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RCD selection and BS7671:2018+Amendment 2:2022

sparkiemike


My question relates to the latest regulations (BS7671:2018+Amendment 2:2022) and RCD selection.

I have an existing installation with an upfront 30mA type-AC RCD.

I am quoting for some work where there will be some electrical alterations for a new kitchen. No new circuits! Mainly some new sockets and LED lighting and relocating a cooker cable. So DC components will be introduced.

Is there a requirement to upgrade the RCD to a type-A RCD to comply with 531.3.3?

Are others anticipating fitting type-A rcds on their minor works now e.g. 4 new downlights in bathroom?

The current board is obsolete so either I put a different manufactures kit in to the board or a new consumer unit. Understandably the customer is reluctant to spend any more money

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    As you cannot just replace the existing RCD because the consumer unit is oboslete, you cannot replace it although it would potentially be preferable to do so.

    That completely replacing the consumer unit or adding an additional consumer unit as the only ways of installing a Type A.

    A comment in the quote advising updating the existing installation by replacing the consumer unit is one option, quoting for a separate consumer unit is another, either way you may not get the job because of the additional cost.  

    That leaves a carefully worded guidance to upgrade, unless you think it will be dangerous.

    However I have been to jobs exactly like this where the new hob was tripping the old Type AC RCD and had to be replaced with a Type A anyway.

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    As you cannot just replace the existing RCD because the consumer unit is oboslete, you cannot replace it although it would potentially be preferable to do so.

    That completely replacing the consumer unit or adding an additional consumer unit as the only ways of installing a Type A.

    A comment in the quote advising updating the existing installation by replacing the consumer unit is one option, quoting for a separate consumer unit is another, either way you may not get the job because of the additional cost.  

    That leaves a carefully worded guidance to upgrade, unless you think it will be dangerous.

    However I have been to jobs exactly like this where the new hob was tripping the old Type AC RCD and had to be replaced with a Type A anyway.

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