OK.. I have a faulty RCD to replace as seen on the photo. It feeds a 32amp ring circuit, in a commercial premises on a 'TT' supply. Ze=37.6, 0.63kA.
Looking at the photo you may notice a few strange things about the two RCD's?
Would I need to add in some extra form of protection before these isco's?![[ElectriciansForums.net] Does this need more protection?](https://electricians.s3.eu-west-1.amazonaws.com/data/attachments/60/60954-2d23cdd90927b1966f37be4b22900db6.jpg "[ElectriciansForums.net] Does this need more protection?")
Looking at the photo you may notice a few strange things about the two RCD's?
Would I need to add in some extra form of protection before these isco's?
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