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Burnmenot

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I’ve been looking for the right answer and just can’t seem to find it.
I had an induction hob installed by a certified electrician, and there are no apparent problems so far, however, it is installed on the CU, RCD and upstream with a RCCB with no MCB,
I’m just not 100% sure if it’s the safest way to install it, I would personally think that would be safer on an RCBO or on a MCB, I’m not worried about overloading as it’s on a 10mm2 cable, 40a RCCB and the unit draws a max of 25Amp, I worry more about the fact that the RCCB will not protect on short circuit.
I appreciate any feedback or comments.
Thanks
 

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loz2754 said:
Can't be certain but it appears the RCCB is fed from the top left 32 amp MCB.
That board is a bit of mess to say the least.
Click to expand...
Thanks for the comment, yes not state of the art.. it’s a 20 years old CU. The RCCB is feed from the busbar from the RCD as all the other MCBs on the busbar, I think there is no problem there. Question is about the RCCB being safe or not without an MCB.
Thanks
 
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Burnmenot said:
Thanks for the comment, yes not state of the art.. it’s a 20 years old CU. The RCCB is feed from the busbar from the RCD as all the other MCBs on the busbar, I think there is no problem there. Question is about the RCCB being safe or not without an MCB.
Thanks
Click to expand...
In that case, the circuit fed from the RCCB has no overcurrent protection.
 
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DPG said:
OP, what made you look at how the electrician had wired the cooker into the consumer unit?

Did you get an installation cert?

And yes, fundamentally every circuit needs over current protection of some sort.
Click to expand...
my interest and curiosity for electricity and the safety of my home and family, do that suffice?
no cert provided..... cowboy, I called many snags on the electrician alone... I'll spare you the details, just to say the cover for the connection under the hob was found on a drawer... then I saw the wires exposed...
 
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Thank you all for your comments, very much appreciate that you took your time to give your opinion on what seems to be a hot mess of a CU, I kind of knew that, the whole house was built on a weekend during the boom in Ireland so no surprise there. I just want to focus on having the correct protection, for now, aesthetics is not my main concern right now.
What I take from all your comments is that the RCCB where the Induction hob is should be an RCBO, and that the current RCCB does not provide enough protection to the hob or the circuit and it could be an electrical hazard?
 
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On the face of what is presented above I would say the OCP is not achieved with the installation method used. What might be the consequences of this? In terms of overload it is not a problem as it is a fixed resistive load and can only achieve a fixed amount of load. In the event of a short circuit where the load may well exceed the CCC of the cable due to the fault current exceeding by many multiples the CCC of the cable. Therefore the cable may melt/explode causing danger of fire. It would then be prudent and indeed required to arrange the appropriate protection for the cable. Ensuring the operative engaged is properly qualified to undertake such work. The chance of a short circuit while being quite remote is nevertheless important to have remedied.
 
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Vortigern said:
On the face of what is presented above I would say the OCP is not achieved with the installation method used. What might be the consequences of this? In terms of overload it is not a problem as it is a fixed resistive load and can only achieve a fixed amount of load. In the event of a short circuit where the load may well exceed the CCC of the cable due to the fault current exceeding by many multiples the CCC of the cable. Therefore the cable may melt/explode causing danger of fire. It would then be prudent and indeed required to arrange the appropriate protection for the cable. Ensuring the operative engaged is properly qualified to undertake such work. The chance of a short circuit while being quite remote is nevertheless important to have remedied.
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thank you very much for your comments and advice, much appreciated.
I've decided to keep the RCCB turned off while not in use just in case.
I will make sure a reputable certified electrician does the job... possibly replacing the whole CU and new more modern type B breakers with 6ka capacity class3, instead of 3ka, although here in Ireland that it's extremely hard! not to say almost an impossible quest!
 
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Burnmenot said:
Thank you, I'll consider that, in the main time if my electrician suggests adding an MCB to the RCCB instead of replacing it with an RCBO, where should the electrician position the MCB, before the RCCB or after connected to the load?
thanks
Click to expand...
Ideally between the RCD and the load - as is the case with the lower Hager RCD. That way the MCB protects the RCD against the effects of a short circuit (Though in this case with one load it may not make much practical difference.)

In either case it should really be a short term solution until you can get the whole installation looked at. Some of the Hager stuff looks in good condition and is still 'current' so it may be possible to reuse them, perhaps in a new enclosure depending on the state of the existing one, add some Hager Type A RCBOs on relevant circuits and end up with a much better installation without massive time or cost involved.
 
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