Robert has obviously never used a walk-behind trencher (or been involved in laying low voltage cable). I have several Provincial Government related contracts that require both (trenching and the laying of low voltage cable). I have on more than one occasion wound up coming up against services less than the required depth specified by both the engineer on the job, and applicable codes. In those instances were the run hasn't been compromised, we usually wind up with an "extra" to rectify the problem. Sometimes it's not even the original contractor's fault. What often happens is that the area is "re-graded" to aid drainage or because it's been made "bigger" (more space needed). There are any number of reasons why a service could suddenly be less than the required depth (and I haven't even broached the subject of incompetent installation). Remember whom you're dealing with when responding to Robert. He has no "real world" experience to draw upon. As has been demonstrated here, he also doesn't really "plonk" anyone. He reads everything posted in this Group and will "pounce" when he sees an opportunity to denigrate someone actually *in the trade*.
Frank Olson