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I am in Indonesia and electrical installations are haphazard and dangerous, so I will start off by saying there is not really a lot of point in trying to reference a national standard here.

Also no light switches are grounded, but plug sockets have grounding but it's rarely connected.

So, thinking about a lighting circuit using 1-way switches, what are the relative merits of using single NYA cables compared to NYM

Edit: cable will use conduit and junction boxes.

NYA:

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2-core NYM:

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Nya in your photo is single conductor in most other parts of the world it requires a conduit for protection of the conductors. Nym in your photo has 2 conductors with an outer protective covering so no conduit is needed for internal wiring. From what I can see this would be the difference.

Edit: since adding the job will be in conduit with junction boxes the nya is the way to go it will pull easier and cost less than nym

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    Coming from the US, I'd suggest the NYM cable, but, as the OP noted in his question Indonesia seems to be the "wild, wild west" when it comes to electrical safety requirements, it's probably mostly down to cost as to which to choose.
    – FreeMan
    Jun 16, 2021 at 14:32
  • @freeman I fully agree if not in conduit I would also use nym.
    – Ed Beal
    Jun 16, 2021 at 14:39
  • I should have said in my OP but conduit is fairly commonly used.
    – thelawnet
    Jun 16, 2021 at 16:25
  • also differences I can see: NYA - could use a different colour for the cable to and from the switch? NYM - more physical protection. NYA - can route the live and neutral wire separately possibly saving cable
    – thelawnet
    Jun 16, 2021 at 17:22
  • Thelawnet if in conduit nym would be better protected but usually much more expensive in conduit. Multiple circuits can be run in conduit. In my location residential rarely uses conduit except for the main service feeder. Commercial and heavy industrial almost exclusively conduit. Since you have added that you will be using conduit and junction boxes nym has no advantage it is actually harder to pull in conduit.
    – Ed Beal
    Jun 16, 2021 at 17:56

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