I got Two of These...But What Are They?

[Peter W. Bennett]

After pulling the cover off of this Zinsco panel, I found these two "dough-nuts" with wires connected to them.
Never seen them before.
Does anyone know what they are?

Peter W. Bennett, Owner
www.AFullHouseInspection.com
Residential & Commercial Building Inspections
Infrared Thermal Imaging Services
530 Prospect Avenue Little Silver, NJ 07739
Office 732-758-9887 Cell 732-245-9817
NJ Home Inspector Lic#GI371
NJ DEP Radon MET11140
Certified Infrared Thermographer No.7406
Certified Energy Inspector No. 1364
Certified ASHI Member #205748
Certified Member of INACHI
Authorized United Infrared Contractor
NJInfrared.com - On Roof and Aerial Roof Surveys of Moisture
Roof-IR ~ Moisture-IR ~ Energy-IR ~ BlockWall-IR ~ Equine-IR

[Roy D. Cooke, Sr]

Current Transformers for metering

http://en.wikipedia.org/wiki/Current_transformer

[Peter W. Bennett]

thanks what are they metering?

[Michael Larson]

Originally Posted by pbennett1

thanks what are they metering?

Thy likely go to the meter to measure power consumed

[Roy D. Cooke, Sr]

Originally Posted by pbennett1

thanks what are they metering?

Services above 200 amp usually require these to read how much power has been used in the Location .

http://www.ayainstruments.com/transformertheory.html

[Stephen M. Cordio]

I've seen a few similar looking end-user products like that for homeowners to monitor their own usage. I've seen them attached to SE lines to monitor whole-house and also attached to each branch to monitor individual circuits. I had a seller show me the whole system once... it came with a software program so that he could constantly monitor usage and adjust accordingly for energy conservation.