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A 100mA RCD fitted up stream of a 30mA RCD might still trip for before the 30mA, it depends on the individual components. The only way to RCD cascade a distribution circuit is to use a 100mA time delayed RCD, which will not count as additional protection (415), nor would a normal 100mA for that matter
 
bs7671 talks about rewireable fuses so if the customer can have the job done with in the regs for the price they want so happy with the cost. its like some people want the work and some see it as a problem and would like to live in the perfect world
 
100% right

i wont work on old rewireable fuseboards now. if they need work done they should upgrade, otherwise it wouldn't pass any test/inspection regardless of the work done.
what complete twaddle this is...lol.....as long as the enclosure is still sound...and the fuses are of the correct rating+disconnection times have been met...then whats up with fuses to BS3036?....if you need additional protection by means of RCD for the work YOU carry out....then do so.....but that doesn`t mean you condemn a perfectly servicable piece of equipment on a whim.....this goes for PIRs/EICRs n all....
 
A 100mA RCD fitted up stream of a 30mA RCD might still trip for before the 30mA, it depends on the individual components. The only way to RCD cascade a distribution circuit is to use a 100mA time delayed RCD, which will not count as additional protection (415), nor would a normal 100mA for that matter
yes Bob but Leigh n I have come across several scenarios where 100mA RCDs have been used as an attempt at acheaving discrimination.....it all depends on the actual tripping current of the individual device and the amount of earth leakage its being subjected to.....
 
Balderdash, didn't see it was an old thread, I'm outta here...
 
I agree It would be good practice to first measure the total earth leakage and determine weather or not this RCD would be subject to nuisance tripping caused by the sum of appliances on original finals.. Although, I would have thought 100mA would be most cases (average domestic), provide adequate scope.
And no, it wouldn't provide addition protection to the original circuits, but we would achieve a source to add the Garage Unit.. My concern is in adding this RCD in front of the original Fuse board would we now be liable for the whole installation or would this job be classed as an additional circuit?
 
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