Enclosure having a lid pivotable to a selfsustaining open position

An enclosure (10) for terminal blocks for connection of telephone service cables to others thereof or to a distribution cable (16) providing for mounting therewithin of different types of terminal block. A lid (12) is pivotable from a closed position to a first fully open position where it retains itself open, and may be further pivotable beyond the first open position to a second fully open position where it similarly retains itself open. At least two tab sections (80) of the lid's rear wall (40) have free ends (82) that abut the enclosure's rear wall when the lid is pivoted open. Corners (84, 85) of the tab free ends (82) compressively bear against the enclosure's rear wall and serve as detents to inhibit unintentional lid rotation out of either fully open position.