Yes, quite eye-watering for now!
If concerned, I would probably look at 32A AFDD just on a couple of RFC for the sockets, rather like amendment 2 suggests (I think, not got it yet!), rather than all circuits.
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If concerned, I would probably look at 32A AFDD just on a couple of RFC for the sockets, rather like amendment 2 suggests (I think, not got it yet!), rather than all circuits.
That’s what I suggested. Stick to the sockets only and at a push the shower, cooker and planned EV charger as they’re quite high loads.
But they decided on just having an all up RCBO board given it saved them a good chunk of ££’s
If the supply fuse is too high for that (i.e. chosen for only fault protection and good selectivity) then you should make sure the sum of MCB/RCBO fed off the sub-main provides such an overall limit.
For a garage/workshop you might only be talking 6A circuit for lights (fixed load, probably 0.5A these LED days) and something like 20A-32A for socket outlets. So if the sub-main has a CCC of, say, 40A installed, then 2*20A radials or 32A RFC would not overload it, etc.
Indeed, and don't forget they are per circuit rather than one per consumer unit like SPDs.
To be fair, neither are MCBs.
Dave Savery did manage to build his own test rig. But as it’s supposed to be a manufacturing process test then there’s no requirement, currently, to test them on installation. Other than to check the self test has performed and indicates all is ok.
Still need to test the RCD function. But remember as per Amdt 2 it’s only the 1x test that is required now.
Discuss Any seen a RCBO like this before? in the UK Electrical Forum area at ElectriciansForums.net
If concerned, I would probably look at 32A AFDD just on a couple of RFC for the sockets, rather like amendment 2 suggests (I think, not got it yet!), rather than all circuits.
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Raptor0014
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That’s what I suggested. Stick to the sockets only and at a push the shower, cooker and planned EV charger as they’re quite high loads.
But they decided on just having an all up RCBO board given it saved them a good chunk of ££’s
Just to add that obviously the sub-main has to be overload protected as well.
If the supply fuse is too high for that (i.e. chosen for only fault protection and good selectivity) then you should make sure the sum of MCB/RCBO fed off the sub-main provides such an overall limit.
For a garage/workshop you might only be talking 6A circuit for lights (fixed load, probably 0.5A these LED days) and something like 20A-32A for socket outlets. So if the sub-main has a CCC of, say, 40A installed, then 2*20A radials or 32A RFC would not overload it, etc.
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It's likely that AFDD prices will start to reduce as more manufacturers introduce them to their ranges, but dramatic price reductions will likely only happen if they are mandated at some point in the future and production ramps up significantly.
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The problem with dual module RCBO's is the size of UK boards, soon run out of room on a decent size domestic installation, but agree that going back to fly leads is a retrograde step, how about the white earth lead as well. 
FYI In Europe the dual module RCD's and MCB's have the incoming across the top with off set terminals to allow horizontal bus bars, on the multi row boards there are vertical bus bars also available to power the RDC for each row, even for three phase.
Or if you want to use a non offset dual RCD/MCB combination there is this available: A9XPH224 | Schneider Electric Acti 9 2 Phase Busbar, 415V ac, 18mm Pitch | RS Components - https://uk.rs-online.com/web/p/busbars/7762724
FYI In Europe the dual module RCD's and MCB's have the incoming across the top with off set terminals to allow horizontal bus bars, on the multi row boards there are vertical bus bars also available to power the RDC for each row, even for three phase.
Or if you want to use a non offset dual RCD/MCB combination there is this available: A9XPH224 | Schneider Electric Acti 9 2 Phase Busbar, 415V ac, 18mm Pitch | RS Components - https://uk.rs-online.com/web/p/busbars/7762724
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Indeed, and don't forget they are per circuit rather than one per consumer unit like SPDs.
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And (to my knowledge) not testable for the arc-part on any MFT.
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To be fair, neither are MCBs.
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I was told recently at an Expo that as part of the certification process for AFDD they have to self test and will indicate if it fails.
Dave Savery did manage to build his own test rig. But as it’s supposed to be a manufacturing process test then there’s no requirement, currently, to test them on installation. Other than to check the self test has performed and indicates all is ok.
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So if they self test and indicate that all is OK should I sell my MFT?
Will this be the demise of the EICR and the electrician? 
Will this be the demise of the EICR and the electrician?
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Raptor0014
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It’s only the AFDD part that’s the self test.So if they self test and indicate that all is OK should I sell my MFT?
Still need to test the RCD function. But remember as per Amdt 2 it’s only the 1x test that is required now.
Reply to Any seen a RCBO like this before? in the UK Electrical Forum area at ElectriciansForums.net
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