Cable entry into 17th edition compliant metal clad ccu

[bigsparks]

Hi All

I wanted to get an insight into how electricians were proposing to implement cable entries into metal clad ccu once it is compulsory in the new year. I have not been on the latest 17th edition update but through reading info in the IET and NICEIC member literature I have garnered that the biggest amendments are with the introduction of metal clad ccu & revised elz maximums.

We have now began installing metal clad ccu with rcbo devices, to future proof installations for our customers, and wanted to see how other electricians are carrying out cable entries into metal clad ccu.

For top/side entry into a metal clad ccu, is it suitable to use fire rated pvc glands for cable entry or can a knock out / hole big enough for all cables to enter be used as long as an intumescent sealant/foam is used thereafter to seal any spaces in that cut out?

Up until the present time, we have only had rear entry situations with metal clad ccu.

Thanks

 

[Lazlo]

Like this but other way around (image shows DB above trunking) ....

https://drive.google.com/file/d/0B9wD_rwO3uBlNDd6ckFlaTkyMEROTHlpelZYXy1pdG9PZUtJ/view?usp=sharing

ps the Hager board has no knock outs on bottom for cable entry only for tails on bottom right...... so it's top or rear or get drilling!

 

[richy3333]

Wylex have brought out the metal blanking plates!

I'd rather become a plumber than use anything that they make. Some argue that their product recall started this whole chain of sorry events!? Also heard they are still spending £30K a month on the recall and overall it's cost them millions

 

[Midwest]

Only annoying thing was the door to access MCBS etc didn't have a hinge that kept it open, that would make it much better in my opinion, can't see why they wouldn't add some spring clip hinges.

Do ya think that's got anything to do with its non combustibility, cos if you do it the house owner will?

 

[Redvanman]

I thought the the mcb's etc were non combustible
the pictures I've seen are the plastic casing melted away with the din rail and breakers still intake hence nothing to burn so no spread of fire
even so there is no need to fire stop cable entrances just make sure IP ratings are up to standard