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What causes voltage to go through ground wire?
The amperage across the grounds was low (maybe 5 mA). The only thing I can think of is perhaps some of the voltage that is going back to neutral at the panel and hitting the ground cicuit there is bleeding through the ground wires and going to the cold water pipe ground. Does this make sense?
Can a ground wire be connected to another ground wire?
Some ground wires were not actually connected to ground (were not bonded to the panel ground or ground rod) and you may have been measuring phantom voltage. You would do well to remove the ground wires connecting receptacles to drain pipes and little by little install ground wires back to the panel.
How many electrical symbols are there for ground?
Figure 1: There are three different electrical symbols for ground, indicating context within a schematic. Source: Wikipedia. But ground as zero voltage is theoretical; only a conductor with zero impedance will have zero voltage. In reality, a ground plane or rail will usually have varying voltages at negligible levels.
What do chassis signal ground and earth ground mean?
All three indicate connecting to a point of (theoretically) zero voltage, but within a different context: chassis ground for a device, signal ground for very low voltage signals within a device, and earth ground for a power system. Figure 1: There are three different electrical symbols for ground, indicating context within a schematic.
What is ground voltage?
Ground is 0 Volts, by definition. If it’s anything other than 0 Volts, it ain’t ground. Voltage is always measured across two points. Ground is only 0 volts in relation to itself.
Is there no ground and there is no voltage?
But to understand what this really means, one must really understand voltage. Many people fall into the trap of thinking that since ground is \\$0V\\$, then ground is where there is no voltage. Thus, there must be voltage everywhere else. But, once you understand voltage, you see this can’t be true.
Do you need a voltage source for earth ground?
You would need connections to earth ground in two places for current to flow in and out of your circuit from earth ground. Realistically, you’d also need some kind of voltage source (a battery, or an antenna, or something) in one of those connection paths to have any sustained flow back and forth between your circuit and the earth.