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Equi=Core Hum & Other Issues

I’ve owned a Core Power Tech Equi=Core 1800 for 6 months. Recently the transformer has started to hum inside the chassis. It happens when components are on and also when sources are powered down. The transformer hum is intermittent. It ranges from multiple times per day to 3 or 4 days without any hum. I never had DC on my dedicated lines before, so I picked up a Klein Tools AC/DC tester... https://www.kleintools.com/catalog/electrical-testers/electronic-acdc-voltage-tester-12-240v-ac-15-2...
and when plugged into wall receptacles it indicated overload. Line voltage is steady at 122VAC and always has been.
What am I doing wrong, and how should I test for DC on the power line?

I discovered another problem when testing the Equi=Core duplex receptacles; they indicate inverted polarity. All house outlets measure correct polarity.
I’m looking for some assistance in diagnosing this hum. I’m not sure if it’s due to DC offset or if the torroid itself is vibrating in its mounting.

I know this is becoming a long thread, but I must mention that the Equi=Core now trips the breaker at the panel when powered on. It trips several times in a row, eventually allowing power-up. This is a 20A dedicated line from a subpanel which I’ve had for years.
Any advice is much appreciated.


128x128lowrider57
lowrider57's avatar
lowrider57 OP
5,417 posts
 
 @uberwaltz , power company owns only the meter. Homeowner is responsible for service drop and wiring to the meter box. That means I own the box, they own the meter.

Things have changed a lot for homeowners in this city.
Philly also decided they're no longer responsible for trees in front of house on city property. We have to pay for pruning or removal. I could go on.
Some work requires permits like roofing and an addition to house.

lowrider57's avatar
lowrider57 OP
5,417 posts
 
JEA is responsible for everything from the incoming side of my breaker box.
Upkeep and any work required unless I was somehow to deliberately damage something.

At least the gas company is still responsible for all lines outside and inside. Homeowner's responsibility is for the appliances unless purchased from the gas company, eg, hot water heater.
I think this may be universal.



lowrider57's avatar
lowrider57 OP
5,417 posts
 
I really appreciate your interest and advise @jea48 .


lowrider57's avatar
lowrider57 OP
5,417 posts
 
I have an electrician coming next week to install a new service drop, 30' cable, meter lid, and the service cable to a new 100A panel. He's included cost for permits and inspection by city agency.
$1900.

And he'll tie in to my subpanel.
He talked about eliminating harmonic distortion, so I think I found the right guy.


jea48
4,484 posts
 
New service drop.
New meter socket.
New service entrance conduit and wire from meter socket to a new electrical panel.
(Including breakers). 
System grounding up date as needed.   
Electrical permit.

$1900..... That’s a good price.


Jim

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