power management module 524 the power management module 524 is coupled to a microcontroller 528 the sensor interface 520 and the extra pin interface 522 are coupled to the microcontroller 528 the ct concentrator 124 also includes a transceiver 530 coupled between the digital interface 125 and the microcontroller 528 and a non volatile memory module 532 coupled to the microcontroller 528 in one embodiment the non volatile memory module 532 includes electrically erasable programmable read only memory eeprom however in other embodiments the non volatile memory module 532 may include any type of non volatile memory e g such as serial flash memory the ct concentrator 124 also includes a user interface 534 coupled to the microcontroller in some embodiments the user interface may include any type of controls which allows a user to interface with the ct concentrator 124 e g such controls include switches buttons led 39 s etc according to one embodiment the ct concentrator 124 also includes a usb port 536 and a serial port 538 the ct concentrator 124 also includes a wireless radio module and antenna 540 in one embodiment the wireless radio module is a zigbee radio however in other embodiments the wireless radio module 540 may be configured using a different wireless standard according to one embodiment the wireless radio and antenna 540 is coupled to the microcontroller 528 an on off switch 542 and a serial memory module 544 the power module 126 receives ac power from a power source e g a single phase or three phase power source not shown modulates and converts the received ac power to dc power and provides dc power to the ct concentrator 124 via the dc interface 506 and.