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|
|  DSH 741
) d h8 W" K( x' c1 p# j: E5 U5 z' a* O' B
| Insulation of handles y0 _' V; ?% b' c$ j, f3 |0 d* F
| 22.35
( P% n+ D4 w+ e% j! D, p/ o- E! v4 l | 60335-1(ed.4)7 t" }& Y& H4 I0 G) z
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- D0 {4 T3 e( I# A, L8 F# RQuestion:
C9 P2 K7 o6 E2 j9 b; iFor a portable appliance, metal handles that are likely to become live in the event of a failure of basic insulation are required to be covered by insulating material or separated from their shafts or fixings by supplementary insulation.+ Z. W8 U$ V7 H8 a5 w0 J! _0 s9 ^( E
For a construction as shown in the attached drawing; where live parts of the tubular sheathed heating element are separated from metal parts by basic insulation; and the metal sheath is connected to protective earth in accordance with clause 27; is the metal
# s! z+ J+ k8 i; p7 |handle deemed likely to become live in the event of basic insulation failure of the heating element and therefore the handle requires additional supplementary insulation? (the metal handle is conductively connected to the metal heating element sheath)
! P# ?& ~3 Y7 I2 UDecision:0 _- l' P4 p9 x, m
Yes, the handle requires additional supplementary insulation.* e/ J0 ]' t. y- Y) |
2 }* L2 C ?4 ]' Z! ~' [' A, y
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发表于 2012-9-8 11:07
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