To all the Part P and electrical experts in this group, can someone kindly clarify where in 17th edition it states that a RCD board is required for kitchen circuit (I am aware that this is a special location) to upgrade a perfectly working 16th edition board (no RCD but individual MCB).

I just need clarification that this is deemed necesarry and the cost of an extra £375 is required. The current earth bonding on this TNS supply is sufficient and the earth loop readings are within requirements.

Sorry to ask a basic question to you experts!

Ben

Are you the customer who has been presented with the quote or the elctrician carying out the install?

There is no requirement to change the distribution board if you are installing a new domestic final circuit, there are however various requirements to provide mechanical protection, or rcd protection to the installed wiring and also socket outlets. (411.3.3)(522.6.101)(522.6.102)
Edit,
BS 7671, does not define a kitchen as a special location.

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A close relative is the customer (pensioners) and the electrican has quoted to remove the existing ring main (which is fine!) and install new 'stating that RCD is required for both lighting and power new circuits - hence new 17th edition board!'

They also stated that the main earth bond (current 10mm) on TNS needed replacing to 16mm at over £150!

I may not be a electrician but I could scream at times!

They will need to provide RCD protection to the new "ring" a nd possibly to the lighting (dsepending onthe cable type/install.

The bonding is fine at 10mm2


If the current DB is pretty new, I'll bet you can get an RCBO to replace the MCB that feeds the old ring

Someones having a Giraffe

Regards

OMS

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Failure is always an option

RCD's would not required to an existing circuit unless it is altered or replaced; but would be an expected recommendation item for an electrical installation condition report

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Thank you for the expert advice....you know deep down it is not right but at times support is required.

I started to question the quote when they proposed to hid all the white good isolators in cupboards, which I questioned how a pensioners would (a) be able to isolate and (b) know where the switches are and what they do!

Is this a kitchen refit?

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It should not to be construed as implying that existing installations shall be retrospectively made to comply with the latest regulations. As long as existing installations continue to give satisfactory service they do not need to be brought up to current standards until major repairs/refurbishment is planned, and for most people today when it is prudent to do so.

regards

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"Take nothing but a picture,
leave nothing but footprints!"
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"Oh! The drama of it all."
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"You can throw all the philosophy you like at the problem, but at the end of the day it's just basic electrical theory!"
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Nice one RnR, a perfect Sir Humphrey.

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I know I am a bit thick but what does that actually mean?

Nick

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"be careful of what you write"

yes - unfortunately, but they are Part P and NICEIC etc or so called experts!

As for the 'main earth bond' there could be some misunderstanding of correct terminology here, could this be the Earthing Conductor that needs upgrading to 16mm, rather than the Main Protective Bonding Conductors?
Though £150 does seem rather excessive, what is that, a days work to fit 20 m of single core?
I'd like to earn that, but, without knowing what is actually being quoted for, we cannot really give a definitive view - upgrade of a tortuous run to gas, and another tortuous route to the water, then I could see £150.
Kitchen - appliances all moved, so need new FCU, then using an old MK board which is difficult to get breakers for, then a new CU may be the best option.
However, if a recent board, with a readily available RCBO, then it could be an easy job.
Who knows without more, accurate , details.
Alan.

If you don't f**k about with it, it'll be fine and all this 17th edition RCD malarkey isn't required - in a nutshell.

I couldn't possibly say that though -

Regards

OMS

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Failure is always an option

Doesn't matter if it is the earthing conductor, 10mm² is all that is required, unless the live conductors are 35mm² or greater.

Being part P registered does not make them experts, only approved to self certify their own work.
Does the furniture refit require relocaton of, or additional outlets; perhaps some level of specification is needed, rather than a free for all for the installer.

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As I said, perfect Sir Humphrey. He has said a lot, but it means nothing more than was previously stated. A recommendation is just that, you don't have to take action, just consider the facts.

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--"does not matter if it is an earth lead, 10mm is ok"
incorrect, min size earth lead for PME is 16mm

Regards.

UKPN: in the OP's second post he states it's TN-S....

UKPN=Dave Cockburn
Regards.

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Those who make no mistakes do very little work!!......