DSH 742 Supply Cord temperatures
http://decisions.iecee.org/icons/ecblank.gif DSH 742
Supply Cord temperatures
11.8 table 3
60335-1(ed.4)
Question:
IEC60335-1 clause 11.8 table 3 states:
For supply cords without temperature rating the test limit is still and has always been 50K rise. Lately a test lab has rejected a vacuum cleaner since they interpret the supply cord as being a cord with cord sheaths used as supplementary insulation. Therefore the 35K rise limit was applied and consequently the appliance was rejected since the cord temperature was not meeting this limit.
What is the right temperature rise limit to apply for a standard supply cord not having a temperature rating? The cord used for this appliance is of the type HO5VV-F (CENELEC) which is similar to 60227 IEC 53.
Decision:
Based on the definition in the in IEC 60335-1 the temperature limit to apply is 50K rise, as it is mentioned in table 3, for the following reason:
· Cord sheaths are cords with an additional sheath on the supply cord and that additional sheath has to be regarded as supplementary isolation. The normal cord without that additional sheath has been used in all other already approved and certified appliances.
The 50K rise requirement is explicitly mentioned as the requirement for supply cords
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