An enclosure comprising: a housing including first and second housing parts (408, 410) that cooperate to enclose an interior of the housing, the first and second housing parts (408, 410) being moveable relative to one another between an open position and a closed position; a perimeter seal defined between the first and second housing parts (408, 410) when the first and second housing parts (408, 410) are in the closed position; the first housing part including a main wall and a perimeter wall that projects from the main wall, wherein the perimeter wall includes first and second sidewall portions (454, 456) respectively at the first and second sides (438, 440) of the housing, wherein the first and second sidewall portions (454, 456) are separated by a width of the housing, wherein plate retention tabs are unitarily formed with the first and second sidewall portions (454, 456), wherein the enclosure includes a component mounting plate sized to extend across the width of the housing, wherein the component mounting plate is retained at the main wall at a component plate mounting location within the interior of the housing by a snap-fit connection provided by the plate retention tabs, wherein the plate retention tabs include ramp surfaces that angle from the first and second sidewall portions (454, 456) into the interior of the housing as the ramp surfaces extend in a direction toward the main wall, wherein the ramp surfaces terminate at shoulder portions that oppose the main wall, characterized in that the main wall defines a plate recess for receiving the component mounting plate, wherein the component mounting plate is flush with a primary surface of the main wall when mounted in the plate recess, wherein the plate recess has a depth equal to a thickness of the component mounting plate, wherein when the component mounting plate is snapped into the plate recess, the shoulder portions retain the mounting plate within the plate recess. a housing including first and second housing parts (408, 410) that cooperate to enclose an interior of the housing, the first and second housing parts (408, 410) being moveable relative to one another between an open position and a closed position; a perimeter seal defined between the first and second housing parts (408, 410) when the first and second housing parts (408, 410) are in the closed position; the first housing part including a main wall and a perimeter wall that projects from the main wall, wherein the perimeter wall includes first and second sidewall portions (454, 456) respectively at the first and second sides (438, 440) of the housing, wherein the first and second sidewall portions (454, 456) are separated by a width of the housing, wherein plate retention tabs are unitarily formed with the first and second sidewall portions (454, 456), wherein the enclosure includes a component mounting plate sized to extend across the width of the housing, wherein the component mounting plate is retained at the main wall at a component plate mounting location within the interior of the housing by a snap-fit connection provided by the plate retention tabs, wherein the plate retention tabs include ramp surfaces that angle from the first and second sidewall portions (454, 456) into the interior of the housing as the ramp surfaces extend in a direction toward the main wall, wherein the ramp surfaces terminate at shoulder portions that oppose the main wall, characterized in that the main wall defines a plate recess for receiving the component mounting plate, wherein the component mounting plate is flush with a primary surface of the main wall when mounted in the plate recess, wherein the plate recess has a depth equal to a thickness of the component mounting plate, wherein when the component mounting plate is snapped into the plate recess, the shoulder portions retain the mounting plate within the plate recess.