18th edition question

[chris day]

Not been on the 18th edition course yet.

In short what are the design changes I will need to implement come jan 1st on a domestic re-wire?

 

[Markyd]

A.F.Ds!

 

[Octopus]

521.10.202 is a very significant change which will require consideration to achieve compliance. I predict there will be an awful lot of non-compliant new builds and extensions during 2019, because many will just carry on as they always have.

Hum ......... so in a finished domestic premises how would anyone know or check this?

Serious question BTW

Little is done now to check any existing BS 7671 compliance - so why focus in on this?

 

[telectrix]

521.10.202 is a very significant change which will require consideration to achieve compliance. I predict there will be an awful lot of non-compliant new builds and extensions during 2019, because many will just carry on as they always have.

being a tight fist, i not got 18th book.can you paste that reg?

 

[Ian1981]

There’s not many instances where a new build would be effected by this other than if trunking is used to house the cables to the DB or any detached garages with surface conduit drops for accessories inside.

 

[Deleted member 9648]

Hum ......... so in a finished domestic premises how would anyone know or check this?

Serious question BTW

Little is done now to check any existing BS 7671 compliance - so why focus in on this?

Are you suggesting you will ignore this regulation?

being a tight fist, i not got 18th book.can you paste that reg?

521.10.202
Wiring systems shall be supported such that they will not be liable to premature collapse in the event of a fire.
This is a blanket requirement, no distinction is given to areas of wiring or type of installation. I have been informed that a plasterboard ceiling is not considered to provide support for cables in the event of a fire, and that all wiring throughout its length will require support with (for example) steel straps, unless it is drawn through joist holes.
This will have implications for rewires where cables are often fished through areas where floors are difficult or impractical to lift for access.

 

[Spoon]

I have been informed that a plasterboard ceiling is not considered to provide support for cables in the event of a fire, and that all wiring throughout its length will require support with (for example) steel straps, unless it is drawn through joist holes

The plasterboard comment is interesting... Who informed you of this?

 

[Spoon]

There’s not many instances where a new build would be effected by this other than if trunking is used to house the cables to the DB or any detached garages with surface conduit drops for accessories inside.

Plastic trunking is not the issue here as it will melt in the fire. The idea is to stop entanglement of firefighters with the copper cables within the trunking.

 

[Deleted member 9648]

The plasterboard comment is interesting... Who informed you of this?

Currently doing the 18th and this came from the tutor when we dissected the implication of the regulation. Got an NIC visit next month so will run it by him as well. But knowing how the IET interpret things it would not surprise me that plasterboard alone as a support would not meet the requirements

 

[netblindpaul]

Plasterboard has a 30 minute fire rating from building regulations.
Check the Electrcial Safety First website to see if the questions of plastic plugs has been addressed in the faq section.

 

[Deleted member 9648]

Plasterboard has a 30 minute fire rating from building regulations.
Check the Electrcial Safety First website to see if the questions of plastic plugs has been addressed in the faq section.

The fire rating of plasterboard was raised during the discussion, but this was not considered to meet the requirement for supporting wiring systems

 

[Octopus]

If this is so important, why is the reg in the BBB lacking vital information ?

And no I’m not suggesting anybody ignores it .... just that inspections on completed properties will make this almost impossible to verify ....

 

[Silly Sausage]

Are you suggesting you will ignore this regulation?


521.10.202
Wiring systems shall be supported such that they will not be liable to premature collapse in the event of a fire.
This is a blanket requirement, no distinction is given to areas of wiring or type of installation. I have been informed that a plasterboard ceiling is not considered to provide support for cables in the event of a fire, and that all wiring throughout its length will require support with (for example) steel straps, unless it is drawn through joist holes.
This will have implications for rewires where cables are often fished through areas where floors are difficult or impractical to lift for access.

Does that now over-rule a previous/current reg that cables could be laid, horizontally, unsupported in an inaccessible void?

 

[Deleted member 9648]

Does that now over-rule a previous/current reg that cables could be laid, horizontally, unsupported in an inaccessible void?

If such cables were 'liable to premature collapse in the event of a fire'...then yes it would.

 

[Deleted member 9648]

If this is so important, why is the reg in the BBB lacking vital information ?

How much vital information do you want? The regulation is very clear as far as I can see. Wiring systems must be installed to stay put and not collapse in the event of a fire. That clearly means they must be supported by fire resistant fixings to the structure of the building

 

[Silly Sausage]

If such cables were 'liable to premature collapse in the event of a fire'...then yes it would.

Would that apply to singles in PVC conduit laid between joists?