543.6.1 the protective conductor shall be incorporated in the same wiring system as live conductors (re: overcurrent protection)

Question

Hello good day to all 
 
 In an *all* PVC trunk/conduit wiring system (using insulated single conductors), what is the implication of 543.6.1 ? 
 - does it mean that a protective conductor (shared or per circuit) has to be in *each* part of the wiring system that a live conductor runs or close by ? 
 e.g. one cannot send feed and switched live on their own down to a switch with a cpc coming to the switch from elsewhere 
 
 If yes or no, what is the safety issue intended to be addressed with this one ? 
 It feels like I am misinterpreting this. 
 
 Cheers 
 Habs

psychicwarrior · Accepted Answer

Thank you AJJ , I agree with wiring to remove as many issues as possible. 
 The 'loop-in' (3-plate) is the best approach to avoid all these issue, but it does come with a 'penalty' of more cables running to the grid switch (in the virtual example I gave earlier) epecially in all pvc containment. It seems how twin and earth might mandates the wiring routing approach is what is 'best' to follow where possible ... even if wiring in singles . 
 Good lighting wiring design experience in complex lighting settings would seem to be a good skill ;-). 
 I think 'spider wiring' (the right way) can be very useful and efficient if from a central [to the installation] junction panel enclosure and where all the conductors radiate out from that to the points of use. 
 I will rest on this one as Im now fed up of it too. :-) Cheers everyone.

543.6.1 the protective conductor shall be incorporated in the same wiring system as live conductors (re: overcurrent protection)

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