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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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  • Former Community Member
    0 Former Community Member
    Can you describe, in a bit more detail, or show a sketch of, the conductor you are talking about because there is something adrift with the numbers being quoted.


    If it's the connection from the switchboard back to the transformer star point then this is usually the "neutral" conductor - everything else is G/Y and is probably either equipotential bonding, or the connection to the neutral to create the reference - so even in a 5MVA installation probably isn't bigger than a range between (say) 50mm2 and 95mm2


    Regards


    OMS
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  • Former Community Member
    0 Former Community Member
    Can you describe, in a bit more detail, or show a sketch of, the conductor you are talking about because there is something adrift with the numbers being quoted.


    If it's the connection from the switchboard back to the transformer star point then this is usually the "neutral" conductor - everything else is G/Y and is probably either equipotential bonding, or the connection to the neutral to create the reference - so even in a 5MVA installation probably isn't bigger than a range between (say) 50mm2 and 95mm2


    Regards


    OMS
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