Using Type D MCB for discrimination

[Michaelwgroves]

But if this is protection from the DNO fuse to the CU what do you do if the DNO fuse is 60A

DNO fuse 100A

 

[buzzlightyear]

DNO fuse 100A

or 6in nail !

 

[Rocboni]

Fuse holder module??

You only get standard size fuseholders up to 32A any bigger and its a double module, so the busbar won't fit.

What not individual switch fuses?

 

[Michaelwgroves]

Fuse holder module??

Interesting, got any links I can look at?

 

[buzzlightyear]

What not individual switch fuses?

did tell him pike !

 

[Michaelwgroves]

You only get standard size fuseholders up to 32A any bigger and its a wider module, so the busbar won't fit.

What not individual switch fuses?

I'd need 5, Distribution panel seems like a better solution.

 

[buzzlightyear]

Ryefield Board | Ryefield Distribution Board | Sparks Direct - https://www.sparksdirect.co.uk/electrical-items/consumer-units/industrial-and-commercial/ryefield-boards

 

[Michaelwgroves]

Ian1981, thanks for attachments, not sure how to read. Say I have 63A Type D upstream and 20A Type B downstream. I think I have my up's and downs the right way!
I use first page which gives me 0.84 kA, so what does this tell me?

 

[Rocboni]

I'd need 5, Distribution panel seems like a better solution.

Maybe get a 10 way board fit 5 bs88 carriers p, not sure what you'd do about the busbar, unless you snip off energy second way ,

I'd be going with switch fuses though with separate meters on each if needed.

 

[Michaelwgroves]

Ryefield Board | Ryefield Distribution Board | Sparks Direct - https://www.sparksdirect.co.uk/electrical-items/consumer-units/industrial-and-commercial/ryefield-boards

I agree achieves discrimination, but it's 5 times the cost and not amendment 3 compliant, so I'd need to buy a bigger metal box to put it in

 

[Michaelwgroves]

Technical Properties LS201 - http://www.hager.co.uk/product-catalogue/energy-distribution/protection-devices/fuse-carriers/hrc-fuse-carriers-bs88/ls201/47120.htm

This looks perfect but only goes up to 32A like Rocbino said preciously. If they did same thing with 60A it would be perfect

 

[Rocboni]

PMX22 - 1P | Charter Controls - https://charter-controls.com/products/fuses-fuse-holders/pmx22-1p/

Don't think a busbar will fit though and might be right with 5 10mm SWA into the top of the CU?

Personally for me 5 switch fuses, some steel trunking and a 6 way Henley block, Then your SWA to each room.

http://www.lamps2udirect.com/electrical-accessories/eterna-cb100dp-double-pole-100a-connector-block/70396 about £300 total

 

[Rocboni]

Are they 10mm or bigger?

 

[Leesparkykent]

I agree achieves discrimination, but it's 5 times the cost and not amendment 3 compliant, so I'd need to buy a bigger metal box to put it in

Look at Eaton Excel distribution fuse board.

Edit: link Exel distribution fuseboards – Eaton UK – Power Distribution - http://www.eaton.uk.com/EatonUK/ProductsSolutions/Electrical/ProductsServices/PowerDistributionMonitoring/LVS/IndustrialSwitchandFusegear/Exel-DistributionFuseboards/index.htm

 

[Michaelwgroves]

I don't like using Henley, it just looks like an after thought.

I've just got off phone from Hager technical. This project falls through the crack of domestic and commercial. His solution which I like is; cut-out into empty CU with 100A main switch, populate with Hager KRN190's which are simply a straight through 100A MCB, but without a breaker. You would wire straight from KRN190 to switched fuse which would then achieve discrimination.

Technical Properties KRN199 - http://www.hager.co.uk/product-catalogue/energy-distribution/enclosures/metal-enclosures/metal-enclosure-accessories/krn199/42687.htm