Multiple electrical cables in 1 duct?

[Dunc]

My build will have an attached garage. If I put the consumer unit in the garage can all of the electrical cables from it be fed through a single duct through the insulated house wall (300mm cellulose fill) and then sealed? Perhaps using one of those mulit-cable conduit seals such as https://www.filoform.co.uk/filoseal-hd-re-enterable-duct-sealing.

Or am I better to find space to put the CU inside the thermal envelope?

[JohnMo]

6 hours ago, Dunc said:

Or am I better to find space to put the CU inside the thermal envelope

 

I would have the CU inside the house, then just a single incomer. Use a hockey stick tube and then easy to seal at floor level. Then take power to the garage with a single cable to a dedicated CU for the garage.