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BARRY:) F7 r: _# @0 \; p& m. B
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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% h4 u' z# I% e+ h0 B& `4 U
For STATIONARY PERMANENTLY CONNECTED EQUIPMENT or STATIONARY PLUGGABLE EQUIPMENT4 ~6 G+ s- A- l
TYPE B having a main protective earthing terminal, if the TOUCH CURRENT measurements
2 g- b4 F$ c; ^8 Pexceed 3,5 mA r.m.s., all of the following conditions apply:
4 Q" g4 j4 H$ A- b" m% [: i \– the r.m.s. PROTECTIVE CONDUCTOR CURRENT shall not exceed 5 % of the input current per5 G' R1 S) T# X2 L# S3 T; C' P$ D
line under normal operating conditions. If the load is unbalanced, the largest of the three
/ u Z4 k$ ^; \! z1 U' tline currents shall be used for this calculation. To measure the PROTECTIVE CONDUCTOR
4 r. Z8 |4 }) \) p, VCURRENT, the procedure for measuring TOUCH CURRENT is used but the measuring
5 s; f, E% B D+ D8 d+ rinstrument is replaced by an ammeter of negligible impedance; and
s; W7 p1 T5 }1 P# |) i3 p– the cross-sectional area of the PROTECTIVE BONDING CONDUCTOR shall be not be less than
D2 h9 E% P8 |5 q3 kthat of the conductors in table 3B (see 3.2.5), with a minimum of 1,0 mm2 in the path of
+ \$ \6 f9 x; e5 y' j" n. Chigh PROTECTIVE CONDUCTOR CURRENT; and, b# f P) l& Z6 U; I
– one of the following labels, or a label with similar wording, shall be affixed adjacent to) @ d4 |0 m) A; o
the equipment AC MAINS SUPPLY connection:
# m8 Z$ z! @8 t w; I7 V; VWARNING! x2 x- ?5 o; ?9 l. D8 |, L8 q
HIGH LEAKAGE CURRENT7 f% l9 n( R) d6 M
EARTH CONNECTION ESSENTIAL
3 }* k0 j5 f d' s3 v1 {BEFORE CONNECTING SUPPLY: e/ L; o! Q! l9 G+ P; w
WARNING
7 X) p5 k7 @' H( K9 QHIGH TOUCH CURRENT2 r1 {. |: a, H# h9 @; n
EARTH CONNECTION ESSENTIAL5 R) ?/ }' G3 `7 e4 S3 O
BEFORE CONNECTING SUPPLY |
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