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Bonding conductor sizes
Former Community Member
What is the reason for bonding conductors being sized according to the size of the supply neutral? I can see how earthing conductors / cpc’s are selected according to adiabatic considerations: making sure they can stand up to a fault. I understand that the bonding is to maintain an equipotential zone but how does the neutral csa and bonding csa relate to this?
Because of heavy diverted N currents. With TN-C-S supplies, a broken PEN conductor somewhere in the street could involve the N current from the part of the street beyond the break being diverted via bonding along e.g. a metal water pipe and into a house on the other side of the break then, via further bonding back to the unbroken part of the PEN.
Which is also a good reason to bond in the first place!
Because of heavy diverted N currents. With TN-C-S supplies, a broken PEN conductor somewhere in the street could involve the N current from the part of the street beyond the break being diverted via bonding along e.g. a metal water pipe and into a house on the other side of the break then, via further bonding back to the unbroken part of the PEN.
Which is also a good reason to bond in the first place!
