| Andy Peters 05/16/12 21:31 Read: 140 times Tucson, Az USA |
#187387 - ground fault Responding to: Joseph Hebert's previous message |
Joseph Hebert said:
Hi Erik,
I'm guessing then that you distinguish a short from a leak based on the impedance to ground? Or just the resistive component? At how many ohms does a short become a leak? I think of a high impedance short, not a high impedance leak, and so I don't worry about the qualitative distinction. "Ground fault" is somewhat of a misnomer. The usual GFI circuit looks at the currents in the hot and the neutral, and if they are not equal (which is what you expect, the neutral of course is the return for the hot), the circuit assumes that the current is going elsewhere which is bad, and it trips. This is why a GFI works, even when the grounded conductor is absent or defeated. -a |
| Topic | Author | Date |
| Ground Fault | Arif Deshmukh | 05/15/12 09:12 |
| who know | Erik Malund | 05/15/12 09:23 |
| 3 hooters? | Per Westermark | 05/15/12 09:28 |
| I was thinking more of this | Jez Smith | 05/15/12 11:50 |
| with a slight twist | Erik Malund | 05/15/12 12:18 |
| ground fault | Joseph Hebert | 05/15/12 15:28 |
| actually | Erik Malund | 05/16/12 06:36 |
| how do you distinguish? | Joseph Hebert | 05/16/12 21:10 |
| ground fault | Andy Peters | 05/16/12 21:31 |
ground fault | Joseph Hebert | 05/17/12 07:24 |
| Thanks Joseph Hebert | Arif Deshmukh | 05/16/12 23:52 |