Harry Bloomfield wrote:

1. The cable should have been provided with some mechanical protection,

Yes

it is against regulations to install the bare PVC in a wall without this.

and no.

It is ok to install PVC directly into a wall - even without mechanical
protection so long as it follows an "expected" route. This means
horizontaly or vertically aligned with a visible accessory, or within a
150mm zone beside a room corner or adjacent to the ceiling.

Since this cable does not follow the expected route (i.e. turns a corner
above the extractor), it ought to be either 50mm deep (from both sides
of the wall - so tricky in a 4" wall) or be capped.

2. From the photos it looks as if the actual cable size used is too
small. Difficult to be certain, however.... It looks like 1.5mm and
regulations require 2.5mm be used at least as far as the spur, which
needs to be of the fused type.

The "spur" is technically the run from the socket to the FCU. Since it
is unfused it should be 2.5mm^2, (1.5mm^2 for a fused spur). The FCU
needs to be fused appropriately for the cable feeding the hood.


--
Cheers,

John.

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