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What does happen when an accidental connection of the conductor phase to the ground connection system of computer network and information technology (IT) systems occur?
Former Community Member
What does happen when an accidental connection of the conductor phase to the ground connection system of computer network and information technology (IT) systems occur? And What things can we do for preventing of this accidental ?
Like any other system, at the point of fault, L and E now are at the same voltage, and the voltage slopes down from the origin to the point of fault along the live path, and it slopes upwards from the supply earth point towards the point of fault, the voltage gradient in proportion to the resistances of the different paths.
The complexity with an IT system is that it is likely to have connections to other things, such as network cables to to hubs, printers, video displays, and all manner of things, some of which are not on the same circuit, and may not even be in the same building.
The common strategy is to make the resistance (and so the voltage change) in the earth part of the path low compared to that in the live side. Racks are earthed, as is every item in it, There may be additional earth bonding to common earth planes, as this only works indoors, network cables leaving the site are hopefully opto-isolated or ideally optic fibres. ADS is organised to remove power to just the faulty section if at all possible , especially if the system is processing valuable data (bank records anyone). The interaction of UPS and fault behaviour needs to be considered, and there can be quite a lot to it.
Like any other system, at the point of fault, L and E now are at the same voltage, and the voltage slopes down from the origin to the point of fault along the live path, and it slopes upwards from the supply earth point towards the point of fault, the voltage gradient in proportion to the resistances of the different paths.
The complexity with an IT system is that it is likely to have connections to other things, such as network cables to to hubs, printers, video displays, and all manner of things, some of which are not on the same circuit, and may not even be in the same building.
The common strategy is to make the resistance (and so the voltage change) in the earth part of the path low compared to that in the live side. Racks are earthed, as is every item in it, There may be additional earth bonding to common earth planes, as this only works indoors, network cables leaving the site are hopefully opto-isolated or ideally optic fibres. ADS is organised to remove power to just the faulty section if at all possible , especially if the system is processing valuable data (bank records anyone). The interaction of UPS and fault behaviour needs to be considered, and there can be quite a lot to it.
