DB installed connected & tested

[cliffed]

Just your thoughts on this DB,it’s a Lewden type,I personally don’t like them.
Bus bar,not ideal,main switch on right,space very tight to make connections,hate the rcbo’s,screws in front of each other,making it hard to retighten .

 

[Deleted member 26818]

5s for non TT.

 

[cliffed]

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.

 

[cliffed]

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.

Trouble is unless they are double pole rcbos then you have provided no discrimination.....

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,.

 

[cliffed]

Notsure if this uploaded,this came with the rcbo’s

 

[suffolkspark]

But N/E faults are mighty common? Meaning that one ANYWHERE on that install will cause the upfront to trip loosing the entire installation.

imo that doesnt comply with the regs so either DP rcbos or an alternative design should have been considered.

Also imo on TT with a full rcbo board the 100ma S is not required upfront so youd actually be better off swapping that mcb for an rcbo and the upfronter to a main switch...

 

[cliffed]

Ok,but then neutral to earth faults will not be disconnected at all,they will remain,unless DP rcbo’s are used.
The reasoning for the time delay is,discrimination for the lighting panel,which have its own rcbo’s.

 

[suffolkspark]

But there is no discrimination because it will trip on a N - E fault?

 

[cliffed]

A neutral fault on that circuit,will trip the individual rcbo’s on the lighting panel,before tripping the time delay Rcd.

 

[cliffed]

Something I’ve read:

 

[suffolkspark]

Are you an electrician?

 

[cliffed]

Probably

 

[Leesparkykent]

A neutral fault on that circuit,will trip the individual rcbo’s on the lighting panel,before tripping the time delay Rcd.

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.

Neutral-earth fault=loosing every circuit.

 

[Leesparkykent]

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,.

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

 

[rolyberkin]

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,.

I do, TT quite common around here so I use an SBS board.

 

[cliffed]

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.