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A power transfer device adapted for interconnection with the electrical system of a building includes a housing that includes a base having a back wall and an intermediate member that engages the base. A first housing section engages the base and the intermediate member and defines a first interior

A power transfer device adapted for interconnection with the electrical system of a building includes a housing that includes a base having a back wall and an intermediate member that engages the base. A first housing section engages the base and the intermediate member and defines a first interior portion. A second housing section engages the base and the intermediate member and cooperates with the base to define a second interior portion. Fasteners secure the intermediate member, the first housing section and the second housing section together. Power transfer switching components are interconnected with and carried by one of the housing sections. A cover may be pivotably mounted to the housing. During assembly, the power switching components are mounted to one of the housing sections to form a subassembly that is connected to the base as a single unit.

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1. A power transfer arrangement for supplying power from an auxiliary power source to an electrical system of a building, the arrangement comprising: a base having a back wall adapted to be mounted to a mounting structure; anda subassembly removably attached to the base as a single structure, the su

1. A power transfer arrangement for supplying power from an auxiliary power source to an electrical system of a building, the arrangement comprising: a base having a back wall adapted to be mounted to a mounting structure; anda subassembly removably attached to the base as a single structure, the subassembly comprising one or more walls that engage the base and that cooperate with the base to define an enclosed interior cavity, and a plurality of power switching components mounted to and carried by the one or more walls, wherein the plurality of power switching components are secured within openings in the one or more walls and are configured and arranged for connection to lead wires in the enclosed interior cavity, and wherein the plurality of power switching components are separately mounted to one or more of the walls of the subassembly and are accessible from an exterior defined by the panel arrangement and the base. 2. The power transfer arrangement of claim 1 wherein the plurality of power switching components comprise one or more of a switch, a circuit breaker, and a power meter. 3. The power transfer arrangement of claim 2 wherein the plurality of power switching components further comprises a light bar that provides surface illumination for the subassembly when the auxiliary power source is feeding electrical power to the electrical system of the building. 4. The power transfer arrangement of claim 1 wherein the plurality of power switching components are spaced from the back wall when the one or more walls of the subassembly are secured to the base. 5. The power transfer arrangement of claim 1 further comprising an intermediate member that engages the base and that defines first and second areas of the base on opposite sides of the intermediate member and engagement structure associated with the base, the subassembly, and the intermediate member for engaging the base, the intermediate member, and the subassembly together. 6. The power transfer arrangement of claim 5 wherein the intermediate member segments the interior cavity into a first compartment and a second compartment, and wherein the subassembly engages the first area of the base and the intermediate member to cover the first compartment, and further comprising a panel that engages the second area of the base and the intermediate member to cover the second compartment. 7. The power transfer arrangement of claim 6 further comprising an opening between the first and the second compartments that allows passage of a least one wire between the first and the second compartments. 8. The power transfer arrangement of claim 7 wherein the opening is formed in the intermediate member. 9. The power transfer arrangement of claim 8 further comprising a strain relief member movably mounted to the intermediate member and generally aligned with the opening, wherein the strain relief member is operable to hold one or more lead wires against the back wall of the base. 10. The power transfer arrangement of claim 5 wherein the base includes a pair of sidewalls that extend from the back wall and wherein the intermediate member is removably secured in a groove formed in the pair of sidewalls and the back wall. 11. The power transfer arrangement of claim 1 further comprising a cover removably coupled to the subassembly. 12. A transfer switch arrangement comprising: a cabinet having a base and a panel cooperatively defining a wiring cavity when the base and the panel are connected together;a plurality of power transfer switching components mounted within openings in the panel and carried by the panel and configured to be connected to wires enclosed in the wiring cavity, wherein the plurality of power transfer switching components are mounted on an outwardly accessible surface defined by the panel; andfasteners attaching the panel, with the plurality of power transfer switching components mounted thereon, to the base. 13. The transfer switch arrangement of claim 12 wherein the cabinet further includes an intermediate member separate from the panel and removably coupled to the base, the intermediate member defining a lower end of the wiring cavity and the panel having an upper portion defining an upper end of the wiring cavity. 14. The transfer switch arrangement of claim 13 wherein the base has an inner surface with a groove formed therein, and wherein the intermediate member is configured to be slidably received in the groove. 15. The transfer switch arrangement of claim 14 wherein the fasteners further attach the intermediate member to the base. 16. The transfer switch arrangement of claim 13 wherein the intermediate member defines the lower end of the first-mentioned wiring cavity and defines an upper end of a second wiring cavity, and further comprising another panel attachable to the base to close the second wiring cavity. 17. The transfer switch arrangement of claim 16 wherein the intermediate member includes an opening for passing wires between the first-mentioned and the second-mentioned wiring cavities, and further comprising a strain relief member movably mounted to the base and generally aligned with the opening, wherein the strain relief member is operable to hold one or more lead wires against the back wall of the base. 18. A method of assembling a transfer switch arrangement, the method comprising: providing a base adapted to be mounted to a mounting structure;providing a panel arrangement having a plurality of openings,mounting a plurality of separately mountable power transfer switching components within the openings of the panel arrangement; and thensecuring the panel arrangement to the base, wherein the panel arrangement and the base cooperate to define an interior cavity, and wherein the power transfer switching components are accessible from an exterior defined by the panel arrangement and the base. 19. The method of claim 18 further comprising connecting the plurality of power transfer switching components to one or more lead wires, wherein said connecting precedes securing of the panel arrangement to the base. 20. The method of claim 19 further comprising: providing a strain relief member;loosely securing the strain relief member to the base;positioning portions of the one or more lead wires between the strain relief member and the base; andtightening the strain relief member to the base to hold the portions of the one or more lead wires against the base. 21. The method of claim 18 further comprising removably attaching an intermediate member to the base prior to securing of the panel arrangement to the base, and wherein securing the panel arrangement to the base includes passing fasteners through the panel arrangement and the intermediate member and attaching the fasteners to the base. 22. The method of claim 18 wherein the panel arrangement includes a first housing portion and a second housing portion, and further comprising separately securing the first and the second housing portions to the base. 23. A power transfer arrangement for supplying power from an auxiliary power source to an electrical system of a building, the arrangement comprising: a base having a back wall adapted to be mounted to a mounting structure;a subassembly removably attached to the base as a single structure, the subassembly comprising one or more walls that engage the base to define an interior volume, and power switching components mounted to and carried by the one or more walls, wherein the power switching components are connectable to lead wires in the interior volume; andan intermediate member that engages the base and that defines first and second areas of the base on opposite sides of the intermediate member and engagement structure associated with the base, the subassembly, and the intermediate member for engaging the base, the intermediate member, and the subassembly together. 24. The power transfer arrangement of claim 23 wherein the intermediate member segments the interior volume into a first compartment and a second compartment, and wherein the subassembly engages the first area of the base and the intermediate member to cover the first compartment, and further comprising a panel that engages the second portion of the base and the intermediate member to cover the second compartment. 25. The power transfer arrangement of claim 24 further comprising an opening between the first and the second compartment that allows passage of at least one wire between the first and the second compartments. 26. The power transfer arrangement of claim 25 wherein the opening is formed in the intermediate member. 27. The power transfer arrangement of claim 26 further comprising a strain relief member movably mounted to the intermediate member and generally aligned with the opening, wherein the strain relief member is operable to hold one or more lead wires against the back wall of the base. 28. The power transfer arrangement of claim 23 wherein the base includes a pair of sidewalls that extend from the back wall and wherein the intermediate member is removably secured in a groove formed in the pair of sidewalls and the back wall. 29. A transfer switch arrangement comprising: a cabinet having a base and a panel cooperatively defining a wiring compartment when the base and the panel are connected together;a plurality of power transfer switching components mounted to and carried by the panel and configured to be connected to wires in the wiring compartment;fasteners attaching the panel, with the power transfer switching components mounted thereon, to the base; andan intermediate member separate from the panel and removably coupled to the base, the intermediate member defining a lower end of the wiring compartment and the panel having an upper portion defining an upper end of the wiring compartmentwherein the intermediate member defines the lower end of the first-mentioned wiring compartment and defines an upper end of a second wiring compartment, and further comprising another panel attachable to the base to close the second wiring compartment. 30. The transfer switch arrangement of claim 29 wherein the intermediate member includes an opening for passing wires between the first-mentioned and the second-mentioned wiring compartments, and further comprising a strain relief member movably mounted to the base and generally aligned with the opening, wherein the strain relief member is operable to hold one or more lead wires against the back wall of the base.