Andy Lewis expressed precisely :
I wish to lay an outside electrical cable to my garden shed 30 metres from
house, what is the best sort of cable? Cheap but safe and can I bury the
cable?
Thanks......

SWA (steel wire armoured) cable and yes it can be buried. Depth depends
upon where it is to be buried or rather what is along the intended
route.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org