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Old 01-31-2017, 11:07 AM   #21
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When power is interrupted to a magnetic field the collapsing magnetic field will generate a large counter EMF voltage, otherwise known as a spike. Since the circuit is now open the voltage produced can be quite high albeit just for a fraction of a second. The surge suppressor conducts at the increased voltage and limits(clamps) the surge.

Turning off the switch to the shaded pole motor in the bath fan causes a voltage spike. Same thing with the furnace split phase motor. Arcing at the switch or furnace relay can also produce RF spikes which can cause interference with sensitive electronics. Intensity is variable so that's why effects are random.
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Old 01-31-2017, 03:08 PM   #22
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The question is, is it poorly designed piece of equipment or a real problem. Seen something similiar with GFCI receptacles tripping when the fluorescent over the sink light is turned off.
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Old 02-11-2017, 07:46 PM   #23
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Quote:
Originally Posted by FaultCurrent View Post
When power is interrupted to a magnetic field the collapsing magnetic field will generate a large counter EMF voltage, otherwise known as a spike. Since the circuit is now open the voltage produced can be quite high albeit just for a fraction of a second. The surge suppressor conducts at the increased voltage and limits(clamps) the surge.

Turning off the switch to the shaded pole motor in the bath fan causes a voltage spike. Same thing with the furnace split phase motor. Arcing at the switch or furnace relay can also produce RF spikes which can cause interference with sensitive electronics. Intensity is variable so that's why effects are random.
Thanks, do you think adding a ferrite to the usb cable will eliminate the problem?
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Old 02-11-2017, 08:02 PM   #24
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I'd bet on a poor neutral connection. Do you have any issues with lights dimming or getting brighter? You need to check the voltage at the hub when the failure occurs. Is it fed from a MWBS?

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Old 02-11-2017, 08:50 PM   #25
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I'd bet on a poor neutral connection. Do you have any issues with lights dimming or getting brighter? You need to check the voltage at the hub when the failure occurs. Is it fed from a MWBS?

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Thanks. I removed the hub from the usb cable and the problem still persists so the hub is not the issue. It has to be the usb cable being affected by RF interference from the two motor loads so I am hoping adding ferrites to the cable will help. The hub circuit, bathroom fan circuit, and furnace fan circuit are all on different breakers.
Strangely enough, the main floor powder room fan does not cause this issue.
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Old 03-17-2017, 11:13 PM   #26
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I'm still having this problem and it's driving me crazy

I pinpointed the problem to the following:
When I operate my bathroom fan (mainly when I turn it OFF), when my refrigerator compressor kicks on, and also when my furnace motor turns on, I lose power to the USB cable. The cable regains power after a few seconds though but it's still annoying.

So this obviously caused by any motor loads.What could be causing this? Does anything exist that will prevent interference on this cable like some sort of shielded wrap?

I know this is not exactly electrical related so can anyone here suggest another forum that may give me better insight on this issue?
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Old 03-18-2017, 12:21 AM   #27
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This is a total stab in the dark but try putting the USB load on the other phase in the panel.

I'd be surprised if it works but at this point.........lol.
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Old 03-18-2017, 12:36 AM   #28
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This is a total stab in the dark but try putting the USB load on the other phase in the panel.

I'd be surprised if it works but at this point.........lol.
This is about the only thing I haven't tried yet. I hope that works. If it does work, that's not necessarily a good thing is it?
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