Note that references are to IEC 60950 Third Edition 1999-04.
Where the references in the Second Edition differ, they appear in parentheses.
REQUIREMENT
Equipment shall be so designed that the risk of fire or electric shock due to mechanical or electrical overload of failure, or due to abnormal operation or careless use, is limited as far as practicable. After abnormal operation or a fault, the equipment shall remain safe, but it is not required that the equipment should still be in full working order.
TEST METHODThe product safety engineer will examine the product and determine which are the appropriate abnormal conditions
to test for your product. He will use clause 5.4 of the standard as a guideline, together with his own engineering judgment. Abnormal conditions likely to be checked are:
- locked rotors of electric motors - blockage of ventilation openings on one surface of the product - shorting basic insulation
- short circuit and overload of transformers and power supplies - electrical components are short circuited or opened, where such a fault may cause hazards
These tests must not cause a fire which can propogate beyond the equipment. The equipment must not emit molten metal, and the enclosure must not deform in such a way that
it no longer complies with the standard (e.g. accessibility and clearance requirements).
REFERENCE
Complete requirements are given in IEC 60950, Clause 5.3 (5.4).
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