In general, panelboards are constructed so the run vertically for nearly the height of the panelboard.
A)branch circuits
B)receptacles
C)snap switches
D)main feed busbars

Question

Quizplus · Accepted Answer

Main feed busbars run vertically for nearly the height of panelboards as they transfer power from the main service to the branch circuits. Branch circuits, receptacles, and snap switches may be located horizontally or vertically within the panelboard, but do not necessarily run vertically for nearly the height of the panelboard.

In General, Panelboards Are Constructed So the Run Vertically for Nearly