Pentair VSF pool pump trips GFI (continued)

[ddbear]

It actually does...some of the GFCI devices trip at a level below 4mA when they see high frequency leakage current. The members of the technical committee for UL 943 are working a proposal that, if passed and published, will require GFCIs to have some immunity to high frequency current. I assume the same thing happens with the 30 mA trip devices.

Your info is consistent with what I observed, and that's what I intended to say. Maybe I could have worded it better, because we are both talking about the same phenomenon.

 

[Jraef]

Updating to let everyone know that this toroid core solved the SquareD Q0 GFI tripping. It used to trip every night, but hasn't tripped anymore after adding this filter.

What we learned from this experiment:

• Needs to target a specific frequency range (FT240-43 toroid) with multiple wraps around the coil, a simple inline ferrite bead for general purpose filtering like the ones you find on the ends of USB cords is not sufficient.
• The tripping has nothing to do with the mA threshold (some have speculated maybe Siemens allows a bit more than 5mA) because a 30mA EPD breaker also trips.

There are many threads on the internet on this issue. I believe this is the first reported solution of something other than a Siemens brand GFI.

Thank you for reporting this back to us!
Now, to invest in ferrite rings...

 

[ptonsparky]

It still tripped with the test button?

 

[ddbear]

It still tripped with the test button?

Yes, test button trips it as normal, works fine.

 

[ddbear]

Reporting back for an update, after 2 months zero Square D Q0 false trips after installing the FT240-43 toroid core.