Discuss Type A RCDs Vs Type AC in the Electrical Forum area at ElectriciansForums.net

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Hager used to stipulate no sp RCBOs for tt systems and now it’s all ok..
Why?
Because it suits what they are selling

Or maybe they have changed the design of their RCBO's to be suitable for use on a TT system.

I don't fit Hager so I don't know, do they have functional earth's for their RCBO's or are they the type without?
 
The new compact rcbo has no functional earth.
 
For years I have used dp RCBOs on tt systems - MG or Hager and will carry on doing so..
Seems strange that the regs are ok with not disconnecting the neutral on a tt system even though it’s not tied to earth.
 
If we need double pole protection in TT installations, then fuses can’t be used.
So we have to condemn all those BS 3036 and BS1361 fuse boxes.
What about the DNO fuse, or plug top fuses?

Wait, what about single pole light switches?
 
If we need double pole protection in TT installations, then fuses can’t be used.
So we have to condemn all those BS 3036 and BS1361 fuse boxes.
What about the DNO fuse, or plug top fuses?

Wait, what about single pole light switches?
What does any of that have to do with circuits protected by RCDs ?
 
Hager will move the goal posts to suit themselves..
Before metal boards it was stipulated by the manufacturer that RCBOs must not be used on TT systems and now it’s suddenly all ok..
When Hager done their Amd3 roadshow I quizzed them on quite a few things but he couldn’t break out of script, kept repeating the same nonsense.
Even the regs are guilty of it, would appear they are in cahoots with each other.
Not sure I agree with a lot of that comment.

I really don’t see the issue with A typeRCBO’s. I’ve probably fitted at least 100 and all have tested out fine.
 
Had some unusual things when testing the last 2 type A RCBOs I stuck in, set test meter to type A RCD, and both tripped at 1/2 IΔn, replaced them with new ones from a different place and still the same. The readings were the same with outgoing conductors connected and disconnected. Testing them with the meter set to type AC RCD gave normal results. I have previously tested quite a few type A RCBOs without issue. Perhaps meter is faulty. :(
 
Getting the Same as you @freddo on the last two Split load Hager Boards fitted...Both have tripped at 1/2 on all RCD's and giving me well over 40ms (X5) on the last board. I'm using a Kewtech Tester (KT64DL) which I've had no problems with before? Spoke to both Kewtech and Hager about this and both party's seem blame each other?!?
 
@freddo Well Kewtech Tech told me they were trying to get info out of Hager in regards to what mA @ X5 is needed if its between 150mA - 250mA the Kewtech cant do it at the standard setting and Kewtech units are not Variable (unlike the meggers are)?! So was told to carry out X5 @ 100mA??!!?? Which could possibly damage the RCD?! So not sure what the point of that is as this would be putting 500mA through the device? But also reading up people have suggested carrying out 1/2 @ 500mA (Giving you 250mA) which I believe Hager are saying is the recommend value needed for there Type A Devices. (CD285U)
 

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