Mains Power Cable Depth

Mains cable for urban or suburban installations with cable runs up to 50 metres is often single core 16 mm 2 neutral screen or three core 16 mm 2 neutral screen.

Mains power cable depth.

Of nominal diameter 115 mm or less the minimum depth to the top of the external surface of but exclude power cables watermains and gas mains involving a maximum of two cable ducts ii for non energised underground services which include telecommunication cables laid in ducts cycle track verge side lane and back lane will be counted and. Outside diameter is 125mm. Minimum excavation depth required a minimum depth duct cable size c 75mm of sand bedding please note that m represents the cable marker tile for 33kv. Direct cable burial uf cable underground feeder cable is specially designed and manufactured with properties that make it ideal for burial.

These depth reductions apply no matter which burial method is chosen. Conduits are required for installation in 2 inches of solid rock with concrete. Polypipe rigiduct outside diameter is 38mm. All cables and ducts for lv mains and 11kv circuits are to be installed by central networks or its agents.

This is available from our approved suppliers. At 18 inches you can use thwn 2 conductors inside a continuous length of pvc conduit which protects the wire all the way through the trench to the house. Mains cable for rural installations and cable runs up to 200 metres is 95 mm 2 four core aluminium with high impact sheathing. To be used for single phase service cables only.

A depth of 240mm below gardens and paths 100mm below roads and 650mm below agricultural land. Under a driveway you may only need 12 inches of burial depth. There are no statutory depths for underground cables as ground levels may have changed since the original installation and without the knowledge of the cable owner. The generally applicable depth is 12 inches or you can reduce it to 6 inches if you protect the cables with 2 inches of concrete.

At 24 inches you can bury underground feeder cable using pvc conduit to 18 inches below ground only where the wire comes up. The cable is less likely to be cut or disturbed by typical digging if it is this far below ground.