Example 1 -'In-line' wiring configuration
Transformer size and load
Add up the total wattage of the lamps in the circuit.
20+20+20+20 =80watts. The transformer required is a 100w.
Cable size and length
Measure the distance of cable required to reach all the light fittings.
36m. Therefore the cable required is 36metres of 4mm cable.
Example 2 -'Tee-line' wiring configuration
Transformer and load
Add up the total wattage of the lamps in the circuit.
20+20+20+20 =80watts The transformer required is a 100w
Cable and length
Measure the distance of cable required to reach all the light fittings.
Left hand run: 6m plus 30m =36m
Right hand run: 6m plus 30m = 36m
Therefore the cable required for the left hand run is 36metres of 4mm cable and another 30m for the right hand run. total 66m of 4mm cable.
