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BARRY:
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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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. @2 j+ T% F, B, W5.1.7 Equipment with touch current exceeding 3,5 mA$ s7 z$ ~* g2 g
For STATIONARY PERMANENTLY CONNECTED EQUIPMENT or STATIONARY PLUGGABLE EQUIPMENT; _6 Q8 N- Y/ H
TYPE B having a main protective earthing terminal, if the TOUCH CURRENT measurements+ N2 q, w" }7 a
exceed 3,5 mA r.m.s., all of the following conditions apply:3 S9 W& b1 N/ Y0 |/ w$ Y" Y
– the r.m.s. PROTECTIVE CONDUCTOR CURRENT shall not exceed 5 % of the input current per4 P7 w9 T: R$ d. F: s
line under normal operating conditions. If the load is unbalanced, the largest of the three: i P4 p- X3 _5 z5 W" v3 P+ W
line currents shall be used for this calculation. To measure the PROTECTIVE CONDUCTOR% ]8 I' w8 {; i+ U
CURRENT, the procedure for measuring TOUCH CURRENT is used but the measuring/ P8 c7 _/ ~& u# ?$ P* _& \0 J
instrument is replaced by an ammeter of negligible impedance; and. K2 ^' t. ~3 d/ P
– the cross-sectional area of the PROTECTIVE BONDING CONDUCTOR shall be not be less than( T) B6 }" W& j$ n/ X/ f
that of the conductors in table 3B (see 3.2.5), with a minimum of 1,0 mm2 in the path of
8 ^& f, c9 g: |' ?+ n) phigh PROTECTIVE CONDUCTOR CURRENT; and+ R, [5 j" i! {/ s6 t. ?
– one of the following labels, or a label with similar wording, shall be affixed adjacent to8 n( z, l4 u" r) g
the equipment AC MAINS SUPPLY connection:/ Y$ \) S. y7 r
WARNING
/ A. K( C9 \8 v, o$ cHIGH LEAKAGE CURRENT6 F$ {5 w+ t3 E8 Z2 H p6 H
EARTH CONNECTION ESSENTIAL
8 z" [; J4 E: ]8 d+ |5 @' lBEFORE CONNECTING SUPPLY
% @6 I2 `6 b7 r7 k/ C( X6 fWARNING
* M! P# X$ q% M# uHIGH TOUCH CURRENT
* B; g9 {! X T0 aEARTH CONNECTION ESSENTIAL5 H4 i! R; R: C& Q% @6 |
BEFORE CONNECTING SUPPLY |
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