Abstract: A networked lighting control device may include a switching device to control power to a load, a communication interface to couple the relay module to a control module at the relay panel, revenue-grade metering circuitry to monitor power flowing to the load, and a controller to control the switching device in response to inputs received at the communication interface and to transmit metrology data to the control module. A control module may include a mounting interface to mount the control module to a relay panel, a first communication port to receive first control inputs using a first protocol, a second communication port to receive second control inputs using a second protocol, a third communication port to control one or more relay modules mounted to the relay panel using the local communication format, and logic to translate the first and second control inputs to the local communication format.

Abstract: A captive panel fastener is manufactured by first overmolding a plastic cap around the head of a screw, the cap having a cylindrical plastic skirt extending downwardly beyond the base of the screw head and formed with a circular opening at the bottom. After a compression spring is placed around the shank of the screw, the screw is pressed against a top surface of a ferrule to a point where the capped-skirt extends downwardly below a ferrule flange. At that point, heat and pressure are applied radially inwardly around the periphery of the plastic skirt along its bottom edge until it is permanently deformed to a point where the bottom of the skirt is smaller in diameter than the ferrule flange. The screw is thereby captivated to the ferrule between extended and retracted positions.

Abstract: A captive panel fastener is manufactured by first overmolding a plastic cap around the head of a screw, the cap having a cylindrical plastic skirt extending downwardly beyond the base of the screw head and formed with a circular opening at the bottom. After a compression spring is placed around the shank of the screw, the screw is pressed against a top surface of a ferrule to a point where the capped-skirt extends downwardly below a ferrule flange. At that point, heat and pressure are applied radially inwardly around the periphery of the plastic skirt along its bottom edge until it is permanently deformed to a point where the bottom of the skirt is smaller in diameter than the ferrule flange. The screw is thereby captivated to the ferrule between extended and retracted positions.

Abstract: A power monitoring system with multiple sensors for electrical panels providing power through multiple electrical conductors. The power monitoring system preferably includes at least four sensors supported in a fixed spatial relationship on a support. The sensors include openings through which electrical conductors may be extended.

Abstract: A power monitoring system for electrical panels providing power, received from one or more power sources, to multiple current conductors. The power monitoring system preferably includes a plurality of sensors affixed to a support. A portion of each sensor defines an opening through which a current conductor may be extended.

Abstract: Separable toroidal segments reduce the size of a sensing transformer that can be installed on an electrical conductor while connected to a device.

Abstract: A power monitoring system with multiple current sensors.

Abstract: A power monitoring system for electrical panels providing multi-phase power, with multiple current sensors. The disclosed power monitoring system preferably determines the instantaneous power provided to each of multiple loads by sensing the potential and phase of each conductor that supplies power to one or more of the respective loads.

Abstract: Data is acquired by a data acquisition unit and wirelessly transmitted to a data transfer device that wirelessly retransmits the data to a data processing device.

Abstract: A modular metering system comprises a data processing module, a current module and a voltage module. The current and voltage modules include sensor memories characterizing the respective current and voltage sensors facilitating assembly and repair of the metering system.

Abstract: A power monitoring system comprising a first current sensor suitable to sense first changing electrical current within a first conductor to a first load and a first conductor. A second conductor sensing a first voltage potential provided to the first load. A power monitor superimposes a first signal on the first conductor and first current sensor such that the first signal is sensed on the other of the first conductor and first current sensor. Associating the first voltage potential with first changing electrical current in the power usage calculation of the first load.

Abstract: The computational resources of a digital power meter can be reduced by utilizing an interrupt requested in anticipation of interrupt latency to perform real-time tasks, an approximation of a root mean square load current at an earlier time to compensate for a phase shift between the load current and the current transducer output, and an amplitude that is neither zero nor maximum to distinguish the cycles of a harmonically distorted waveform.

Abstract: An interrupt request is asserted in anticipation of a period of latency preceding preparedness of a power meter data processing device to sample a voltage or current enabling the use an interrupt to control the data processing device's performance of real-time sampling in combination with other tasks related to the power meter's operation.

Abstract: The data storage and processing resources required for an electric meter are reduced by basing the selection and application of phase error correction on a root mean square load current flowing through the meter.

Abstract: An improved sensor for a power monitor comprises an array of split core current sensors that can be installed without disconnecting the wiring to the circuit breakers of an electrical panel and a voltage tap connectable to an electrical panel bus bar.

Abstract: An electricity metering method and apparatus is provided for determining the phase of first waveform relative to a harmonically distorted, second waveform having cycles temporally distinguished by an occurrence of an amplitude that is neither zero amplitude nor a maximum amplitude of said waveform.

Abstract: A phase determination system for power measurement.

Abstract: Separable toroidal segments reduce the size of a sensing transformer that can be installed on an electrical conductor while connected to a device.

Abstract: A power monitoring system with multiple current sensors.