Originally Posted by hdtvluvr
So can connecting to a 3-wire receptacle be a permanent solution? Getting to a water pipe will be just as difficult as getting to a ground rod outside excluding bonding it to the main house ground.
Well, it's not ideal, but it's adequate for the LTE test if the receptacle is properly wired. Each receptacle of a surge suppressor strip connected to a 3-wire receptacle is grounded that way.
There is another reason why I think it is a good idea to ground the coax shield with a grounding block connected to the house electrical system ground, even with an indoor antenna. I have had three close calls with electrical shock, so I bought a leakage current tester to check AC operated equipment.
Your antenna coax is connected to AC operated equipment. All AC operated equipment has leakage current, even when operating properly. You can't feel it because it is below your threshold of perception. If the AC operated equipment becomes defective, the leakage current can increase and go through your body, creating a shock hazard.
Most TVs only have a two-wire power plug, so their antenna connector outer thread isn't grounded. I had a Samsung TV that had a 3-wire plug because it could be used as a computer monitor. If you connect the coax shield to a grounding block that is connected to the grounding pin of a plug that is inserted in a properly wired 3-wire receptacle, that would be equivalent to a 3-wire plug on the TV for testing.
If I calibrate a piece of equipment to be used by someone else, I also check it for leakage current.
Initially, in the above temporary setup, the antenna coax shield was not grounded. During testing, when I touched the coax shield and the grounded metal strip at the front edge of the counter, I felt a mild shock. The voltage on the coax was about 40 volts AC. When I investigated further, I discovered that the individual leakage currents of each piece of equipment were added together when all the equipment was connected together; the total leakage current was about 200 µA (microamperes). The individual equipment leakage currents were within safe limits as was the total leakage current, but the shock got my attention. When I grounded the coax, the leakage current went to zero and there was no longer any voltage on the coax shield.
A case history:
Getting A/C voltage on converter box's antenna input !
Equipment Leakage Current
What is "the same potential as the tuner"? Does that mean the same outlet?
When two pieces of equipment, a piece of equipment and ground, or two grounds are at the same potential, it means there is no difference in voltage between them to shock you.
You will also find the term "difference of potential" used when considering grounding the antenna mast. If you use a separate grounding rod to ground an antenna mast, the code requires that the grounding rod be connected (bonded) to the house electrical system ground with 6 gauge (expensive) copper wire so that there is no difference of potential between the two grounds.