Patent ID: 8254089

Claim:
An electrical panelboard enclosure, comprising: an enclosure housing having a front, a back, first and second sides, a top, a bottom, an opening in said front, and an interior equipment chamber accessible via said front opening; a service entrance door pivotally mounted on said housing and positionable between a closed position wherein said front opening is covered and an open position wherein said front opening is exposed; a primary service panel in said equipment chamber configured to receive power from a main power source and an alternate power source; a main power source wireway in said equipment chamber arranged for routing main power source wiring to deliver main power from said main power source to said primary service panel; an alternate power source connector array in said equipment chamber accessible from outside said enclosure housing and configured to detachably connect to alternate power source cables; an alternate power source wireway in said equipment chamber arranged for routing alternate power source wiring; alternate power source wiring disposed in said alternate power source wireway and interconnecting said alternate power source connector array and said primary service panel; a distribution panel in said equipment chamber operable to selectively receive said main or alternate power from said primary service panel and distribute said power to one or more subsidiary load circuits; a service transfer switch unit associated with said primary service panel, said service transfer switch unit being operable to selectively delivery said main power and said alternate power to said distribution panel; a main power breaker in said service transfer switch unit having a main power breaker toggle switch operable to selectively activate and deactivate said main power to said distribution panel; an alternate power breaker in said service transfer switch unit having an alternate power breaker toggle switch operable to selectively activate and deactivate said alternate power to said distribution panel; an interlock in said service transfer switch operable to prevent simultaneous activation or deactivation of both said main power breaker toggle switch and said alternate power breaker toggle switch; and an arrangement in which said primary service panel, said distribution panel, said alternate power source connector array, said alternate power source wiring and said service transfer switch are part of an installable panelboard assembly that is mountable as a unit within said exterior enclosure.