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Extend TT to out building or separate TT ?

Hi guys.  I Have to take a sub-main to a large external outbuilding.  It is basically a domestic garage but larger than some houses that i have wired not that size matters.


The existing house has a TT earth.  The garage is a good 30 meters away.   Can anyone see a problem with me installing a second spike at the garage and linking it to the house earth as well as a belt and braces type thing or would it be better to keep them separate ?  ( I don't anticipate there being any particular problem with getting a decent Ra at either end)



Gary
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  • Hi Gary

    You can link them without problems, and two never hurt! A TT Earth system can be as large as you like, think of a farm with several buildings with steelwork into the ground and grids in the floors. It just makes it work better if anything as the Re is lower so the voltage during faults is a bit lower.


    David
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  • Hi Gary

    You can link them without problems, and two never hurt! A TT Earth system can be as large as you like, think of a farm with several buildings with steelwork into the ground and grids in the floors. It just makes it work better if anything as the Re is lower so the voltage during faults is a bit lower.


    David
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