John Dalgetty asks about possible RCD protection for the SWA cable at a consumer unit (CU) supplying a septic tank pump. It is answered by the ECA (Theme – Fire, Safety & Security):
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Question: I have currently installed an SWA cable to supply an exterior sump pump for a septic tank system for a domestic dwelling.
The exterior pump panel has been pre-wired with 30mA RCD protection as factory specification.
Is there a requirement to RCD protect the SWA cable at the house consumer unit?
Answer: An RCD would not be required, provided that the Zs is sufficiently low to meet the disconnection time.
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