Diversity

[binky]

Only just starting to come in. Was at the last Napit event. Its to avoid circuits that are high use high current (ev) overheating theirs and neighbouring mcbs/rcbos. As ev chargers are high load over a long period.

Hence why Lewden now have a 39 way board

Sounds like more nonsense from NAPIT to me, night storage heater boards have been working fine for decades. Never done this in commercial / industrial 3 phase boards either. All MCBs are supposed to be rated for their max ampage in continuous use, so if there's an issue, they should be shaming/ naming ***** MCB manufacturers.

 

[Andy™]

All MCBs are supposed to be rated for their max ampage in continuous use, so if there's an issue, they should be shaming/ naming ***** MCB manufacturers.

just stick them inside a non combustible enclosure, they'll be fine, the fire will never escape from there

 

[mort2376]

It's all to do with rated diversity factors for mains boards.

That's the slide from the Napit expo.

Also a link to the IET on the subject.

https://electrical.theiet.org/wirin...nsumer-unit-due-to-mutual-thermal-influences/

 

[binky]

It's all to do with rated diversity factors for mains boards.

That's the slide from the Napit expo.

Also a link to the IET on the subject.

https://electrical.theiet.org/wirin...nsumer-unit-due-to-mutual-thermal-influences/
View attachment 15969

That's new. I suppose they have to keep busy

 

[mort2376]

I think it's a reaction to the government's let's go all electric idea, and the realisation that it's gonna cause massive issues.

Plus it's a European EN thing as well.

 

[kerching]

In my bigoted, and seldom wrong , opinion you should refer the NAPIT bod to the High Court case of Arkell v. Pressdram

 

[sirsparkabit]

Cripes !! I just had a flick through that article , got to the bit about a 32 amp charger mcb ending up needing to be a 63 amp with cable sized to match that due to derating factor for mcbs grouped together . FFS just put it in its own enclosure where possible and avoid oversized boards ,or should builders supply a plant room .
I for one think the excessive use of the planets mineral resources, I.e copper for 1 example shouldn't mean fitting larger and larger cables .
As to the ops predicament with Napit it seems absurd and I agree he should demand another opinion and free re-assesment .
I think I will have a problem this year as on a minor works customer didn't want a A type rcd installed in his old board as he had a previous eicr recommending he has a board change which he said he is soon . I marked my cert accordingly ,Job was to install a single socket on existing ring final circuit , now I expect doing that may cost me at assesment , I don't think for this sort of job we should be changing existing rcd ac type it's ludicrous ! ps also a third floor apartment so no chance of socket being used outside .
rant over

 

[kerching]

AFAIK in existing installations Type A are now required IF there are a lot of electronic loads OR There MAYBE in the future. Not my circus not my monkeys! How do I know what they may or may not plug in!
Does her Black Mamba throbber deluxe 300 produce a dc backfeed??

 

[sirsparkabit]

 

[Murdoch]

Spotted this today. Presumably the installer can’t add up

Locked to prevent being resurrected (again)