When wiring a 240 volt AC circuit, I've always assumed that it's important for L1 and L2 wires to be the exact same length, in order to avoid introducing a phase shift that would reduce peak voltage. Length differences can accumulate when the wires enter a panel and need to go slightly different places. However I can't find any information about this when I search. Is this true, or am i just being paranoid? is there any standards/ rules about this?