Design of consumer units for amendment 3

[Guest666]

Non-combustible material” means material that does not burn or give off flammable vapours in sufficient quantity for self- ignition when heated to 750°C

 

[Guest666]

So in effect the distribution board will not catch fire itself if there is a fire started inside the distribution board.

 

[R G]

I can see different manufacturers will have their own interpretations and supply what they think is right , I heard the mention of wiska glands being used by some , I and others will just see what happens when it comes to it ...

 

[davesparks]

1. What is a definition of non-combustible?
There is no published definition for ‘non-combustible’ that aligns with the intent of regulation 421.1.201. Ferrous metal is deemed to be one example of a non-combustible material that meets the intent of the regulation.


2. What constitutes a ‘non-combustible enclosure’?
A non-combustible enclosure includes base, cover, door and any components e.g. hinges, covers, screws and catches, necessary to maintain fire containment. See diagram 1. Blanks and devices are contained within the non-combustible enclosure.

and as for cable entry's.

3. How is account taken of cable entries into a ‘non-combustible enclosure’ with respect to containment of internal fire and escape of flames?
Good workmanship and proper materials must be applied by the installer. The cable installation entry method shall, as far as is reasonably practicable, maintain the fire containment of the enclosure. Account shall be taken of the manufacturers instructions, if any.

Care to cite your references for that? Is it something the IET has published or is it a third party's interpretation/opinion?

 

[davesparks]

Non-combustible material” means material that does not burn or give off flammable vapours in sufficient quantity for self- ignition when heated to 750°C

Can you cite a reference for that?

 

[Guest666]

I can see different manufacturers will have their own interpretations and supply what they think is right , I heard the mention of wiska glands being used by some , I and others will just see what happens when it comes to it ...

The new amendment mentions nothing about cable entries into distribution boards over what has already been in previous versions of BS7671.

 

[Guest666]

Can you cite a reference for that?

Google lol.

Non-combustible material is a phrase used in many other industries long before the 3rd amendment was written.

 

[Leesparkykent]

Care to cite your references for that? Is it something the IET has published or is it a third party's interpretation/opinion?

The link in the OP.

 

[davesparks]

Google lol.

Non-combustible material is a phrase used in many other industries long before the 3rd amendment was written.

Yes if is a phrase used in many industries, but that doesn't mean their definitions if it can be applied to bs7671.

 

[davesparks]

The link in the OP.

So a third party and highly biased interpretation from a company which stands to profit from it. Not exactly the best source of useful information is it?

 

[Guest666]

Yes if is a phrase used in many industries, but that doesn't mean their definitions if it can be applied to bs7671.

I really don't think they are going to change the meaning of English words though.

Is is this better from the Oxford dictionary:

Made of material that does not burn if exposed to fire; incombustible.

 

[Leesparkykent]

So a third party and highly biased interpretation from a company which stands to profit from it. Not exactly the best source of useful information is it?

I don't understand what you are getting at TBH? I find the new reg about noncombustible DB's a load of bollox IMO. I just pointed out what 1 manufacturers stance was on the situation.

 

[R G]

So a third party and highly biased interpretation from a company which stands to profit from it. Not exactly the best source of useful information is it?

Well thats what we are discussing isn't it , thats what the op has posted ..lol...

 

[Redvanman]

I like the look of the Hagar boards.
I do believe they come with grommet strips (could be wrong).
They are made to be able to use different size trunking with the knock outs so that satisfies the IP issues and as said previously there is no provision needed to make the entries "fire sealed" as this is not mentioned in the new regulations.
Leesparky states the Beema reference which makes it clear what needs to be made and installed.
Also the cable clamps only come with the 30 version I think (could be wrong again) but sure it could be used in the 10 version.
The tails kit are great, used them for ages but it looks like they will not be used in the new boards.

 

[davesparks]

I really don't think they are going to change the meaning of English words though.

Is is this better from the Oxford dictionary:

Made of material that does not burn if exposed to fire; incombustible.

That's no specific enough for this application of the phrase, the temperature the material is going to be exposed to needs to be defined.
Steel will burn if exposed to fire of sufficient temperature,