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Schnider type AC RCD passing type A rcd test.

Alan B

Wonder what your thoughts are on this.

Installing an extra cooker connection point on an existing circuit. the circuit is protected by a 80A type AC rcd and 32A MCB.

It's going to be powering an oven plus an induction hob to be added, so should be on a type A RCD.

Problem is that Schneider only have  a 63A type A rcd for over £100 before vat.

But interestingly the type AC device tripped in 19mS  with a *1 type A rcd test.

So I am thinking maybe I don't need to worry about changing the RCD, what are your thoughts.

If I do change I will probably have to go for an RCBO

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  • I have an SRCD which I use as a sort of check box. On one occasion I had forgotten to set my MFT to type AC rather than A and the results were awry, albeit not by very much.  Both tests were "satisfactory", but I do not think that one can interpret a pass on type A as meaning that a type AC RCD serves a type A function. The MFT's tests are merely that.

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  • I have an SRCD which I use as a sort of check box. On one occasion I had forgotten to set my MFT to type AC rather than A and the results were awry, albeit not by very much.  Both tests were "satisfactory", but I do not think that one can interpret a pass on type A as meaning that a type AC RCD serves a type A function. The MFT's tests are merely that.

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