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I want to install a supply to portacabin ..details as follows:
Cable distance 35m - from CU - through ceiling void - exit main building - underground for 10m to unit.
Supply at CU in main building is TN-S.
As I understand the regs - TN-S supply means I don't need to spike at portacabin??
Does the SWA need any additional protection underground (apart from marking with electrical warning tape?
Does the SWA need to be terminated at an external/internal isolator at the p/cabin, or can it be directly connected to the CU in the p/cabin?
Finally, does the supply require RCD protection at the first CU or is RCD protection at the P/cabin CU sufficient?
Thanks in advance.
 
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