I have a small laundry room which is outside the main house. To get
power to it I have taken a 4mm T&E radial through the external house
wall and then into the laundry room via the door frame - this was the
only feasable route. The run of cable outside is about 1 meter and I
have chased out a channel in the render for it to run in. Is it ok to
just render over or should I encase it somehow? I did think of using
SWA but decided that it wasn't really necessary.
Your main issues are mechanical protection and UV protection. The render
should provide UV protection, but I would cap the cable with capping or
conduit before rendering. This will make it much stronger should the wall be
hit by something (i.e. a ladder, or furniture being moved).
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