I need to cut through this concrete to lay an armoured electrical cable underneath. One edge of it abuts my house. The other side of it looks like it is about three inches thick. Should I get down on my hands and knees and chisel it in the hope that it is all three inches thick and the week of hard labour will be good for my soul or should I hire a concrete saw? Will an angle grinder be okay with the pebbles? Please advise.
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