- Location
- Bremerton, Washington
I received a question on the following:
"For a ground rod with 10 ohms to ground. If the zero ohm point is considered to be the neutral conductor then the current path is from the ungrounded conductor through the 10 ohms to earth, then up through the 25 ohm to neutral as they are bonded in main panel. The total resistance is then 35 ohms as they are considered to be in series. The current is then 3.43 amps. If earth is considered to be the zero ohm point then the 10 ohm and the 25 ohm ground are in parallel. This makes the unknown ground rod have a 16.67 ohms on it's own. The ungrounded conductor would then draw 7.2 amps. It looks like I need to know where zero ohms is located. I want to use this in class when I,m trying to explain grounding but need more clarification. Thanks again for your help."
"For a ground rod with 10 ohms to ground. If the zero ohm point is considered to be the neutral conductor then the current path is from the ungrounded conductor through the 10 ohms to earth, then up through the 25 ohm to neutral as they are bonded in main panel. The total resistance is then 35 ohms as they are considered to be in series. The current is then 3.43 amps. If earth is considered to be the zero ohm point then the 10 ohm and the 25 ohm ground are in parallel. This makes the unknown ground rod have a 16.67 ohms on it's own. The ungrounded conductor would then draw 7.2 amps. It looks like I need to know where zero ohms is located. I want to use this in class when I,m trying to explain grounding but need more clarification. Thanks again for your help."