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本帖最后由 ljh809809 于 2015-8-17 17:18 编辑 0 p7 g, ^! U% F# l2 x+ s3 M
8 O( U$ ~8 M; t- O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。" H8 q$ m3 x! p/ l' q
2.6.2 Functional earthing9 p' q2 s& C. `& D7 z% w* A3 U
If FUNCTIONAL EARTHING of accessible or inaccessible conductive parts is necessary, all of the
( z X6 O* E) M( ^( Zfollowing apply to the FUNCTIONAL EARTHING circuit:
$ @/ u( o- `$ o- d" x% ] Z1 p− the FUNCTIONAL EARTHING circuit shall be separated from parts at HAZARDOUS VOLTAGES in
/ J4 \ {* ?% o6 W. L" K# _the equipment by either:- m$ q! v# [$ U0 z6 S: F. S
• DOUBLE INSULATION or REINFORCED INSULATION; or5 d& H& C- a8 k+ e' A' c5 h
• a protectively earthed screen or another protectively earthed conductive part, separated
0 \& k r) j' j: rfrom parts at HAZARDOUS VOLTAGES by at least BASIC INSULATION; and
3 w" F# A) `; W$ L, M− it is permitted to connect the FUNCTIONAL EARTHING circuit to a protective earth terminal or
2 N# j& c5 F* L, c2 {to a PROTECTIVE BONDING CONDUCTOR; and
% }2 [5 H! k/ m− wiring terminals to be used only for FUNCTIONAL EARTHING shall not be marked by the1 T. D# ]0 _' q- k K: M# \" x# V: K
symbol (60417-IEC-5017) or by the symbol (60417-IEC-5019), except that, where a' L6 x4 X/ c: Q! X9 f; l+ G
wiring terminal is provided on a component (for example, a terminal block) or. ~2 H3 e ], A7 _
subassembly, the symbol is permitted; and0 v! ?/ Q) _* m4 P1 V- J- |
NOTE Other markings such as one of the symbols, (IEC 60417-5018 (DB:2002-10)) or
0 ?- Y/ o @: _1 V2 e1 r& |# d(IEC 60417-5020
* k5 h: b: c8 B& m7 x(DB:2002-10)), if appropriate, are permitted.
7 @& `4 R* E/ Q− for internal FUNCTIONAL EARTHING conductors, the colour combination green-and-yellow
' C6 v4 ]4 g2 i0 o4 Nshall not be used except in multipurpose preassembled components (for example, multiconductor
( X( W8 W2 T6 p2 |& ^; X5 C6 Ucables or EMC filters); and
8 q+ R6 q4 T2 WNOTE Other markings such as one of the symbols, (IEC 60417-5018 (DB:2002-10)) or
4 q: H: n0 q# x7 ?2 \! r(IEC 60417-5020
: r7 t5 N) b( x3 ?(DB:2002-10)), if appropriate, are permitted.
( G4 h5 r6 |; S- g( y− for internal FUNCTIONAL EARTHING conductors, the colour combination green-and-yellow! ^% x# ^! }7 O. F
shall not be used except in multipurpose preassembled components (for example, multiconductor
! m. \$ I6 J5 q8 g/ s2 ]cables or EMC filters); and {: U! P% @) H9 Y; L) ]
− in a power supply cord where a conductor having green-and-yellow insulation is used only
* R* L# @; T2 Hto provide a FUNCTIONAL EARTHING connection:
- l1 l' x( h; n4 a. K: }• the equipment shall not be marked with the symbol (IEC 60417-5172 (DB:2003:02));
% h% M5 z+ \ V+ Nand, Q' D0 S! a4 ?0 c& [/ }( S
• there are no requirements other than those in 3.1.9 regarding the termination of this
7 l; W3 u7 {8 v; \! }. uconductor at the equipment end.
- t8 f4 l4 f5 L/ GFor equipment having a power supply cord where a conductor with green-and-yellow
8 y% \9 w8 S& W& Pinsulation is used only to provide a FUNCTIONAL EARTHING connection:3 m. ` |+ W( O1 \2 o+ i' D* d/ e
− the equipment shall not be marked with the symbol , IEC 60417-5172 (2003-02); and
, J0 M: O5 L) f0 Q3 O5 f: R) d− the equipment may be marked with:4 V' ^- S3 N# E$ p
• the symbol , IEC 60417-5018 (2011-07); or
$ R/ N3 Z! [* V9 V1 ^7 o& q Q• the symbol , IEC 60417-6092 (2011-10).
. c) M1 O& s' c& @; ~! H% Q; Z0 mThese symbols shall not be used for CLASS I EQUIPMENT.
- C _/ N6 j/ J9 X+ M$ TThere are no requirements other than those in 3.1.9 regarding the termination of this
8 G- M/ G) Y6 P. J6 ^FUNCTIONAL EARTHING conductor at the equipment end.; ?" c! P$ g+ r, q4 I
Compliance is checked by inspection.
0 K- P! W1 f6 ]+ f. `5 |! J; \; ]' O/ {0 D; ~/ e3 P
图片出不来，有兴趣可以看原文标准。$ {6 p# K6 h) O$ P
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发表于 2014-6-5 23:51
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发表于 2014-6-6 01:48
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