Discuss DB installed connected & tested in the UK Electrical Forum area at ElectriciansForums.net
For the money they are spot on ......................
most boards have MS on the right. only one i've seen with it on the left is MK.
It’s a 100 ma time delayWhy is the up front RCD not time delayed?
Yea it’s a tt systemAgree with torque settings for screws.
Also I hate the main switch isolator on the right, much prefer left.
Anyone know why some boards have the main switch on the right?
Is it a TT system?
Just curious.
Yes that was exactly my point. Neutral earth fault and the RCBO will trip but the upfront RCD, time delayed or not will still trip as the RCBO's don't break the neutral.@Leesparkykent its a time delayed one so "should" be ok, you can just see the S on the front of it.... The rcbos are only single pole though so there still isnt perfect discrimination and a fault remaining on the neutral will trip the whole supply... Not a great setup imo...
Agree,could be a problem there@Leesparkykent its a time delayed one so "should" be ok, you can just see the S on the front of it.... The rcbos are only single pole though so there still isnt perfect discrimination and a fault remaining on the neutral will trip the whole supply... Not a great setup imo...
Do you have the pozi-flat hybrid type driver in your torque set? I do and have never had an issue with the Lewden RCBOsMy issue with the Lewden boards is the advised torque settings, I have two torque drivers and with either if I torque them to manufacturers settings it has a tendency to damage the rcbo screws.
How is fault protection provided for the 63A circuit ?
I thought it was time delayed ? How will this meet disconnection times ?By the upfront rcd....
Hi - TT disconnection times for a distribution circuit is up to 1 second from Reg 411.3.2.4I thought it was time delayed ? How will this meet disconnection times ?
Bear with me as I have nothing to do with TT systems and probably lack a lot of knowledge in this area.
Cheers for that. Thought I would be missing something. Didn't think the higher times applied to TT.Hi - TT disconnection times for a distribution circuit is up to 1 second from Reg 411.3.2.4
yea,your talking about the N/E faults that may happen,discrimination will occur when there’s a L/E fault.Trouble is unless they are double pole rcbos then you have provided no discrimination.....
yes but as Suffolk spark has said it will still trip the upfront RCD so there is no discrimination in the event of a neutral earth fault.A neutral fault on that circuit,will trip the individual rcbo’s on the lighting panel,before tripping the time delay Rcd.
This came with the rcb’os,providing a upfront Rcd is used,it’s ok-ish,I realise discriminating may not be ideal,but what else can you do,on a TT system.
yea,your talking about the N/E faults that may happen,discrimination will occur when there’s a L/E fault.
Who on earth uses double pole rcbo’s,.
This came with the rcb’os,providing a upfront Rcd is used,it’s ok-ish,I realise discriminating may not be ideal,but what else can you do,on a TT system.
yea,your talking about the N/E faults that may happen,discrimination will occur when there’s a L/E fault.
Who on earth uses double pole rcbo’s,.
Agree.Not double pole but switched neutral. These would of done the job.
Wylex NHXS1B32 32 Amp 30ma Type B 1 Module RCBO - Edwardes - https://www.edwardes.co.uk/en/products/wylex-nhxs1b32-32-amp-30ma-type-b-single-pole-1-module-rcbo-?utm_medium=google_shopping&utm_source=google&utm_campaign=google_shopping&gclid=EAIaIQobChMIxemvxrWc2wIVypPtCh23egO4EAQYASABEgLWBfD_BwE
You are literally talking milli seconds before the upfront RCD trips aswell as the RCBO. what's the installation method of the distribution circuit feeding the loxone?Ok,if the fault happens on the 30ma protected circuits,theses would trip before the time delay Rcd.
That’s why the time delay Rcd is installed.
It’s no-different set up than the above literature supplied by the manufacturers.
I can see your points about the N/E scenario,thinking that would be the worst case.
When this set up was introduced years ago,it worked well,preventing complete disconnection, of power.
Yeah but even when the downstream RCBO trips the N-E fault will still remain and therefore will trip the main RCD after the time delay because the RCBO will only disconnect the line of the CCT the neutral and earth are still in the bars and the fault will be seen by the RCD main switch. IMHO the best way to sort it and achieve discrimination is to change the MCB to an RCBO and have an upfront isolator rather than a main switch.Ok,if the fault happens on the 30ma protected circuits,theses would trip before the time delay Rcd.
That’s why the time delay Rcd is installed.
It’s no-different set up than the above literature supplied by the manufacturers.
I can see your points about the N/E scenario,thinking that would be the worst case.
When this set up was introduced years ago,it worked well,preventing complete disconnection, of power.
Agree.Not double pole but switched neutral. These would of done the job.
Wylex NHXS1B32 32 Amp 30ma Type B 1 Module RCBO - Edwardes - https://www.edwardes.co.uk/en/products/wylex-nhxs1b32-32-amp-30ma-type-b-single-pole-1-module-rcbo-?utm_medium=google_shopping&utm_source=google&utm_campaign=google_shopping&gclid=EAIaIQobChMIxemvxrWc2wIVypPtCh23egO4EAQYASABEgLWBfD_BwE
Yea I can see where everyone is coming from,we are talking about a n/e fault here,I know it’s on aTT system,but realisticallyYeah but even when the downstream RCBO trips the N-E fault will still remain and therefore will trip the main RCD after the time delay because the RCBO will only disconnect the line of the CCT the neutral and earth are still in the bars and the fault will be seen by the RCD main switch. IMHO the best way to sort it and achieve discrimination is to change the MCB to an RCBO and have an upfront isolator rather than a main switch.
Reply to DB installed connected & tested in the UK Electrical Forum area at ElectriciansForums.net
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