Modular Electrical Panelboard

A spine of a chassis, the spine comprising:

• a back panel;
• two bus bars spaced apart from each other and fixed to the back panel, each bus bar including holes along a length of the bus bar and aligned with holes on the other bus bar, a set of aligned holes configured to receive bolts that hold a chassis module in physical contact to the bus bars;
• and
• a wall raised from a first edge of the panel and extending along the first edge, the wall including cavities spaced along the length of the wall and at locations relative to holes of the bus bars.

A spine of a chassis, the spine comprising:

• a back panel;
• a side wall extending from an edge of the back panel;
• two bus bars that are spaced apart from each other, fixed to the back panel, and run parallel to the side wall;
• and
• guiding structures extending from the side wall, the guiding structures defining receiving compartments for attaching chassis modules across the two bus bars,
• wherein the receiving compartments are configured for field installation of the chassis modules and for each receiving compartment:
• the two bus bars contain a hole pattern for attachment of the chassis module to the two bus bars, and the side wall includes an opening to pass an electrical connection that provides data to the chassis module.