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Advice was structural steelwork a last resort for an earth electrode:why?

hertzal123
Rang my scheme tech helpline recently with a query about TT earth electrodes and was told the above.

Seemed odd as I have got readings as low as 8 ohms on rsjs in farm buildings in the past.

                                                                                                             Regards,

                                                                                                                       Hz
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    hertzal123:

    Rang my scheme tech helpline recently with a query about TT earth electrodes and was told the above.

    Seemed odd as I have got readings as low as 8 ohms on rsjs in farm buildings in the past.

                                                                                                                 Regards,

                                                                                                                           Hz




    411.5.1


    Definitions, Earth Electrode Part 2 B.S. 7671.


    Suitable types of earth electrode. 542.2.2.


    542.2.3


    The system will be R.C.D. protected if it is a TT arrangement. So the resistance can be higher than single figures.   531.3.5.3.2 and Table 53.1


    Z.

Reply
  • 0

    hertzal123:

    Rang my scheme tech helpline recently with a query about TT earth electrodes and was told the above.

    Seemed odd as I have got readings as low as 8 ohms on rsjs in farm buildings in the past.

                                                                                                                 Regards,

                                                                                                                           Hz




    411.5.1


    Definitions, Earth Electrode Part 2 B.S. 7671.


    Suitable types of earth electrode. 542.2.2.


    542.2.3


    The system will be R.C.D. protected if it is a TT arrangement. So the resistance can be higher than single figures.   531.3.5.3.2 and Table 53.1


    Z.

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