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本帖最后由 ljh809809 于 2015-8-17 17:18 编辑 & N8 B3 \* j9 z7 Q) e3 U! h, s8 ~& h
( t, F" q3 Y o2 z$ ^4 G) W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。, G$ C4 i9 k/ D* Z
2.6.2 Functional earthing, A9 ~0 B! e' H {/ U, Q* s
If FUNCTIONAL EARTHING of accessible or inaccessible conductive parts is necessary, all of the
. Q `3 L, Y8 z$ g" Nfollowing apply to the FUNCTIONAL EARTHING circuit:" H, O$ m$ i0 n" U" C! f
− the FUNCTIONAL EARTHING circuit shall be separated from parts at HAZARDOUS VOLTAGES in
G( v6 \$ Y e& W/ {3 n' }9 U1 sthe equipment by either:
' B2 b" d2 y' j/ Z+ i• DOUBLE INSULATION or REINFORCED INSULATION; or
9 B0 p4 Y. ?. G• a protectively earthed screen or another protectively earthed conductive part, separated; z- @. U3 e; o
from parts at HAZARDOUS VOLTAGES by at least BASIC INSULATION; and1 w z, T. W- E U
− it is permitted to connect the FUNCTIONAL EARTHING circuit to a protective earth terminal or6 u6 V. }+ M' S+ K% C' x
to a PROTECTIVE BONDING CONDUCTOR; and
1 Q5 `; G: V+ }− wiring terminals to be used only for FUNCTIONAL EARTHING shall not be marked by the4 ?" A! e9 ?; F8 a
symbol (60417-IEC-5017) or by the symbol (60417-IEC-5019), except that, where a
# _; B' j ]0 v4 E Q' i- w$ fwiring terminal is provided on a component (for example, a terminal block) or3 X5 [) X+ t2 |! @- w6 Y9 b& W
subassembly, the symbol is permitted; and
: p$ b% _+ d" v7 q! hNOTE Other markings such as one of the symbols, (IEC 60417-5018 (DB:2002-10)) or
! h; i7 e# \* W& x7 i3 v; r(IEC 60417-5020
1 D4 y" j; u2 E4 {0 ?8 b) P7 G(DB:2002-10)), if appropriate, are permitted.
% l% K* t: D! n2 p− for internal FUNCTIONAL EARTHING conductors, the colour combination green-and-yellow
- ^! |3 F5 e1 Pshall not be used except in multipurpose preassembled components (for example, multiconductor
% ^8 u6 v# r0 k0 q6 V2 v6 R8 }0 ocables or EMC filters); and3 Z" s N6 g4 C. D: d
NOTE Other markings such as one of the symbols, (IEC 60417-5018 (DB:2002-10)) or
- S" }0 g4 Q" C( a+ a2 [(IEC 60417-5020
: F; t$ p8 v) f. ?( g$ t(DB:2002-10)), if appropriate, are permitted.
$ K/ v2 H% O. C2 E1 d− for internal FUNCTIONAL EARTHING conductors, the colour combination green-and-yellow
0 z9 J' u' Y2 W. H+ Vshall not be used except in multipurpose preassembled components (for example, multiconductor
& s' M$ {! M+ E6 qcables or EMC filters); and3 D3 W, K6 T& X% f. f, ]" W
− in a power supply cord where a conductor having green-and-yellow insulation is used only( b5 j$ d5 G; [* ]! ~
to provide a FUNCTIONAL EARTHING connection:
2 l9 I& n2 S7 _$ F0 r6 ~% i• the equipment shall not be marked with the symbol (IEC 60417-5172 (DB:2003:02));# j( W8 o3 C Z* g' O! K
and. S- \8 E& G6 W- X
• there are no requirements other than those in 3.1.9 regarding the termination of this
7 o0 I6 P0 x: O% oconductor at the equipment end.( Z" Y2 ?0 |0 e, n! |, W; t
For equipment having a power supply cord where a conductor with green-and-yellow
9 r( y5 D. E1 d/ O" L j! N) \insulation is used only to provide a FUNCTIONAL EARTHING connection:* B! b, Y) J$ _7 M5 }& A6 k9 F8 s
− the equipment shall not be marked with the symbol , IEC 60417-5172 (2003-02); and
9 \) c- |8 V- W4 y# X− the equipment may be marked with:
- ^7 J( T* I+ o; p7 e! r5 j• the symbol , IEC 60417-5018 (2011-07); or
& k- A R7 ~ k2 v• the symbol , IEC 60417-6092 (2011-10).
& J+ `; [, {0 q, BThese symbols shall not be used for CLASS I EQUIPMENT.
# b1 x K; | _1 G, uThere are no requirements other than those in 3.1.9 regarding the termination of this
: r" y# ]6 c5 }: l& l7 QFUNCTIONAL EARTHING conductor at the equipment end.
) }# [3 s, L2 W- V% ICompliance is checked by inspection.
9 d3 l- D, h6 _0 \/ |* u/ w2 x3 k7 j9 D2 N5 Y! y* H$ Y* p# i9 v
图片出不来,有兴趣可以看原文标准。( I8 t# o9 j- K ]/ d
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