Outside lights tripping RCCB

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Recently, switching on our garden lights causes them to flicker momentarily then the RCCB trips. The cabling is fun in conduit to two low level lights mounted on a low wall so I'm thinking that some moisture might have entered after the recent heavy rains. Is there any way to test this, other than dig/strip the whole lot out? Thanks.
 
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If the cables strung between them, you could try disconnecting sections of it to narrow down the area where the fault exists?
 
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Water will get into anywhere that it can. Problems are worse if outdoor items do not have any drain holes provided.

Damp will also casue problems. I recently found a problem in the base of a lighting bollard. Ants had made a nice nest in there, which went right up to the power connection. When it rained, the damp wicked up the ants nest and the RCD tripped
 
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