The assembly guide below will help the cable tray installer make the bends and others without difficulty even he had never installed wire mesh cable trays before. Since the jaws of the bolt cutter drags a layer of zinc across the cut end and forms a protective layer. Construction of a flat 90° bend (A) The amount of tray lip to be removed is equal to 2, 3/4 the width of the tray, half of this measurement will be removed on either side of the centre line. To remove the lip we can use a small hand grinder (B) or a file. On this page you'll find lots of helpful information on installing industrial containment such as steel conduit, trunking and tray. Keep checking back for updated videos, handouts and articles. Cable tray benders come in various.