Back Boxes for 57.5mm Dab n Dot Insulated Plaster Board

[Cid]

No - it may reduce the current carrying capacity of the cable

 

[Jamie Harper]

No - it may reduce the current carrying capacity of the cable

Could you elaborate? Are you thinking of the thermal heating element of touching the insulation?

 

[Cid]

I don't know if you're an electrician or not but I'm talking about the effect insulation has on cables. Some brief information here TLC Electrical Supplies - https://www.tlc-direct.co.uk/Book/4.3.6.htm

 

[Jamie Harper]

I don't know if you're an electrician or not but I'm talking about the effect insulation has on cables. Some brief information here TLC Electrical Supplies - https://www.tlc-direct.co.uk/Book/4.3.6.htm

Thanks for that, I am not an electrician no, electronic engineer mind, so not too far away! Had a feeling it was to do with that, will have a read.
I will be capping the cable against the solid brick wall, and then its protecting the cable from there really. Maybe plastic boxes are better, possible to rout the cable through conduit through the insulation.

 

[DPG]

How are you going test and certify this installation?

 

[Jamie Harper]

How are you going test and certify this installation?

I have an local electrician who has agreed to sign off. He will monitor the work throughout. Just wanted to get everything right first time, know as much as possible and make sure the installation goes smoothly.

 

[DPG]

Fair enough. Is he involved already to advise on cable sizes and routes though?

 

[Flanders]

You could try these, not used them my self but may leave a better finish. The problem with the plastic dry lining boxes is that they bring the edge of accessory out a tinny bit from the wall from which may be a problem if you are looking for a high standard of finish or fitting flat plate accessories .

2 Gang 35mm Fire & Acoustic Metal Dry Lining Plasterboard Box - https://www.tlc-direct.co.uk/Products/FB4235.html?source=adwords&ad_position=&ad_id=315107931576&placement=&kw=&network=u&matchtype=&ad_type=&product_id=FB4235&product_partition_id=297072075353&version=finalurl_v3&gclid=EAIaIQobChMI65CioqPX4AIVTDPTCh2OqAh4EAQYAiABEgIwT_D_BwE

 

[Jamie Harper]

Fair enough. Is he involved already to advise on cable sizes and routes though?

He has been involved yes, just dont want to constantly be pestering him!
I have done some calculations for cable sizes, but I forgot to take into account the insulation. Luckily not bought all the cable yet!

In regards to routing through, I have planned it all out ready.

 

[Jamie Harper]

You could try these, not used them my self but may leave a better finish. The problem with the plastic dry lining boxes is that they bring the edge of accessory out a tinny bit from the wall from which may be a problem if you are looking for a high standard of finish or fitting flat plate accessories .

2 Gang 35mm Fire & Acoustic Metal Dry Lining Plasterboard Box - https://www.tlc-direct.co.uk/Products/FB4235.html?source=adwords&ad_position=&ad_id=315107931576&placement=&kw=&network=u&matchtype=&ad_type=&product_id=FB4235&product_partition_id=297072075353&version=finalurl_v3&gclid=EAIaIQobChMI65CioqPX4AIVTDPTCh2OqAh4EAQYAiABEgIwT_D_BwE

Nice thought, guess ill be paying for the high quality finish. Would still need some conduit to run the cable through the insulation? Or do I just use the de-rating factor in calcs? Or Both!!?