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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% s v* G2 d- J/ L4 ?; R
( H }4 ]8 `: D4 T6 y$ W
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？
( [3 h9 @; z5 c$ s" R7 z f& H2 ^, |! D$ y3 v2 ^& B& f1 O
是依据什么？; e( V3 ]; q- W+ _& M( c @
% W3 {& T, x: o7 U- v" }
如果划分到Class 2， 是不是需要标“回”符号呢？
7 s1 B6 p0 d6 \UL 60950 2.6.2 有对这个功能接地详细描述：" i9 L6 w) n3 p) E2 ?7 i2 N6 R
! U& D* i' y2 `9 J# {
" {8 v: h/ A0 ^! ]+ F( N2.6.2 Functional earthing
' P0 O5 f6 O R: M8 y7 _6 BIf FUNCTIONAL EARTHING of accessible or inaccessible conductive parts is necessary, all of the
! N6 W* u' f0 o- }5 u( b9 Dfollowing apply to the FUNCTIONAL EARTHING circuit:
. H+ d4 z: z& L4 i) S– the FUNCTIONAL EARTHING circuit shall be separated from parts at HAZARDOUS VOLTAGES in" {& L- k; S5 W ?
the equipment by either:! i5 \# f+ \8 F7 \5 U# S0 d
• DOUBLE INSULATION or REINFORCED INSULATION; or2 b) W" L: i. H% P. a
• a protectively earthed screen or another protectively earthed conductive6 @) \( n7 X" T4 ` @2 k
part, separated from parts at HAZARDOUS VOLTAGES by at least BASIC INSULATION;
% r v7 z; J) U3 N' {and
& s0 w" e' _; l. h/ D; V3 W: [– it is permitted to connect the FUNCTIONAL EARTHING circuit to a protective earth terminal2 ]3 k9 r9 w! C
or to a PROTECTIVE BONDING CONDUCTOR; and! P. {8 k0 j8 L- v1 I7 D( X6 n
– wiring terminals to be used only for FUNCTIONAL EARTHING shall not be marked by the
! X: g/ x) i0 p/ j- s gsymbol (60417-IEC-5017) or by the symbol (60417-IEC-5019), except that,
2 S8 I& F6 h0 i5 \5 b5 w0 owhere a wiring terminal is provided on a component (for example, a terminal block) or3 x. c9 O% G# L$ u5 B2 O
subassembly, the symbol is permitted; and
. n- A6 b5 N& d" d ANOTE Other markings such as one of the symbols, (IEC 60417-5018 (DB:2002-10)) or (IEC 60417-5020% A5 ^2 b6 ~* D; H; }+ z
(DB:2002-10)), if appropriate, are permitted.
: p* H9 s) S. H- J– for internal FUNCTIONAL EARTHING conductors, the colour combination green-and-yellow3 ?$ t. ^3 v& `, @
shall not be used except in multipurpose preassembled components (for example,
$ J1 z4 X& a2 j4 X4 J- b- C$ Rmulti-conductor cables or EMC filters); and+ ?; G& T3 v9 s7 w7 b c
– in a power supply cord where a conductor having green-and-yellow insulation is
; Y- T+ O- s1 ^' W3 \used only to provide a FUNCTIONAL EARTHING connection:3 a9 E8 H: L& H1 `5 t4 A5 I
• the equipment shall not be marked with the symbol (IEC 60417-5172
( p6 H5 I- H" x2 J5 `! _(DB:2003-02)); and3 v! g1 ]6 ^- h N
• there are no requirements other than those in 3.1.9 regarding the% `* M) B4 u! h0 D
termination of this conductor at the equipment end.
0 x( V8 `6 F/ ]5 z! `: tMARCH 27, 2007 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 89 |
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