FIELD: electrical engineering. SUBSTANCE: device has vertical plank one end of which is provided with an insulating hook and the other end is provided with a cross-beam. The cross-beam is made up as three links. The intermediate link is coupled with the vertical plank. Two end links are pivotally connected with the intermediate link to permit their rotation in the horizontal plane in opposite directions when the device is introduced in a recess and to permit locking the links in an operating position of the device. EFFECT: enhanced reliability. 4 cl, 9 dwg
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