| ??? 05/17/12 03:31 Read: times |
#187387 - ground fault Responding to: ???'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 | 01/01/70 00:00 | |
| who know | 01/01/70 00:00 | |
| 3 hooters? | 01/01/70 00:00 | |
| I was thinking more of this | 01/01/70 00:00 | |
| with a slight twist | 01/01/70 00:00 | |
| ground fault | 01/01/70 00:00 | |
| actually | 01/01/70 00:00 | |
| how do you distinguish? | 01/01/70 00:00 | |
| ground fault | 01/01/70 00:00 | |
ground fault | 01/01/70 00:00 | |
| Thanks Joseph Hebert | 01/01/70 00:00 |