Also new hook up terminations. Aluminum wire terminations start to corrode and loosen over time when exposed to the outdoors environment. Sun’s rays, heat, cold, rain, wind. All will break down a tight, clean, low impedance termination. A poor termination can and does cause excessive harmonic distortion on the mains.
I do not think that UV and heat affects aluminium, unless the global worming is higher that I believe it to be.
And there is no “clean connection” with aluminium, as the stuff naturally gets a layer of alumina on it in a hurry. The pickle it with hydrofloric acid before it is bonded… so it always has the tunneling happening…
But then again, which does, or what do, harmonics have to do with DC blocking?
So far we have two things that are not known, or shown to exist on the OPs power that need to be fixed.
It is like an SNL skit of an AA meeting with testimonial stories of what was done to fix these “problems”.
Personally I would be spending $100 on an electrician before fixing a problem that has a chance of being non-existent. There are many real problems that likely need fixing that could happen first.
I do not think that UV and heat affects aluminium,
In response to this statement of mine;
"Also new hook up terminations. Aluminum wire terminations start to corrode and loosen over time when exposed to the outdoors environment. Sun’s rays, heat, cold, rain, wind. All will break down a tight, clean, low impedance termination."
And there is no “clean connection” with aluminium, as the stuff naturally gets a layer of alumina on it in a hurry.
When the outdoors 120/240V aluminum connections are first made-up at the utility power transformer and the utility overhead lateral triplex to the electrical service weatherhead service conductors the connections are clean and tight. With the passage of time, possibly many decades of service the terminations are subject to the Sun’ UV rays, rain intrusion, snow intrusion, heat, freezing moisture in the termination, and wind. High wind can whip the heck out of the wiring terminations.
As for the sun’s UV rays it will break down the insulating, waterproofing, material(s) that was originally installed over the terminations with the passing of possibly decades of time. It also will cause the deterioration of exposed THWN insulation covering the bare conductor. I've seen it first hand.
I had major problem with transformer hum that lasted for years, this along with over voltage issue(124-126v). Never could get rid of transformer hum, bucking transformer for the over voltage. Suddenly one day I come home no more transformer hum, voltage down to 119-121v, this has remained for years now. Seems electrical grid was finally repaired.
Best regards,
Jim
Thanks @jea48 - but I can read, so I was sort of expecting something added and not a rehash of the thread.
Which parts did I get wrong? Or which parts don’t conform to your understanding?
On the SNS part, it seems like the power grid was fixed and the voltage lowered, and all that @snsdid to fix it was to come home suddenly. We don’t know if the power company had a DC offset, nor harmonics, we just know that he said that the voltage went down the same day that the hum went on walkabout.
Nor do we know that if he can home less suddenly, that the system wouldn’t still be humming.😋
(I sort of doubt that the suddenness was causal to fixing the problem.)
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