An electrical enclosure having a base, a cover, and hinge pivotally connecting the base and cover. The cover has a pair of ears, each provided with a key hole for receiving hinge pins mounted on the base. The pivot pins are provided with keys that align with notch portions of the key holes when the cover is disposed at an obtuse angle, preferably about 180.degree. with respect to the base. After assembly, the base is connected to a support which limits the range of pivotal movement of the cover to an angle less than 180.degree. so that the keys and notch portions can no longer be aligned.