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Totally irrelevant. And there is nothing in the Regs about making a CU 'airtight' , if anything that's counter productive as we're told to install in such a way to minimise the build up of heat or words to that effect.
As far as is reasonably practicable, to contain any fire within the enclosure or cabinet and to minimise the escape of flames.
 
I can just imagine Delroys face when he turn up to do a Youtuber domestic board change this year only to find some sparky has completely filled it to the brim with builders foam...

NO WAY NO WAY A QUALIFIED ELECTRICIAN DONE THAT I CAN'T SEE IT
 
Imagine telling a customer that they need to spend a load of money on a new metal consumer unit, telling them how much safer it is in a fire and then leaving a dirty great hole in their wall partition.

There is no argument for not sealing it up.
 
Imagine telling a customer that they need to spend a load of money on a new metal consumer unit, telling them how much safer it is in a fire and then leaving a dirty great hole in their wall partition.

There is no argument for not sealing it up.
Here we go again 😀

I tried using that naff grommet strip, including super gluing it, never stays it place, even when carefully inserting a larger cable. Hager bespoke grommet is the same. Manufacturers should come up with something more substantial.
 
Totally irrelevant. And there is nothing in the Regs about making a CU 'airtight' , if anything that's counter productive as we're told to install in such a way to minimise the build up of heat or words to that effect.
I think that most people would know what Brian meant when saying “airtight”.

Also, I don't understand how you can disagree about leaving a dirty, great hole in a wall cavity.

Have a read of section 527.
 
I think that most people would know what Brian meant when saying “airtight”.

Also, I don't understand how you can disagree about leaving a dirty, great hole in a wall cavity.

Have a read of section 527.
Has the penetration breached a fire compartment because if not no further action is required.
 
Has the penetration breached a fire compartment because if not no further action is required.


The metal CU should be treated as a form of fire barrier/containment, that being the whole reason for having metal CUs in the first place.

Cutting a hole that size in a wooden partition and leaving it cannot be said to be the work of a decent electrician.
 

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