trenching electrical supply to planned shed/ office building

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jackg

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A planning application for a shed/office (50msq) in my garden has been made, with a view to conversion to a house in 10 years time. So want to trench new electrical supply to the electcity pole under what is the garden of my mother's old house, which is for sale and under offer. Easier now than when sold.
What size ducting is used?
I have seen twin wall in 40mm to 75mm diameter online.
And also a telecoms duct which seems to be grey and 63mm diameter.
 
Suitably sized armoured cable buried to a min of 450mm deep with warning tape on top?

*edit to correct depth
 
Last edited:
jackg said:
What size ducting is used?
Click to expand...
Minimum is 32mm for short lengths of single phase cable.
Minimum 450mm depth.

However larger is preferable and required for longer lengths, so suggest at least 50mm, and a depth of 600mm would be better if it's under a garden where digging is likely.
Route must be accurately recorded, be as straight as possible, duct must be surrounded by 75mm of fine sand on all sides and above, yellow/black warning tape placed 75mm above the ducting before filling the trench.
Both ends of the duct must be sealed to prevent debris entering, and a draw rope must be installed in the ducting.
Take multiple photos during the installation including some with a rule to show the depth.
 
Are you suggesting that this ducting will go underground through an area of garden being sold to a 3rd party?
 
jackg said:
A planning application for a shed/office (50msq) in my garden has been made, with a view to conversion to a house in 10 years time. So want to trench new electrical supply to the electcity pole under what is the garden of my mother's old house, which is for sale and under offer. Easier now than when sold.
What size ducting is used?
I have seen twin wall in 40mm to 75mm diameter online.
And also a telecoms duct which seems to be grey and 63mm diameter.
Click to expand...
Probably easier now but get your solicitors to reserve access rights to lay and maintain relevant services over the land sold
 
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