Next I will be putting on the external cladding of my timber frame (Cedral Lap planks). Beforehand I am looking at all the penetrations through the exterior wall.
One penetration is the wire for the ASHP controller's weather-compensation sensor (see image below of the sensor).
The manual says "Connection wire is 2 x 0.75 mm²".Google says this is "2192Y" wire, which seems to be a common type cheaply available from Screwfix, etc.
Should I …
just buy a roll of that wire?
install it through the wall with a loop outside and a longer loop inside?
Should I use a cover plate (see below in orange)? Or instead just slope the penetration downwards and back fill with silicon?
This is my first bit of "wiring" so would appreciate any advice and suggestions.