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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5 M$ r! q# Q" p+ o Q; ?
" J2 m5 i0 X7 B$ {: p4 z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?
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是依据什么?
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如果划分到Class 2, 是不是需要标“回”符号呢?
& j/ h" h! `: y4 Q5 G2 iUL 60950 2.6.2 有对这个功能接地详细描述:3 b% t+ m+ {( F: C5 t }
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/ I, v1 v( G# w& \2.6.2 Functional earthing5 a8 Y- l8 W# p S" Q/ f
If FUNCTIONAL EARTHING of accessible or inaccessible conductive parts is necessary, all of the" j. J, p3 L2 b0 B7 C
following apply to the FUNCTIONAL EARTHING circuit:1 R8 q8 A' i. _ w. L
– the FUNCTIONAL EARTHING circuit shall be separated from parts at HAZARDOUS VOLTAGES in
4 d3 F& h+ t1 S) ]; |5 o" Bthe equipment by either:
! b7 D+ Z2 R, Y• DOUBLE INSULATION or REINFORCED INSULATION; or
) E+ k' p, k4 z• a protectively earthed screen or another protectively earthed conductive
8 L! G, A7 ~ }$ r0 Q4 F0 }part, separated from parts at HAZARDOUS VOLTAGES by at least BASIC INSULATION;6 N' {( g# ?. w- K
and
$ k# [" M0 w! \, l8 t, l– it is permitted to connect the FUNCTIONAL EARTHING circuit to a protective earth terminal
# C5 O* T) C" H# hor to a PROTECTIVE BONDING CONDUCTOR; and$ J) \* E1 X9 L; m
– wiring terminals to be used only for FUNCTIONAL EARTHING shall not be marked by the
! H! t8 y% b/ k- K, n+ J5 }9 Rsymbol (60417-IEC-5017) or by the symbol (60417-IEC-5019), except that,
2 ]9 I. j7 q% E) bwhere a wiring terminal is provided on a component (for example, a terminal block) or3 |* [! n7 D( v
subassembly, the symbol is permitted; and
6 l$ o0 l9 z+ |) C; tNOTE Other markings such as one of the symbols, (IEC 60417-5018 (DB:2002-10)) or (IEC 60417-50205 M$ \7 g: W- z& S' m8 d. a
(DB:2002-10)), if appropriate, are permitted. o& n+ g) y. i& @+ G" S- |3 Q% K
– for internal FUNCTIONAL EARTHING conductors, the colour combination green-and-yellow
. Z- Z" J# j, Z8 Qshall not be used except in multipurpose preassembled components (for example,
8 J: T, U( ?) i( Z- Nmulti-conductor cables or EMC filters); and
( g4 f7 V7 E. u2 X6 D– in a power supply cord where a conductor having green-and-yellow insulation is8 o5 P( [2 J; ]& w- u' L) b' ^# s
used only to provide a FUNCTIONAL EARTHING connection:
& ?* |6 E% p' q4 D( W( c• the equipment shall not be marked with the symbol (IEC 60417-5172: C6 k$ P" x9 ?4 T' F
(DB:2003-02)); and1 d5 Y" t' D& P$ ~- @; T
• there are no requirements other than those in 3.1.9 regarding the
1 p3 n) }5 A d2 o4 Vtermination of this conductor at the equipment end.: s7 G8 i% g, M
MARCH 27, 2007 CAN/CSA-C22.2 NO. 60950-1-07 ♦ UL 60950-1 89 |
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