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Cross sectional area of a protective conductors

MS01
Can someone give me a some advice on if we have a earth electrode system made up of the structural rebar when using the adiabatic equation to size of the bonding conductor comes out at 300mm. MY questions is does each bond need to be this size or can it be made up via a series of smaller bonds that are equal or exceed the 300mm requirement? My opinion is each bond needs to be this size to deal with the fault current as the direction it will flow is unknown. What are peoples thoughts? I cannot see anything in the regs on this.

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    What is the voltage and current of the system, and what is the electrode resistance to terra- firma.?


    Unless this is part of a lightning system or perhaps an indoor substation,  I'd be surprised if any electrode on an LV system, could really sink enough current to need a 300mm bond during the time needed to clear a fault, and 'd have no issue with doing that  with a small no. of more conveneint sized cables.

    What is the cross section of the re-bar that you are connecting to ? After all there is no point in connecting 300mm sq of copper to 500mm2 of steel ?
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  • 0
    What is the voltage and current of the system, and what is the electrode resistance to terra- firma.?


    Unless this is part of a lightning system or perhaps an indoor substation,  I'd be surprised if any electrode on an LV system, could really sink enough current to need a 300mm bond during the time needed to clear a fault, and 'd have no issue with doing that  with a small no. of more conveneint sized cables.

    What is the cross section of the re-bar that you are connecting to ? After all there is no point in connecting 300mm sq of copper to 500mm2 of steel ?
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