Discuss Do MFTs that test Type A/AC also test type F, type S, and Type G RCDs in the Electrical Forum area at ElectriciansForums.net

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The type S and G referred to on your tester will be for Selective or General types, ie time delayed or not.

This is different and additional to the current characteristics of RCD type such as AC, A, F, and B.

Looking online quickly I think your tester is capable of testing type AC and A.
 
The type S and G referred to on your tester will be for Selective or General types, ie time delayed or not.

This is different and additional to the current characteristics of RCD type such as AC, A, F, and B.

Looking online quickly I think your tester is capable of testing type AC and A.



Thanks for your message Andy, so does that mean I can test Type F, and Type S RCDs? I'm aware I'd need a higher range rcd testing mft to test Type b.

Also, I tried to open the rcd resource you uploaded but it says I'm not allowed to download
 
Thanks for your message Andy, so does that mean I can test Type F, and Type S RCDs? I'm aware I'd need a higher range rcd testing mft to test Type b.

Also, I tried to open the rcd resource you uploaded but it says I'm not allowed to download

No idea about my resource I'm afraid, but the link by pc1966 works.

I think it's vital you look at the differences between RCD types as you seem to be mixing them up a bit.

Your tester will test type AC and A, but I don't think it will test type B or F.
It will likely test both AC and A in either general or selective setting.
 
That is an interesting point: is testing on a AC/A waveform sufficient for a B or F RCD?

I would argue that it is, as you are not characterising the RCD as you might in a development lab, but simply verifying that it is detecting current at the appropriate level, and then disconnecting in the acceptable time-scale.

While I guess there might just be some corner-case fault that would removed DC/HF detection and leave AC trip OK, or you might have a knock-off module that fakes its B/F rating and really is an AC RCD inside, but I guess those are probably very rare situations to worry about.
 

Reply to Do MFTs that test Type A/AC also test type F, type S, and Type G RCDs in the Electrical Forum area at ElectriciansForums.net

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