Digging channel in concrete in garden; route over drains?

Joined
9 Apr 2010
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Cheshire
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This image shows my mother's garden. The yellow demarcation represents the deck. The black demarcation represents the boundaries of the building. The red circle represents a drain access cover and the brown square a drain (and gutter pipe). The lightning symbols represent electrical connections and the dotted line represents the channel which I propose to dig in the concrete to contain an electrical cable.

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It appears likely that the channel will cross over the drains. Do I risk damaging the drains by using an angle grinder with diamond stone disc and then a rotary hammer with chisel to cut the channel? Should I instead lead the cable anticlockwise around the deck and make a much shorter channel at the very bottom of the garden/image?
 
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I've modified the image to propose two possible alternative routes for the cable which I guess would not require a channel in the areas directly above the drains.

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