Quote:
Originally Posted by speedracing944
I am hoping to tap into some of the knowledgeable folks here. The problem we have had for the 8 years we have been in our home is the main power cables which run from the power pole to the corner of our house transmits a unbearable vibration into our bedroom. The vibration can be heard on the outside power lines as well. It creates a loud, low frequency hum which reverberates through the entire room. The vibration is more noticeable during the winter months when it is cold outside. It is to the point to where we can no longer sleep in our bedroom at night. In the past, the electric company placed dampers on the power cables which resemble giant springs. This appeared to help a little but it could have been more of a placebo affect. I once had them lessen the tension on the power cables but all this did was vary the pitch of the vibration. The cable was hanging too far down to be considered safe and was tightened up again.
I am thinking there is a natural resonance frequency of the system, sort of like a guitar spring. I am not sure what is causing the system to resonate though. The only correlation I have been able to come up with is temperature.
How do I go about eliminating this problem? I am at my wits end and my wife is talking about just selling the house.
1880's farm house
1.5 stories
Power cable is attached to the corner of the house at the eave
Speedy  |
A couple of things:
Describe the cable entrance into the house.
What is the material of the cable: Aluminum or Copper?
Hum usually is generated from the magnetic fields acting on something external. In a transformer, the steel body is excited by the alternating magnetic fields, making the classic 60 Hz hum. Is there something ferrous nearby that is being excited by the cable? Does the cable enter into the house in a "pipe"?
If it is entering the house in a "conduit" made of iron pipe, you might want to consider changing it to actual aluminum conduit, or preferably a plastic conduit. Maybe it is near some sort of drain gutter, steel support, etc. In those cases, you might consider relocating the electrical feed away from the ferrous material. Or finding and removing the ferrous material.