Timeline for Why aren't GFCI and AFCI breakers combined or used together?
Current License: CC BY-SA 3.0
11 events
| when toggle format | what | by | license | comment | |
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| Jan 18, 2020 at 15:18 | comment | added | GB - AE7OO | @Joshua I don't see what part the analog ground pins of the transceiver play here. There should be no place in the power supply that would connect device ground to neutral. With a 2 prong supply the only connections between the input and output are either optical, capacitive or inductive, none of which will pass DC. With a 3 prong, you would still have no connection to neutral(outside the bonding at the service connection). And on the other side, please go look at electronics.stackexchange.com/questions/27756/… . | |
| Oct 18, 2018 at 1:37 | comment | added | Joshua | See here. Pins 3 and 9 are grounded. i.sstatic.net/l4uSB.png | |
| Oct 18, 2018 at 1:30 | comment | added | ThreePhaseEel | @Joshua -- the Ethernet wires themselves should be floating anyway due to the Ethernet magnetics... | |
| Oct 18, 2018 at 1:24 | comment | added | Joshua | I guarantee you the case isn't floating. That would risk putting too much current down the Ethernet wires. | |
| Oct 18, 2018 at 1:23 | comment | added | ThreePhaseEel | ...that doesn't really make sense -- it may be connected to DC -, but that's isolated from neutral by the power supply | |
| Oct 18, 2018 at 1:18 | comment | added | Joshua | @ThreePhaseEel: It's the connection sense wire in the Ethernet port. It's wired straight to ground, only the device only has two power wires so the ground is really the neutral. Every single Ethernet device I've looked at has this property of wiring the connection sense to ground; ergo every two power wire device that uses Ethernet dumps DC to neutral. | |
| Oct 18, 2018 at 1:12 | comment | added | ThreePhaseEel | @Joshua -- you have a really weird cable modem if it's injecting DC onto the neutral, dude. what make and model do you have? | |
| Oct 18, 2018 at 0:49 | comment | added | Joshua | @ThreePhaseEel: I have discovered that AFCI is incompatible with Ethernet due to the AFCI trying to provide GFCE which Ethernet does not tolerate. Check the schematics of cable modems. They dump DC power onto the neutral line that originated from another circuit altogether. | |
| Dec 31, 2016 at 23:57 | comment | added | ThreePhaseEel | @PhilPDX -- a properly functioning fridge shouldn't leak current to ground outside the UL limits (which are at the sub-milliamp level). That gives me an idea though...also, your question re: AFCIs and fridges is a good one that merits a question of its own (post it as a full question and I'll toss you an upvote bone) | |
| Dec 31, 2016 at 22:47 | comment | added | PhilPDX | NEC requires AFCI protection for refrigerators. I have read much about not putting refrigerators on a GFCI breaker, due to the risk of food spoilage with nuisance tripping. Are AFCI's less likely to nuisance-trip a refrigerator circuit? And if so, is it because the ground current threshold for tripping a GFCI breaker is 4-6mA, as opposed to 30mA for an AFCI breaker? | |
| Nov 19, 2016 at 3:22 | history | answered | ThreePhaseEel | CC BY-SA 3.0 |
