Depends on the code where you live. In reality, if practical all grounds should be bonded together> Rationale: The potential from a lightening strike between two separate grounds can be twice as great as one ground. The distance between grounds greater than a few feet away however is not practical. The size of the bond (wire) between them will have to be too large to be practical in order to reduce the resistance to prevent excess current through the bond. Example Telephone, TV, and power entrances should be adjacent to one another and all bonded to a single ground rod. If it is on the order of 20' away for example a # 2 AWG copper wire would be required between the two grounds. Of course two different power sources would be no different.
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Today's Featured Article - Tractor Profile: Case VA Series - by Staff. V, VC, VI and VO). Althouh the Case VA looked much like the V, it shared no major components with its predecessor. Except for military units, the production of the Case VA was interrupted in July of 1942 due to World War II. It resumed again in 1944 and continued until 1953. It started up briefly later on in 1953 and continued on a very limited basis until 1956. The VA Series included the following models: VA: Fixed front wheel tread VAC:
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