What does this do and why is it there?

[FionaZuppa]

Thank you all for your help on this. I love this site and forum because it constantly teaches me something new making me a better electrician

you made an interesting statement.

i have see the division, those who just wire-&-go, and those who wish to understand other things around the wire-&-go practice. the latter is becoming more rare.


how many electricians actually understand the cause-and-affect of ringwave spikes due to old cap switching banks (IEEE C3 or B3 ringwave)? this too can play games with gfi's downstream hanging off of 1ph step-down xfmer. if you have time this is a good read (http://www.ewh.ieee.org/soc/pes/switchgear/minutes/2007-2/F07ADSCOMa12.pdf)

 

[al hildenbrand]

The fan is a panasonic model #FV-11-15VK1

the noise produced by the, probably cheaply made fan unit, can get onto EGC and may play games with A/Gfi recepts or ocpd's

Now, that makes sense to me. The three turns of the EGC in the ferrite core will help to impede the sudden changes in current, thereby reducing the high frequency components in the "signal" that will be seen by the AFCI signal processor.