I have been installing lighting from a 3 phase board. The wiring schematic has instructed me to place an l1 and l2 feed into the same switch box. Is this not bad practise? Would it be better to put 2 L1 feeds to it instead? Therefore there would only be 230v at the switch. Also , am i correct in assuming the potential across 2 L1 feeds would in fact be 0?