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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The current board is obsolete so either I put a different manufactures kit in to the board or a new consumer unit.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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    Well that's a good question. For TN systems, In a domestic setting (or commercial for that matter) Surely the only time that you would consider changing an existing type A/C RCD is if there is likely to be high DC currents..................

    At what point - what number of fittings - do Downlights in a house or (600 x600) LED Flat panels in a commercial environment for example,start blinding an AC type RCD? 

    Will 1 x dishwasher or dryer with a variable speed drive in it blind a type AC RCD?

    I remain unconvinced of the imminent disaster of in use AC Type RCDs, assuming that the circuit is designed properly anyway (without the additional protection of an RCD) for a disconnection time of <0.4 seconds for a final circuit anyway. 

    In a TT System, where the RCD is the primary protection, I'd certainly change the AC type RCD as standard. 

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  • 0

    Well that's a good question. For TN systems, In a domestic setting (or commercial for that matter) Surely the only time that you would consider changing an existing type A/C RCD is if there is likely to be high DC currents..................

    At what point - what number of fittings - do Downlights in a house or (600 x600) LED Flat panels in a commercial environment for example,start blinding an AC type RCD? 

    Will 1 x dishwasher or dryer with a variable speed drive in it blind a type AC RCD?

    I remain unconvinced of the imminent disaster of in use AC Type RCDs, assuming that the circuit is designed properly anyway (without the additional protection of an RCD) for a disconnection time of <0.4 seconds for a final circuit anyway. 

    In a TT System, where the RCD is the primary protection, I'd certainly change the AC type RCD as standard. 

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