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BARRY:
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5 z3 Z: S8 T2 K' {2 v见下文, 还是有限制的,只是限制的方法不同,条例是我在IEC60950中找的,回头我也找UL60950看看是不是一样的.7 v( X! @7 ~7 N: u% J: X
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6 ~2 L: \3 w# f& D5.1.7 Equipment with touch current exceeding 3,5 mA- _( q, b# z5 `+ {: x% C# A
For STATIONARY PERMANENTLY CONNECTED EQUIPMENT or STATIONARY PLUGGABLE EQUIPMENT9 ~& p9 N2 l% X9 m/ L7 l: Y9 n: y
TYPE B having a main protective earthing terminal, if the TOUCH CURRENT measurements7 \8 D; C- k8 L: D' G* u
exceed 3,5 mA r.m.s., all of the following conditions apply:
3 ]) c+ F3 r) L+ y0 E; H– the r.m.s. PROTECTIVE CONDUCTOR CURRENT shall not exceed 5 % of the input current per7 h$ t# n5 K) m, O( b
line under normal operating conditions. If the load is unbalanced, the largest of the three' n) I$ [, k4 w% e3 V+ x# o% o8 O
line currents shall be used for this calculation. To measure the PROTECTIVE CONDUCTOR1 O9 V; _( C; S& o4 Y7 C
CURRENT, the procedure for measuring TOUCH CURRENT is used but the measuring
I% B, Y9 q/ w, d) Ninstrument is replaced by an ammeter of negligible impedance; and
# P ~7 `8 H2 l& ~6 ^– the cross-sectional area of the PROTECTIVE BONDING CONDUCTOR shall be not be less than
+ i6 ^1 \0 [) B2 ~5 nthat of the conductors in table 3B (see 3.2.5), with a minimum of 1,0 mm2 in the path of) z6 u/ S$ s- W" h
high PROTECTIVE CONDUCTOR CURRENT; and
. ?5 G8 Z% U2 Z- z& A. M! a% ~– one of the following labels, or a label with similar wording, shall be affixed adjacent to
5 t7 b1 K7 k! E+ v$ J% ?0 F9 ?, f' {the equipment AC MAINS SUPPLY connection:
0 c) V* l/ K5 T, a5 h3 Q; S$ fWARNING
% z- P! G' i7 v8 o1 YHIGH LEAKAGE CURRENT
- q, P! x& B: z: P: O9 K; @EARTH CONNECTION ESSENTIAL
" ]* {0 A0 k$ x/ G3 @0 y2 ^BEFORE CONNECTING SUPPLY
; u# u# T: a$ tWARNING
% K& ^% K1 i. X1 c0 g2 [3 aHIGH TOUCH CURRENT T) ~8 t( E" u/ A3 i
EARTH CONNECTION ESSENTIAL
+ g9 i4 E1 t6 W; _/ YBEFORE CONNECTING SUPPLY |
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