An insulator for a medium voltage power line cable, comprising: an insulator body; means for attaching the insulator body to a support structure; a cable support attached to the insulator body; the cable support comprising a recess having a bottom, a first side wall extending from a first side of the bottom and a second side wall extending from a second side of the bottom; the recess having an opening between the first side wall and the second side wall configured to receive a power line cable sideways; and a cable clamp configured to retain the power line cable in the recess, comprising a tightening means for tightening the cable clamp to the power line cable; wherein the tightening means are pivotally connected to the insulator body and the cable clamp comprises a latch connected to the tightening means at the side defined by the first side wall; characterized by: the first side wall extending from the first side of the bottom having a first bend along a first radius to a portion perpendicular to the bottom for improving retaining of the power line cable in the recess in an untightened position; the recess having a first groove on the first side wall and a second groove on the second side wall, configured to receive the latch over the power line cable; the latch extending over the first groove and the second groove and comprising an extension extending sideways over the second groove outside the recess; an outer surface of the second side wall comprising a slot for receiving the extension and retaining the latch between the first side wall and the second side wall; the outer surface of the second side wall comprising multiple slots (160, 161, 162) for receiving the extension and adjusting the latch position on the second groove during a tightened position; and the insulator allowing the power line cable to slide through the insulator until the latch has been tightened into a final position. an insulator body; means for attaching the insulator body to a support structure; a cable support attached to the insulator body; the cable support comprising a recess having a bottom, a first side wall extending from a first side of the bottom and a second side wall extending from a second side of the bottom; the recess having an opening between the first side wall and the second side wall configured to receive a power line cable sideways; and a cable clamp configured to retain the power line cable in the recess, comprising a tightening means for tightening the cable clamp to the power line cable; wherein the tightening means are pivotally connected to the insulator body and the cable clamp comprises a latch connected to the tightening means at the side defined by the first side wall; characterized by: the first side wall extending from the first side of the bottom having a first bend along a first radius to a portion perpendicular to the bottom for improving retaining of the power line cable in the recess in an untightened position; the recess having a first groove on the first side wall and a second groove on the second side wall, configured to receive the latch over the power line cable; the latch extending over the first groove and the second groove and comprising an extension extending sideways over the second groove outside the recess; an outer surface of the second side wall comprising a slot for receiving the extension and retaining the latch between the first side wall and the second side wall; the outer surface of the second side wall comprising multiple slots (160, 161, 162) for receiving the extension and adjusting the latch position on the second groove during a tightened position; and the insulator allowing the power line cable to slide through the insulator until the latch has been tightened into a final position.