DiMAX Reverse Loop Module came today in the packet is 4 diodes ? what are they for,. The instructions say cable size for the Main track and Return loop should be 1.2 / 2mm sq not a problem but I assume I don't need cables that size for the sensor rails as I have a roll of twin .5mm sq that I could use for them. Final question anybody in the UK installed one of these in a waterproof junction box outside ? are they happy in a small enclosed plastic box all year round ? the Garden shed is too far away for it, and SWMBO won't be happy with more holes in he house walls with wires poking through them with my trains electrical bits attached on the end of them