New Tesla owner here. I recently had a HPWC installed in my garage. Concern is a subtle humming noise from conduit while charging at 48 amps. Is this normal?? Details: Dedicated 60 AMP circuit running from my panel approx 100 feet to attached garage. 3 Wires (l1, l2, ground) are #6 copper and run approx 60 feet across the inside of my house (finished basement ceiling). That is the source of the noise. When the charging is stopped the noise stops, too. Conduit then turns out my home at the back, turns around side of house, and runs 40 feet in outside conduit to garage access point. Charging works fine, approx 44 mph at 48 amps as expected. Electrician has already been back to change the brakes, check all connections, and has no ideas how to silence the sound. Is the humming / vibrating / reverberating / harmonic tone to be expected from the interior conduit? Should I be worried? Is there a common fix? Thanks!