Water tight underground chamber

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I'm installing some of the small 12v led marker lights up some steps in the garden. The problem I have is the transformer is a plug, but must be kept in doors. Has anyone used a box or junction box that I could bury in the surface of the garden that is water tight that I could install the power? Another option is a new transformer that I can use outdoors? But how do I size one cause I can't find anything with the same output.

Regards,
Ant
 
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There is nowhere to put the box? What was your thoughts?

Ant
 
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If at all possible I would try and find a place to hide a box above ground and include a drain hole in the bottom of the box. Over time seals often leak and if there is nowhere for the water to drain to even a very slight leak can end up with a box full of water.
 
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extend the (extra)low-voltage wire between the transformer and the first light with waterproof connectors. Cheaper and safer than taking mains outdoors.
 
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I have armoured cable going towards it; but I suppose I could run the low voltage back towards the shed in some conduit.

With regards sealing the box I'd use the appropriate IP rated glands.

Ant
 
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What glands, particularly for the ELV cable, are appropriately rated for being permanently under half a meter of water?
 

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