The only thing that comes to mind, is that perhaps your cable company guy might have been concerned with, was the possibility of creating a "ground loop", which can become a problem because of a difference in potentials if not properly bonded, and HE stands an excellent chance of creating himself. It happens, and any one worth half of his or her own salt will not deny it. That being said, I don't know if that is what they were suggesting, but that is what comes to mind. As for using your conduits as a ground, that is not a preferred method, but can be a ground IF your conduits are tied together all the way back to your breaker panal, with the bare metal of the conduit in theory touching the bare metal of the panal where they meet, which no doubt has ground tied to it (panal). Again, that is not the preferred method because it depends upon a whole lot of "ifs" and quality metal used, for instance in the made in china conduit that most are using today anyway. That being said, and not knowing if your conduit is grounded or not, no one should ever assume that it is. Conduit generally makes a lousy ground and for obvious reasons, should be avoided. For electronic equipment, I will NOT share a ground with anyone, and generally run my own where possible, or use building structure steel where not. Other than through the power cord, I don't use electrical or telco ground, not will I ever use a conduit. I run my own.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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