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I wouldn’t add an upfront rcd at all
Dp rcbos with main switch would be much better although not a requirement
The use of an upfront rcd should be avoided if possible.
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Please checkout the new poll we will be pushing hard, and want some good stories to come out of this
result are public - you can change your vote over time, which might genuinely be the case from time to time.
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Discuss After a New Consumer Unit, now I need EICR & 100A DP Isolation Switch in the UK Electrical Forum area at ElectriciansForums.net
Dp rcbos with main switch would be much better although not a requirement
The use of an upfront rcd should be avoided if possible.
And - just to throw a spanner in the works!
Regulation 411.5.2 (Just refreshing memory on TT systems) states;
One of the following i) RCD OR ii) Overcurrent Protective Device shall be used, with;
Note 1 "An appropriate overcurrent protective device device may be used for fault protection provided a suitably low value of Zs is permanently and reliably assured."
Now we know in the real world a 'permanently and reliably low value of Zs' is unlikely, but hyperthetically, installing a RCD is not necessarily a god given!
Regulation 411.5.2 (Just refreshing memory on TT systems) states;
One of the following i) RCD OR ii) Overcurrent Protective Device shall be used, with;
Note 1 "An appropriate overcurrent protective device device may be used for fault protection provided a suitably low value of Zs is permanently and reliably assured."
Now we know in the real world a 'permanently and reliably low value of Zs' is unlikely, but hyperthetically, installing a RCD is not necessarily a god given!
O
OLDBOY
Irrelevant.
All I have stated is that where an up front rcd is used sp rcbo's would not be compliant. I have not suggested any of the above is required, only the requirements where they are used.
O
OLDBOY
True, so what was your thinking posting something totally irrelevant?
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If something is REQUIRED then that would mean that you MUST use DP rcbos when using an up front rcd, but that's not the case as there are other options to having to use dp rcbos.
Meaning that it's not a requirement.
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O
OLDBOY
I have never stated dp rcbo's MUST be used where an upfront rcd is in service, if you read back through my posts I clearly agree other options are compliant such as a dual rcd board.
What I do state (very clearly I believe) and stand by is that wherre rcbo's ARE used......they must be dp where there is a upstream s type rcd and in that arrangement are effectively a requirement, you seem incapable of understanding that I am only refering to where rcbo's ARE used. I believe i have been quite clear that with other arrangements sp rcbo's are compliant.
Perhaps you would be good enough Mainline to answer this.
Lets say you have a job where the designer has specified DB's with rcbo protection to all final circuits. A main switch of s type rcd is also specified. Its a TT earthing system.
Would you install sp rcbo's and provide an EIC on completion?
Reply to After a New Consumer Unit, now I need EICR & 100A DP Isolation Switch in the UK Electrical Forum area at ElectriciansForums.net
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