Qualified electrician here but doing some DIY with regards to moving our intercom from the front door to our new driveway gates. Is there a particular, more rugged type of 8-core you can by that is okay with immersion in water etc. Our builders positioned flexible conduit in strategic positions anticipating sensors for the gates however from previous experience flexible conduit is about as watertight as a sieve. I'd rather go for belts and braces and use a high-quality cable that won't perish if low points take on water.