How far can I run a low voltage cable from a transformer to a garden lighting product?
A. Cable loses voltage according to its length and the number & power of lights you connect to it, so keep low voltage cable runs as short as possible to optimise the performance of your garden lighting products. To minimise cable voltage drop to the luminaires, identify groups of lights which can be supplied from one central transformer. Check that the transformer location is within the length of the low voltage cable permitted (see voltage drop chart: In many rear gardens, a typical configuration may require one transformer on each side of the garden and perhaps one transformer to cover features at the far end of the garden. The 240 volt supply to the transformers should be via a steel wire armoured cable incorporating a separate core for earthing.
