Hong Kong Regulations
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ELECTRICITY SUPPLY REGULATIONS - REGULATION 19
High pressure lines laid above ground or in subways
Every portion of any high pressure electric line placed above the surface of
the ground, or in any subway not in the sole occupation of the company, shall
be completely inclosed either in a tube of highly insulating material embedded
in brickwork, masonry or cement-concrete, or in strong metal casing
efficiently connected with earth.
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