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![](/i/favi32.png) Summary of Topics This is the Third edition of ansi/ul 60745-1, the Standard for Safety for Hand-Held Motor- operated Electric Tools – Safety – Part 1: General Requirements and is based on iec 60745-1NOTE Non-impregnated slag-wool is an example of corrosive thermal insulationNOTE Non-impregnated slag-wool is an example of corrosive thermal insulation.
21.26DV D1
Modification: Revise the second paragraph by replacing “clauses 16 and
17” with “14.3” and adding “of 29.2” after “flammability tests”.
21.27 Tools other than class II, having parts where reliance is placed upon safety extra-low voltage to
provide the necessary degree of protection against electric shock, shall be so designed that the insulation
between parts operating at safety extra-low voltage and other live parts complies with the requirements
for double insulation or reinforced insulation.
Compliance is checked by the tests specified for double insulation or reinforced insulation.
21.28 Parts separated by protection impedance shall comply with the requirements for double insulation
or reinforced insulation.
Compliance is checked by the tests specified for double insulation or reinforced insulation.
21.29 Void
21.30 Shafts of operating knobs, handles, levers and the like shall not be live unless the shaft is not
accessible when the knob, handle, lever and the like is removed.
Compliance is checked by inspection and by applying the test finger as specified in 9.2 after removal of
the knob, handle, lever, or the like, even with the aid of a tool.
21.31 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 insulation.
Compliance is checked by inspection, and if necessary, by the tests specified for insulation.
21.32 For tools other than those of class III, handles which, in normal use, are continuously held in the
hand shall be so constructed that when gripped as in normal use, the operator’s hand is not likely to touch
metal parts unless they are separated from live parts by double insulation or reinforced insulation.
Compliance is checked by inspection.
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