小米 发表于 2012-9-8 15:18

DSH 649 Provision for earthing


http://decisions.iecee.org/icons/ecblank.gif DSH 649

Provision for earthing
27
60335-1(ed.4)


Question:
Can a ball-bearing be considered as a reliable connection to earthed metal parts such as a motor shaft? According to CTL DSH 263 it is not accepted for electric tools
Decision:
A ball - bearing can be considered as a reliable earth connection for household appliances if it complies with earthing requirements of the standard.


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