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Metal - clad buildings and the confused forum member.

UKPN
One of the members has queried ESQCR bonding/earthing PME requirements for the above. So its worth spending a little time putting across the companies requirements. Where metal-clad buildings incorporate a steel-frame that utilises steel vertical beams that are within the foundations, the steel frame will provide a good connection with the earth which will effectively limit the earth potential rise.

A PME service may be provided to a metal-clad building provided the following criteria are satisfied:


1. The metal cladding is bonded to the steel-frame.

2. The supply is either three-phase with less than 40% unbalance or the supply is single - phase and the frame to earth impedance is les than 20ohms.

Regards, UKPN?

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  • 0
    Sparkingchip:



    I stand looking at installations and end up up with so many questions in my head.

    e4bffd996ab1139305dc0f900a75c938-original-20200517_133131.jpg


    A block of five units presumably with five electrical intakes, now walls have been knocked through and five have become two.


    Steel frames, steel cladding, steel roller shutter and steel personnel doors mounted into the other steel work, air conditioning units mounted externally on walls and floor standing on some slabs as

     in the photo.


    The EV charger has been installed as TT, so presumably the main installation is PME.


    Given the location of the rod immediately adjacent to the building and everything else that is going on in the photo was it worth doing so?


    Andy B.


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  • 0
    Sparkingchip:



    I stand looking at installations and end up up with so many questions in my head.

    e4bffd996ab1139305dc0f900a75c938-original-20200517_133131.jpg


    A block of five units presumably with five electrical intakes, now walls have been knocked through and five have become two.


    Steel frames, steel cladding, steel roller shutter and steel personnel doors mounted into the other steel work, air conditioning units mounted externally on walls and floor standing on some slabs as

     in the photo.


    The EV charger has been installed as TT, so presumably the main installation is PME.


    Given the location of the rod immediately adjacent to the building and everything else that is going on in the photo was it worth doing so?


    Andy B.


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