Quote Originally Posted by imagine View Post
im pretty good on domestic electrics, its not much different to plumbing a heating system in really, except you cant see it
Contrary to popular belief domestic electrics is NOT always simple and is certainly more involved than plumbing IF DONE PROPERLY. ALL electrical circuits domestic or otherwise should be designed that in the event of a fault the circuit is automatically disconnected in a prescribed time laid down in BS7671 IEE wiring regulations. Choice of the correct size cables and circuit protection depending on the length of cable runs and environmental conditions is crucial to achieving disconnection times that will give you a safe installation. The maximum current a cable can take will change according to the environment its in, so somewhere like the Philippines where the ambient temperature is higher would also affect the cable sizes needed to achieve safe disconnection times as does the type of insulation or whatever surrounding the cables.
Design of any electrical system will need to start with determining the nature of the supply in to the house.