Abstract: The present disclosure provides a branch circuit monitoring (BCM) system that may include a first collector board with a first plurality of connector ports connected to a first plurality of branch circuits, and a second collector board with a second plurality of connector ports connected to a second plurality of branch circuits. Each of the first and second plurality of connector ports may receive a respective first and second plurality of connector plugs configured to be receivable in the respective first and second plurality connector ports. The first collector board may be coupled to an aggregator board such that the first plurality of current sensors may report branch circuit measurements to the aggregator board. The plugs may be connected to associated leads connected to respective first plurality and second plurality of current sensors. The first board and the second board may be in communication using a bus protocol.