Answer
Wiring and Cabling
Three wiring schematics are available—3+1, 2+2, and three circuits with separate neutrals (3SN). All the components in an electrical distribution system must use the same wiring schematic. For safety the components are keyed, labeled, and color-coded to make it impossible to connect mismatched parts.
Local electrical codes vary. Consult a qualified electrical contractor or engineer for the proper installation of all electrical components.
Detailed Specs for Electrician
Panel segments with big open base cannot use base power infeed. Bring power in using a multipurpose infeed. Base Power In
Connector on base power infeed must be placed behind panel base trim and harness must be backfed through base trim opening prior to an electrician making the connection to power in the building floor.