.

Which makes sense to me - fuse gives long-term protection against over current, electronic gives quick protection from short circuit etc.

Also means you can turn off the circuit if changing the fuse cartridge.

Is this legal? I've just had a suggestion it isn't, but I think they only noticed the fuses and not the RCD as well.

Thanks.
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Old 27.02.2017, 16:59
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Re: Electrics - fuse + RCD = ok?

A fuse is a fuse and an RCD is an RCD. Both have different functions.
A fuse protects the wires. An RCD protects you.
A fuse is triggered by too much current something like 13 Ampere. An RCD when Current_In - Current_out > Current_RCD, where Current_In and Current_Out is something between 0 and upto Current_Fuse and Current_RCD is around 20 mA.
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Old 27.02.2017, 17:04
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Re: Electrics - fuse + RCD = ok?

Thanks - I know all that, which is why the combination makes sense to me, to cover all failure modes.

But we were told by the kitchen lady that it would need to be replaced due to regulations - my suspicion is that she just saw the fuses and not the RCD units; unless there's some sort of regulation regarding new fuse form or something.
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Old 27.02.2017, 17:14
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Re: Electrics - fuse + RCD = ok?

The kitchen lady?

If you set an new outlet in an area where the actual rules say that the outlet must be RCD secured, than the outlet must be RCD secured.
YOu can either to this socket side, or better do it better near the fuses.
http://www.esti.admin.ch/files/estim...lerstrom_D.pdf

I am not a sparky, but I think that DIAZED fuses plus an RCD next to it are perfectly o.k.
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Old 27.02.2017, 17:35
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Re: Electrics - fuse + RCD = ok?

Exactly - to be fair she did say she'd have to check... and I suppose she was just letting us know, rather than giving us a quote and then saying later it would be an extra couple of grand.

But I was wrong on the setup - I need to check further, but it looks like:

* fuse for each phase for each appliance circuit (three circuits = nine fuses)

* ECB (not RCD) for each phase, before the fuses (so three ECB) - marked GWA which I guess is "gesamt" something

* all of the above are rated at 10A

Max 10A per appliance-phase, and max 10A per phase total - across three appliances (oven, hob, washing machine)... seems very odd to have the 10A total limit across three separate circuits, I would have expected 30A.

Not sure yet if all this goes through the main three-phase RCD as well...

Will have a proper look inside and see how it's really wired up before I guess again

ps - thanks for the link - technical translation isn't my strong point, or Google's, but it seems to be happy with one four pole (i.e. three phase) RCD in the main fusebox?
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