Annex B – (normative) – Motors not isolated from the supply mains and having basic insulation
not designed for the rated voltage of the tool
B.1 Scope
B.1.1 This annex applies to motors having a working voltage not exceeding 42 V, not isolated from the
supply mains, and having basic insulation not designed for the rated voltage of the tool.
All clauses of this standard apply to these motors, unless otherwise specified in this annex.
B.9 Protection against access to live parts
B.9.1 Metal parts of the motor are considered to be bare live parts.
B.12 Heating
B.12.3 The temperature rise of the body of the motor is determined instead of the temperature rise of the
windings.
B.12.5 The temperature rise of the body of the motor, where it is in contact with insulating material, shall
not exceed the values shown in Table 1 for the relevant insulating material.
B.15 Electric strength
B.15.3 The insulation between live parts of the motor and its other metal parts is not subjected to this test.
B.18 Abnormal operation
B.18.1 The test of 18.7 is not made.
Tools are also subjected to the test of B.18.101.
B.18.101 The tool is operated at rated voltage with each of the following defects:
– short circuit of the terminals of the motor, including any capacitor incorporated in the motor circuit;
– open circuit of the supply to the motor;
– open circuit of any shunt resistor during operation of the motor.
Only one defect is simulated at a time, the tests being made consecutively.
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