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qingjunfa 发表于 2013-12-5 09:43 " H5 P- [) j6 |3 u
依照IEC60335-1标准来讲,严格意义上L,N之间的应该是功能性绝缘即可.但由于说通常L,N之间爬电距离通常都可 ... $ ^! U$ {2 T, z: u0 `& p
Standard:
) u* D" G9 b6 o2 M! t( V1 cEN 60950:2000
. E: k4 P% }* O, t4 n- V: IEN 60950-1:2001" y3 D! x0 l2 m7 Z- J
Sub clause:! T7 Y$ u, c5 @& G* h
2.10 Sheet no.: " E y7 u; n3 X3 I+ q0 {
95/14
, ~$ ?6 C3 M0 s0 g$ `5 M( L! g; ` J, U5 t! x q; h
Page 1 of 1, v- J) H; N; z# u& O# L
Subject: ) a1 r6 F9 N& @: M5 q! m) l
Clearances, creepage distances distances etc. Key words:( Q$ ^5 t5 y& _7 _$ P4 h1 P
Functional/Operational insulation
: \" |) @, Q+ m8 C. | Meeting:
4 n, ~' N# q3 J; Y6 |9 BOSM/EE – 1995
9 v& T6 w! t2 z5 I5 T' BItem no. 9.12: N5 [* a: b$ |6 }' i
Question: -& [- O2 n$ i( ~# ]2 f) S8 w/ ?- |
8 }5 d1 b, _( O& K2 I! WDecision:. L4 E, I# O6 X2 _( w
Insulation between parts directly connected to the mains in front of a fuse has to fulfill the requirements for operational insulation or pass the test of 5.3.4 b).% V8 c g" P3 a5 b
Explanatory notes:
$ B2 s! Q; \: dThe CENELEC common modifications to cl. 2.7.1 will not accept the short-circuiting and reliance on the installation fuse.4 Q" p3 B" t$ J2 p8 X {, i- f3 k
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