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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
    broadgage:

    At the generator I would connect together all the following

    Alternator star point.

    Frame or enclosure of the machine.

    One or more local earth rods.

    Outgoing neutral conductor to load.

    Outgoing earth conductor to load.

    Any nearby building metalwork or pipes etc.

    A suitable bonding conductor to the MET of the existing installation. (Unless the existing DNO supplied installation is so distant as to render this irrelevant)


    The supply from the generator to the load will therefore be 5 wire, with a seperate neutral and earth, so as to resemble a public supply of type TN-S.


    Thanks, this is along the lines of what I was thinking.

    I was unsure about connection to the MET as I thought I read somewhere not to do this? There again if I bond to anything which is bonded to the MET then thats pretty much the same thing!

    RCDs??


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  • 0
    broadgage:

    At the generator I would connect together all the following

    Alternator star point.

    Frame or enclosure of the machine.

    One or more local earth rods.

    Outgoing neutral conductor to load.

    Outgoing earth conductor to load.

    Any nearby building metalwork or pipes etc.

    A suitable bonding conductor to the MET of the existing installation. (Unless the existing DNO supplied installation is so distant as to render this irrelevant)


    The supply from the generator to the load will therefore be 5 wire, with a seperate neutral and earth, so as to resemble a public supply of type TN-S.


    Thanks, this is along the lines of what I was thinking.

    I was unsure about connection to the MET as I thought I read somewhere not to do this? There again if I bond to anything which is bonded to the MET then thats pretty much the same thing!

    RCDs??


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