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请问论坛里面有没有对Class 2+ 功能接地结构比较熟悉的,讨论一下
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像这种2类设备带功能接地的,一般认证机构划分到Class I 还是Class II呢?7 j9 [' {* r0 P8 ?; f. O ?9 W; c
: @0 X1 D e# x m) @7 ]是依据什么?8 p# @8 I& ^' ?( Y
& I( W2 Q5 \$ a& ?如果划分到Class 2, 是不是需要标“回”符号呢?
" R+ @+ O3 w6 J; AUL 60950 2.6.2 有对这个功能接地详细描述:4 @$ \' p7 i: `+ ~. I: V& i
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9 ^' ~# p/ P2 l% c! r2.6.2 Functional earthing P: Q, q: b& v. V/ |4 a d
If FUNCTIONAL EARTHING of accessible or inaccessible conductive parts is necessary, all of the
0 B6 ~$ {0 d$ C" c8 p' kfollowing apply to the FUNCTIONAL EARTHING circuit:
) r2 O# l, U# C* \3 C" ^' S– the FUNCTIONAL EARTHING circuit shall be separated from parts at HAZARDOUS VOLTAGES in5 }) z/ ]# Z+ A$ y
the equipment by either:
* F( _1 o N7 A7 a9 D; ~2 k! x1 |• DOUBLE INSULATION or REINFORCED INSULATION; or4 i3 ?; Q1 O/ d
• a protectively earthed screen or another protectively earthed conductive
+ S. z1 s9 w$ A* N& spart, separated from parts at HAZARDOUS VOLTAGES by at least BASIC INSULATION;
b+ Y4 m% i0 [( u: ], ?and
) U: Q) {5 h- I9 B+ l– it is permitted to connect the FUNCTIONAL EARTHING circuit to a protective earth terminal
3 u: @. ^( ? U Aor to a PROTECTIVE BONDING CONDUCTOR; and7 @4 _% M! |( j' ` a: r' a y5 ~4 R
– wiring terminals to be used only for FUNCTIONAL EARTHING shall not be marked by the
2 G0 N- ^" j( F) N1 S7 P8 b& \- n- msymbol (60417-IEC-5017) or by the symbol (60417-IEC-5019), except that,
6 Y$ E9 J- [/ B" hwhere a wiring terminal is provided on a component (for example, a terminal block) or P2 u% c; b% H; I) k" p7 O& m
subassembly, the symbol is permitted; and
2 x* W: U; K8 K: gNOTE Other markings such as one of the symbols, (IEC 60417-5018 (DB:2002-10)) or (IEC 60417-50207 S9 y: s3 |2 N- P% V
(DB:2002-10)), if appropriate, are permitted.; {5 |" d7 `! l4 ]. h& Y X
– for internal FUNCTIONAL EARTHING conductors, the colour combination green-and-yellow
- b) M$ J) t# i9 c! H; vshall not be used except in multipurpose preassembled components (for example,
. w# x- k0 E. g; e `multi-conductor cables or EMC filters); and
/ R( X0 m6 h( _" c# f1 g– in a power supply cord where a conductor having green-and-yellow insulation is
& C6 j7 h [9 i' a! o( ]6 d+ jused only to provide a FUNCTIONAL EARTHING connection:4 r, ~/ z& u* F- R0 N
• the equipment shall not be marked with the symbol (IEC 60417-5172
! H N, i a) I" ~8 R7 g( f(DB:2003-02)); and
' ]: ]2 ]/ w! x9 P" ?- L• there are no requirements other than those in 3.1.9 regarding the: N# [% e4 I, M( E# T% i% G
termination of this conductor at the equipment end.( U7 L7 }( f7 F4 D5 j
MARCH 27, 2007 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 89 |
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