A device is provided for monitoring a plurality of appliances, wherein each appliance is connected to an electrical circuit having a first wire and a second wire. The device includes a plurality of cores, each of the plurality of cores being constructed to be able to surround one of the first wires of...http://www.google.de/patents/US20040244390?utm_source=gb-gplus-sharePatent US20040244390 - System and method for remote appliance monitoring
