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The number of steps in the control system shall match the number of pumps. It shall be possible to select any pump as lead, lag, or standby.

A plug arrangement for pump selection is preferred. See schematic on Drawing DG-02-9.

The pump sequence control plugs shall be located in the common pump control panel in a recessed compartment of adequate size with hinged door flush with the panel front. All wiring to the sequence control plugs shall be from terminal blocks inside the cabinet and all wiring shall be accessible from the front by opening the hinged door of the cabinet. (28-ME-DG-02 § 23.8)