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?
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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
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See also diy.stackexchange.com/a/74996/58292 – Jon Sep 6 '16 at 16:40
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