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Of course it is extraneous ?. I’ll take a bond from the earths at the spur to the steel itself then ☺.
wrong... by that you would have to say that any room with electrical equipment fixed to the walls, is a part of the installation.How can a steel box forming the enclosure of the spur be an extraneous conductive part by definition,when it forms part of the electrical installation? Is it not an exposed conductive part rather than an extraneous conductive part ?