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Private building - External Lighting and RCD requirements

Apostolos
Good afternoon.

I have a private building (student accomodation) which has two types of external lighting

1. Plastic luminaires around the building fixed on the face of the building

2. A mix of metal lighting columns and plastic bollards in the courtyard

I want to confirm tif we need according to BS7671 any RCDs.

The cables to the face of the building are not at any length chased into walls or partitions.

The cables to the columns and bollards are buried underground in ducts.

I do not see anything that would dictate RCDs, at least in the luminaires in the face of the building. I am not so sure about the steel columns.

Any ideas or previous experience is much appreciated.

Kind Regards
  • 0
    Is the cable armoured ?

    Is the supply to the building that supplies the lamp posts PME ?


  • 0
    Yes it is PME and yes for the lamp posts and the bollards we use SWA cables.

    For the face of the building we will wire in twin and earth from within the ceiling void on cable baskets.

    However why does this matter?

    I am trying to understand where you are going with that ?
  • 0

    I am trying to understand where you are going with that



    Many people have an adversion to PME being used outdoors - especially for large metal items that are easily within reach and similuaneously so with the general mass of the earth - hence they might have been TT'd and so require RCDs for normal ADS requirements. (Normal street lighting columns do typically use PME earth, but in mitigation usually have an additional electrode and don't share the supply with a large installation that makes the additional electrode approach unworkable).


      - Andy.

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