Adjustable-depth ring assembly

An adjustable-depth ring assembly for connection to an electrical box that is accessible through a structure opening in a structure disposed forward of the electrical box, the assembly comprising:

• a cover plate configured for attachment to the electrical box, the cover plate including a planar rigid plate and a raised portion projecting laterally from the rigid plate and defining an opening;
• an extension ring sized for reception in the opening of the cover plate to couple the extension ring to the cover plate, said extension ring defining a cavity, the extension ring being movable relative to the cover plate along an axis extending in front-to-back direction such that an axial distance between a front of the extension ring and the cover plate can be adjusted to accommodate structures of different thicknesses;
• a first pair of tabs extending laterally from the extension ring, each tab of the first pair of tabs defining an opening for mounting an electrical device to the extension ring, wherein a line segment connects centers of the openings of the first pair of tabs;
• and
• a second pair of tabs extending laterally from the extension ring, each tab of the second pair of tabs defining an opening for mounting an electrical device to the extension ring, wherein a line segment connects centers of the openings of the second pair of tabs, the line segments connecting the centers of the openings in each pair of tabs intersecting at a center of the ring.