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本帖最后由 ljh809809 于 2015-8-17 17:18 编辑 f3 a( B" b' Q1 k
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标准是相通的。可以参考这个 IEC60950-1:2005+A1:2009+A2:2013说得好清楚了。
, V; N p4 d. x6 R9 \2.6.2 Functional earthing
5 ?$ q3 t- v) [If FUNCTIONAL EARTHING of accessible or inaccessible conductive parts is necessary, all of the
6 y$ S a" L+ x/ Gfollowing apply to the FUNCTIONAL EARTHING circuit:
3 i6 U7 F+ B9 i7 v4 L: O− the FUNCTIONAL EARTHING circuit shall be separated from parts at HAZARDOUS VOLTAGES in
& n+ m" x7 Z6 `( j- L0 \) Bthe equipment by either:
) k* C2 B9 Z; s' t; q• DOUBLE INSULATION or REINFORCED INSULATION; or
; K V% t1 W* D- e2 |0 Q• a protectively earthed screen or another protectively earthed conductive part, separated
9 S E; {/ x! N# a" s% vfrom parts at HAZARDOUS VOLTAGES by at least BASIC INSULATION; and' o; Q! Y8 W& X. A8 s' b% d
− it is permitted to connect the FUNCTIONAL EARTHING circuit to a protective earth terminal or) ] _) a7 d% M% ~& F- Y5 v
to a PROTECTIVE BONDING CONDUCTOR; and
( ^' ~$ h8 j, j8 J/ D0 z$ I− wiring terminals to be used only for FUNCTIONAL EARTHING shall not be marked by the
. x2 Y( d% v t5 Z Usymbol (60417-IEC-5017) or by the symbol (60417-IEC-5019), except that, where a
5 { L0 e! b! fwiring terminal is provided on a component (for example, a terminal block) or: n! w7 H! Z9 ?
subassembly, the symbol is permitted; and8 n8 I( A+ D5 w. N5 a/ J
NOTE Other markings such as one of the symbols, (IEC 60417-5018 (DB:2002-10)) or& M* V' @$ P* C9 {7 v0 P9 {
(IEC 60417-5020
3 q @# h4 T5 j: {. z(DB:2002-10)), if appropriate, are permitted." ~/ V3 r% r6 O) W1 D' J9 Z
− for internal FUNCTIONAL EARTHING conductors, the colour combination green-and-yellow* I, W5 v5 q; p
shall not be used except in multipurpose preassembled components (for example, multiconductor- N; q1 W/ J3 H6 ~+ \- _7 K6 F/ r
cables or EMC filters); and+ `% X$ U5 {$ B6 I3 M) ?
NOTE Other markings such as one of the symbols, (IEC 60417-5018 (DB:2002-10)) or9 a4 a; X. ?0 `$ z
(IEC 60417-50207 k$ j2 l- x0 e; j# l4 ^$ s4 I0 ~
(DB:2002-10)), if appropriate, are permitted./ x N( a* E1 M" \" M
− for internal FUNCTIONAL EARTHING conductors, the colour combination green-and-yellow
3 ^, _8 i+ F3 v: Z# ^8 L% W' G4 [8 ushall not be used except in multipurpose preassembled components (for example, multiconductor
* a4 ]! A2 o( O, l( M$ h5 dcables or EMC filters); and
) B9 W) ^9 G1 [1 C3 H− in a power supply cord where a conductor having green-and-yellow insulation is used only
f/ c. M) ^( V3 S5 _to provide a FUNCTIONAL EARTHING connection:( i# h' ~4 R! F* f' T4 \& t7 Z P
• the equipment shall not be marked with the symbol (IEC 60417-5172 (DB:2003:02)); d& Y! ]2 M: G/ E+ A3 t% ]9 N
and
8 ?3 f" A8 D3 ^% o• there are no requirements other than those in 3.1.9 regarding the termination of this) k1 @- v# s# E2 K8 K0 u# O
conductor at the equipment end.6 I9 T5 v8 b, W; F/ g0 N0 ~7 l
For equipment having a power supply cord where a conductor with green-and-yellow4 T8 F. v X) |* B9 A) \+ z
insulation is used only to provide a FUNCTIONAL EARTHING connection:
2 I0 U( L) C1 `. d− the equipment shall not be marked with the symbol , IEC 60417-5172 (2003-02); and
: L) w3 V5 r# c! ?) t− the equipment may be marked with:
( Y& ~( \) o3 ]5 T, K• the symbol , IEC 60417-5018 (2011-07); or w' D& ?0 g" \( N: b
• the symbol , IEC 60417-6092 (2011-10).
4 Z7 n0 v) J( n' T, UThese symbols shall not be used for CLASS I EQUIPMENT.% k4 L C4 t1 w- R; W) ~+ f
There are no requirements other than those in 3.1.9 regarding the termination of this
7 U& D' `2 R9 J8 y* [FUNCTIONAL EARTHING conductor at the equipment end.7 o6 q5 Y; t: s: ^
Compliance is checked by inspection.* U8 |0 a1 K* e j% Y
; F0 a1 ^8 `# |" ?& p+ U- W图片出不来,有兴趣可以看原文标准。8 r) S3 n. b# g* @# D3 a
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