05-05-2018, 06:38 PM
(This post was last modified: 05-05-2018, 06:39 PM by Magenta Sunset.)
having a little LIMITED DIY. if ouy're not using Armoured (recommended), you'll need a conduit and fittings under the decking to thread the cable through. I would suggest a minimum 2.5mm T & E thickness.
as for depth, a quote from GOV regs;
Excavations and depth of underground cables
14.—(1) Every underground cable shall be kept at such depth or be otherwise protected so as to avoid, so far as is reasonably practicable, any damage or danger by reason of such uses of the land which can be reasonably expected.
(2) In addition to satisfying the requirements of paragraph (1), an underground cable containing conductors not connected with earth shall be protected, marked or otherwise indicated so as to ensure, so far as is reasonably practicable, that any person excavating the land above the cable will be given sufficient warning of its presence.
(3) The protection, marking or indication required by paragraph (2) shall be made by placing the cable in a pipe or duct or by overlaying the cable at a suitable distance with protective tiles or warning tape or by the provision of such other protective or warning device, mark or indication, or by a suitable combination of such measures, as will be likely to provide an appropriate warning.
the last one I did was dug in, in continuous conduit, was an average 18inch deep. covered with some warning tape** a few inches above the cable.
** https://www.amazon.co.uk/dp/B072595D69/r...1303108288
as for depth, a quote from GOV regs;
Excavations and depth of underground cables
14.—(1) Every underground cable shall be kept at such depth or be otherwise protected so as to avoid, so far as is reasonably practicable, any damage or danger by reason of such uses of the land which can be reasonably expected.
(2) In addition to satisfying the requirements of paragraph (1), an underground cable containing conductors not connected with earth shall be protected, marked or otherwise indicated so as to ensure, so far as is reasonably practicable, that any person excavating the land above the cable will be given sufficient warning of its presence.
(3) The protection, marking or indication required by paragraph (2) shall be made by placing the cable in a pipe or duct or by overlaying the cable at a suitable distance with protective tiles or warning tape or by the provision of such other protective or warning device, mark or indication, or by a suitable combination of such measures, as will be likely to provide an appropriate warning.
the last one I did was dug in, in continuous conduit, was an average 18inch deep. covered with some warning tape** a few inches above the cable.
** https://www.amazon.co.uk/dp/B072595D69/r...1303108288
It goes, it stops (as reqd). 
Hate Housework!
Hate Housework!