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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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    point 2 could be read either ((3P+<40%unbalance OR SP) AND (Z<20Ohms)), or ((3P+<40%unbalance) OR (SP AND Z<20Ohms))

    It could be clearer, but thanks for sharing UKPN
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  • 0
    point 2 could be read either ((3P+<40%unbalance OR SP) AND (Z<20Ohms)), or ((3P+<40%unbalance) OR (SP AND Z<20Ohms))

    It could be clearer, but thanks for sharing UKPN
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