Why is it in the lighting circuit a separate earth wire is drawn in p.v.c conduit type of installation and not in steel type?

  • Not clear. Is it a separate PVC conduit or a separate earth wire you're talking about? Is your question about an existing installation, typical installations in a particular country, perhaps a guideline you were reading or something else entirely? – Dmitry Grigoryev Sep 6 '16 at 13:21
  • See also diy.stackexchange.com/a/74996/58292 – Jon Sep 6 '16 at 16:40

Because it's legal to use a continuous metallic conduit as the grounding conductor. If the conduit is not conductive, a wire must be pulled to act as the grounding conductor.

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