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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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5.1.7 Equipment with touch current exceeding 3,5 mA+ G" R/ n! S1 |
For STATIONARY PERMANENTLY CONNECTED EQUIPMENT or STATIONARY PLUGGABLE EQUIPMENT7 |4 g6 _+ X# \5 e
TYPE B having a main protective earthing terminal, if the TOUCH CURRENT measurements7 \' n, ]8 z3 @1 i4 @6 l
exceed 3,5 mA r.m.s., all of the following conditions apply:# d8 g: \& _5 c: q4 W
– the r.m.s. PROTECTIVE CONDUCTOR CURRENT shall not exceed 5 % of the input current per& t) e: {. {/ L9 {# Q5 F5 g
line under normal operating conditions. If the load is unbalanced, the largest of the three
- g2 N$ |7 J3 [. H5 r2 D8 yline currents shall be used for this calculation. To measure the PROTECTIVE CONDUCTOR
/ F. M, w) a- v% a! {4 ZCURRENT, the procedure for measuring TOUCH CURRENT is used but the measuring, S1 S, U3 U/ B3 p
instrument is replaced by an ammeter of negligible impedance; and9 |& G4 m5 c3 Q4 t
– the cross-sectional area of the PROTECTIVE BONDING CONDUCTOR shall be not be less than4 p, T9 @$ T4 f/ q9 a& Z
that of the conductors in table 3B (see 3.2.5), with a minimum of 1,0 mm2 in the path of
0 g9 U1 p0 Y6 l* chigh PROTECTIVE CONDUCTOR CURRENT; and
; y( K3 l _3 x– one of the following labels, or a label with similar wording, shall be affixed adjacent to! y6 k3 K" ], N! W/ {/ G7 e; e
the equipment AC MAINS SUPPLY connection:
" j( d. \- J W) {$ bWARNING9 G' B' Z0 H; L# _" K
HIGH LEAKAGE CURRENT" R/ ~* ^' W4 u v4 N O
EARTH CONNECTION ESSENTIAL2 N# x, E0 S7 b4 Z/ C
BEFORE CONNECTING SUPPLY
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HIGH TOUCH CURRENT
8 H/ C; i# S: @9 P2 KEARTH CONNECTION ESSENTIAL' R& Z4 W2 h, B2 T/ D5 I U
BEFORE CONNECTING SUPPLY |
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