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on the 'old' system, which we have currently, you have a breaker on each circuit (which protects against too much current being drawn). The two RCDs are then protecting half of the circuits each, so if there is a fault where more current goes out than back in on any of those circuits the RCD trips. Normally you get it laid out something like this in the consumer unit: RCD..[a set of breakers] RCD [a set of breakers]
This means if the RCD trips all the circuits connected off it wont work. The 'new' style is to have the RCD and breaker combined for each circuit (RCBO) so only one circuit trips for a fault.
It's not absolutely necessary to pass an EICR, you can just upgrade the two RCDs (if there's space in the consumer unit) if they're not the type that is now required.
jdsnape-
Ah, I wrongly assumed the RCDs were only for the circuit they were on, not like a whole bank.
I mean, given how much luck I've had with the wiring in this place it wouldn't surprise me if either or both were true.
Oh look, I found a pic. Looks like we already have an RCBO for something.
I think that's what he was suggesting - there's some blank panels so I reckon he was going to try and get it up to spec as well as he could without having to get a whole new consumer unit.
ie. move the two circuits in the older brown box to the existing CU
hippy
But don't you have an RCD per circuit? Because we only have RCDs on two and the rest are without (I think)