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Fixed diesel generator earthing

D4G
Hi folks, i'm after your knowledge again!


I have a 184KW diesel generator which is to supply a test bay for testing machines to big for the building supply.  The generated supply will not be used/connected to the building supply.

Would the earthing arrangements be as TT with a rod at the generator connected to the neutral/star connection?


Thanks in advance ?
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  • 0
    The genset should be able to operate its own ADS in a suitably safe time against credible failure modes - if the non RCD cables are armoured, and the armour is properly earthed, then you probably will not need to add an RCD, at least for anything that can be considered to work like a sub-main - the idea is that any damage to the cable connects to the earthed armour first.

    At the load end, it rather depends how it is being used. Test rig sounds like cables get connected and disconnected fairly often so  a faulty connection, or a missing earth, or indeed just a defective unit under test, may be more likely than in a normal fixed installation. Clearly if you are supplying sockets and or  portable kit as well, then these need RCD cover, but that maybe just for a smaller sub section of the system.
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  • 0
    The genset should be able to operate its own ADS in a suitably safe time against credible failure modes - if the non RCD cables are armoured, and the armour is properly earthed, then you probably will not need to add an RCD, at least for anything that can be considered to work like a sub-main - the idea is that any damage to the cable connects to the earthed armour first.

    At the load end, it rather depends how it is being used. Test rig sounds like cables get connected and disconnected fairly often so  a faulty connection, or a missing earth, or indeed just a defective unit under test, may be more likely than in a normal fixed installation. Clearly if you are supplying sockets and or  portable kit as well, then these need RCD cover, but that maybe just for a smaller sub section of the system.
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