Is it allowed under IEE wiring regulations to fit an electric shower with wiring enclosed by mini-trunking?
Whether or not you own the home, you still need to comply with the LOCAL rules and laws! You could be complying with the NEC, and still be in violation of Fire Safety Codes and Zoning Ordinances so that when you have ANY insurance probelm, you will lose all coverage! It is VERY poor idea to run ANY electrical wiring in a wet or moist area! Even if it is ‘Low Voltage”, like in my zone it is under 38Volts, NOT the 50Volts of the NEC! When you are wet, the current required to kill you is so much lowered! Get a professional, an expert, as their insurance will cover the job and all liability issues, plus the code enforcement, permits, etc., also!