modified 9 years ago

Drilling Holes In Concrete Walls Or Floors

00:17:12

Large Square Box is concrete wall or floor area.  Buried inside is electrical conduit or metal raceways to avoid damaging when we drill our holes.

Simple bell or lamp circuit is connected to ground at exposed metal exits at side drilling area.  Positive connection is to metal drilling (or a chisel) tool to alert driller at first contact with hidden casing before drilling damage to wires or pipes.

published 9 years ago

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