For constructions other than those of class III, handles, levers and knobs which are held or actuated in normal use shall not become live in the event of an insulation fault. If these handles, levers or knobs are of metal, and if their shafts or fixings are likely to become live in the event of a basic insulation fault, they shall either be adequately covered by insulating material, or their accessible parts shall be separated from their shafts or fixings by insulation.The covering or insulating material shall comply with the electric strength test in Clause 15, Table 2, item 4, but need not be supplementary insulation.Compliance is checked by inspection, and if necessary, by the tests specified for insulation.