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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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    I understood that some DNOs at least are now happy to provide multiple units in a steel framed structure with individual PME supplies - but with the proviso that the individual premises are supplied via SNE cables from a common point.


    The last point does rather beg the question why if 20 Ohms is good enough for single phase installations, why it's not also good for 3-phase installations with 40% or more imbalance.


       - Andy.
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  • 0
    I understood that some DNOs at least are now happy to provide multiple units in a steel framed structure with individual PME supplies - but with the proviso that the individual premises are supplied via SNE cables from a common point.


    The last point does rather beg the question why if 20 Ohms is good enough for single phase installations, why it's not also good for 3-phase installations with 40% or more imbalance.


       - Andy.
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