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BARRY:0 a& F; c% f+ C6 Q% D p
' h* k0 I/ B7 |/ x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.
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5.1.7 Equipment with touch current exceeding 3,5 mA* B T* ?0 V! `) m' H) l
For STATIONARY PERMANENTLY CONNECTED EQUIPMENT or STATIONARY PLUGGABLE EQUIPMENT- m5 |& C8 ^" g: Y
TYPE B having a main protective earthing terminal, if the TOUCH CURRENT measurements
9 R* K8 \" E' [0 R% oexceed 3,5 mA r.m.s., all of the following conditions apply:4 Z# u' M' M0 @. u& w: {; d
– the r.m.s. PROTECTIVE CONDUCTOR CURRENT shall not exceed 5 % of the input current per
$ l" E( I4 n4 A7 Hline under normal operating conditions. If the load is unbalanced, the largest of the three" R0 s% i0 j, D1 Y) T& l
line currents shall be used for this calculation. To measure the PROTECTIVE CONDUCTOR& a: F. l$ P, }2 I$ m3 t4 I
CURRENT, the procedure for measuring TOUCH CURRENT is used but the measuring: G3 Z+ u4 g, N6 m7 H) R
instrument is replaced by an ammeter of negligible impedance; and
/ _3 }* G: p5 A( [! o1 [+ H: E– the cross-sectional area of the PROTECTIVE BONDING CONDUCTOR shall be not be less than7 C0 h O3 B; Q; Y5 q- l# C# B
that of the conductors in table 3B (see 3.2.5), with a minimum of 1,0 mm2 in the path of
/ m+ V3 h. f8 r& A, N4 q3 `high PROTECTIVE CONDUCTOR CURRENT; and
! u% m# Q n! u! C– one of the following labels, or a label with similar wording, shall be affixed adjacent to
& D1 r- c- t c. [3 ethe equipment AC MAINS SUPPLY connection:# @) d4 S& M, W/ B
WARNING4 C8 f; v5 ^) W4 @5 G# ]
HIGH LEAKAGE CURRENT8 D( u9 r3 A$ l1 M0 U9 Q
EARTH CONNECTION ESSENTIAL
$ X) L8 [% B! E, }4 t A; O/ GBEFORE CONNECTING SUPPLY: N! A5 `* G' U3 H. i1 Q6 Z( n
WARNING% u/ q- m+ \/ F1 Q9 z5 t
HIGH TOUCH CURRENT
- x* _1 I* j) B0 mEARTH CONNECTION ESSENTIAL8 Y) K2 a, Q8 E' O- l5 @" _
BEFORE CONNECTING SUPPLY |
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