How’s this gonna work...overloading

[cliffed]

Just wondering how you guys think about this.
It’s a minefield.

 

[Leesparkykent]

Just wondering how you guys think about this.
It’s a minefield.

View attachment 44568

I can’t read it as blurry but what is different than before when it comes to overload?

 

[cliffed]

Re loaded pic.
My reading of it suggests the main switch needs to be adequately rated to supply circuits of the DB,the total of these circuits should not be more than the rated main switch.

 

[Leesparkykent]

Re loaded pic.
My reading of it suggests the main switch needs to be adequately rated to supply circuits of the DB,the total of these circuits should not be more than the rated main switch.

Isn’t that what you do now though, taking diversity into account?

 

[cliffed]

Yes,but 18th does not allow for diversity,on this DB install.

 

[cliffed]

Marked up

 

[Wilko]

Here's the link if needed -
Overload Protection: Hager Explains What You Need To Know - Electrical Contracting News (ECN) - http://electricalcontractingnews.co.uk/news/overload-protection-what-you-need-to-know/

 

[Wilko]

My quick read is that most split units supplied by manufacturers today would not comply ... I've been installing dangerous equipment again (sarcasm alert).

 

[cliffed]

My quick read is that most split units supplied by manufacturers today would not comply ... I've been installing dangerous equipment again (sarcasm alert).

Yea & me...how is it gonna work,say a 3 phase DB @ 125 amp main switch,4 x 32 amps 128 amps..still got lights cooker,shower,radials & more ring mains...oh dear.

 

[The Ghost]

So that effectively means the OCPD devices are not fit for the purpose, sounds like getting a guard dog and barking for it.

 

[Nigel]

Yea & me...how is it gonna work,say a 3 phase DB @ 125 amp main switch,4 x 32 amps 128 amps..still got lights cooker,shower,radials & more ring mains...oh dear.

I would not have installed a 125A main switch on anything over a 100A supply anyway.

 

[cliffed]

125 amp main switch specificed on 100 amp supply.

 

[D Skelton]

There's no significant change, this article is merely someone at Hager trying to justify their salary.

 

[Nigel]

125 amp main switch specificed on 100 amp supply.

Eh?

 

[Wilko]

There's no significant change, this article is merely someone at Hager trying to justify their salary.

I did wonder why they'd not stated the reg so we could look it up ...

 

[Baddegg]

Just fit populated rcbo boards,would that work?

 

[cliffed]

Scaremongering.

 

[cliffed]

I did wonder why they'd not stated the reg so we could look it up ...

Good point,ain’t got new reg book yet,anything in that relating to what Hager is saying?

 

[Wilko]

Just fit populated rcbo boards,would that work?

My take is yes, that's fine. They don't like the RCD with say 80A rating sitting between the suppliers 100A fuse and a row of MCB that add up to more than 80A. They are saying (don't know if true) that we are no longer allowed to use diversity as per OSG.

 

[cliffed]

Exactly