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BARRY:: j0 w$ ]7 ?- h# m5 a: ]5 ^, D
) a Z4 _9 x0 N! C9 }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.; V' v1 K. N0 f9 u( K
' ]) l: _) Q( n$ N$ o
! i/ J/ N+ e' u# a5.1.7 Equipment with touch current exceeding 3,5 mA
1 O5 h0 ?3 z9 l9 u( i% Q/ hFor STATIONARY PERMANENTLY CONNECTED EQUIPMENT or STATIONARY PLUGGABLE EQUIPMENT
/ u: {5 Q$ Q7 t& R! J; [8 c4 kTYPE B having a main protective earthing terminal, if the TOUCH CURRENT measurements" H- g6 j. A U3 m6 @7 c; l! ^' z
exceed 3,5 mA r.m.s., all of the following conditions apply:
$ L/ Y A6 r0 W5 D. T$ j* G5 ]5 E– the r.m.s. PROTECTIVE CONDUCTOR CURRENT shall not exceed 5 % of the input current per5 J+ l' a$ C& W X- H3 Y
line under normal operating conditions. If the load is unbalanced, the largest of the three# J7 Z8 V* H2 O* U$ J- V
line currents shall be used for this calculation. To measure the PROTECTIVE CONDUCTOR
* Q8 V9 P8 x3 g' S4 X5 XCURRENT, the procedure for measuring TOUCH CURRENT is used but the measuring
2 Y2 H, Q3 m. U: R2 Linstrument is replaced by an ammeter of negligible impedance; and
* \; X3 @" `# @7 F– the cross-sectional area of the PROTECTIVE BONDING CONDUCTOR shall be not be less than/ e$ x1 X x8 c8 z4 V1 I9 b
that of the conductors in table 3B (see 3.2.5), with a minimum of 1,0 mm2 in the path of8 O- M o, b# u- n8 }4 Y( U$ r. v8 W
high PROTECTIVE CONDUCTOR CURRENT; and0 X2 ~) F; @: K5 b5 K
– one of the following labels, or a label with similar wording, shall be affixed adjacent to! J3 d8 t0 V& p8 X% G, ?- |
the equipment AC MAINS SUPPLY connection:
& _! O# _% q; {' dWARNING
1 w' ~4 }( u0 E! d. c% rHIGH LEAKAGE CURRENT3 h6 \8 d2 L4 n3 a" C2 j/ [
EARTH CONNECTION ESSENTIAL
' }, y8 j) i* k* f( T- cBEFORE CONNECTING SUPPLY8 j% v5 Z; |7 a7 s1 t
WARNING$ V5 \- \! V/ s
HIGH TOUCH CURRENT
. T* r+ V; X5 e, ]EARTH CONNECTION ESSENTIAL
) f5 E( b, |/ mBEFORE CONNECTING SUPPLY |
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发表于 2007-5-19 16:39
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