Garage cable mounting

[tom6]

Hi All,

Looking for some confirmation / advice.

I have recently built a garage and will be getting it wired shortly, it is of timber frame construction and timber cladding outside and will have kingspan insulation with plasterboard finish inside with all joints taped and plastered.

Is it ok for all cables to be mounted behind the kingspan insulation obviously supported with clips where required. All the cabling will be ran in the loft and just dropped down the wall for sockets & light switches

Many thanks

 

[telectrix]

you'd need to derate your cables by 50%. eg. 2.5mm will be down to 13A. personally, i'd do the drops surface in mini-trunking or pvc conduit and use surface boxes.

 

[tom6]

Perfect thanks for the clarification, will go with the PVC conduit drops.

 

[telectrix]

i would use the shatterproof boxes with 20mm knockouts, and with adaptors on the conduit. makes a neat job.

 

[ChrisElectrical88]

i would use the shatterproof boxes with 20mm knockouts, and with adaptors on the conduit. makes a neat job.

I would use galv conduit, makes it even neater

 

[Dizzy_Maskell]

i would use the shatterproof boxes with 20mm knockouts, and with adaptors on the conduit. makes a neat job.

I would use galv conduit, makes it even neater

Id go full swa with metal glad fixings cable tray and drop in a linked out three phase board to power it!!!!!!!

 

[ChrisElectrical88]

Id go full swa with metal glad fixings cable tray and drop in a linked out three phase board to power it!!!!!!!

High bay lighting installed and get a roller shutter door put in whilst your at it!

 

[Engineer54]

If this is going to be a bog standard garage, that only needs power for a bit of lighting and the odd power tool on occasions is the derating really going to be an issue?? Could even use 4mm radial(s) if you're that worried.

Trouble with surface work in a domestic garage, is that it collects dust and debris and ends up looking tired over time. Seeing as you're going to the lengths of boarding this garage out, think i'd prefer to see flushed outlets and switches.

 

[Rockingit]

Seeing as you're going to the lengths of boarding this garage out, think i'd prefer to see flushed outlets and switches.

I did a six car garage on a newbuild a while back that had something like a dozen flush sockets, walls plastered, log burner, loft insulated... it was every bit as good and the same size as a bungalow!!

 

[Marvo]

I've moved this to the DIY forum for you Tom.

I'd also add that certain types of styrofoam/polystyrene insulation can cause PVC cable sheath to deteriorate quite rapidly so conduit or trunking may be necessary where contact may occur.