Suppliying two out buildings, from a domestic installation 100A, TT supply

[tex431]

The incoming supply is split at the house via a Henly block. One supply feeding the house, Then one feed to a 100A/100mA type S dual pole switch feeding the out buildings both having 30m/A Rcd main switch. The cable is 3 core 16mm swa through out, first out building is 15metres away, then second building is 80metres away from first building.
-Is it acceptable to piggy back ingoing and out going cables in the first out buildings consumer units' main switch to supply the second building?


I presume being a TT earthing arrangement you would have a rod for each consumer unit (ie 1 in house,1 in first building, and 1 second building) so in theory they would be all connected together. Would that comply with reg 542.1.8? (p126 red bible)
or would it be best to keep both supplies separate?

Thanks

 

[Deleted member 9648]

The incoming supply is split at the house via a Henly block. One supply feeding the house, Then one feed to a 100A/100mA type S dual pole switch feeding the out buildings both having 30m/A Rcd main switch. The cable is 3 core 16mm swa through out, first out building is 15metres away, then second building is 80metres away from first building.
-Is it acceptable to piggy back ingoing and out going cables in the first out buildings consumer units' main switch to supply the second building?
Yes...

I presume being a TT earthing arrangement you would have a rod for each consumer unit (ie 1 in house,1 in first building, and 1 second building) so in theory they would be all connected together. Would that comply with reg 542.1.8? (p126 red bible)
or would it be best to keep both supplies separate?
As long as they are fed from the same source one earthing system can be utilised,no need for separate systems,if rods are linked they are one system......524.1.8 concerns installations with separate earthing arrangements,not the case here.
Thanks

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