Leonard Chichester asks this question, which concerns whether an aluminium street lighting column should have a separate earth installed. It has been answered by SELECT (Theme - Lighting):
Question: I have a street lighting installation where the street light is fed directly from a mini control pillar in 1.5mm2 arctic flexible cable. The control pillar has a cut-out installed that is fed via 16mm2 SWA cable. The only access to the column - which is in aluminium - is from the lantern; hence the mini pillar, as the column is surrounded by a cage that shrubs will later grow and climb around.
Should the aluminium column have a separate earth installed?
Also, as the cage is clamped around the column, should it also be earthed?
Some have; some don't, and the contractor carrying out remedial work believes that the flex earth is sufficient. Is that correct?
Answer: From BS 7671:2008 (2011) - Regulation 559.4.1, this states that every luminaire should be fitted in accordance with the manufacturer's instructions.
You should also provide a circuit protective conductor (CPC) at every relevant point in the installation.
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