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标题: DSH 649 Provision for earthing [打印本页]
作者: 小米    时间: 2012-9-8 15:18
标题: DSH 649 Provision for earthing
DSH 6498 J0 k5 h( X( K; Q- ?* w' P& ~# p

9 B# x$ e/ G: m0 {) U		Provision for earthing) C% F" z# @- W" u: D) j
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Question:
# U0 f3 D# z; ?& p; d7 W" w3 zCan 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
3 c: L" n* A1 `% q5 ^3 _Decision:
' L2 E* d* v6 u# H7 C- Z$ iA ball - bearing can be considered as a reliable earth connection for household appliances if it complies with earthing requirements of the standard.2 S& ?% E& [! g4 b; D6 S0 [: ]  A

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