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BARRY:
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5 s: x6 m) E& }# h. N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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7 A6 c ]* ~, E- U) b. w5.1.7 Equipment with touch current exceeding 3,5 mA) c! c O+ d& y$ ^0 Q
For STATIONARY PERMANENTLY CONNECTED EQUIPMENT or STATIONARY PLUGGABLE EQUIPMENT
) o r/ _- z2 i p6 yTYPE B having a main protective earthing terminal, if the TOUCH CURRENT measurements! W3 B: g! a* q# Y8 b
exceed 3,5 mA r.m.s., all of the following conditions apply:
& E! i8 @0 d( x! U7 w– the r.m.s. PROTECTIVE CONDUCTOR CURRENT shall not exceed 5 % of the input current per/ H. y% M& e! r: C3 g
line under normal operating conditions. If the load is unbalanced, the largest of the three ^1 C1 L m: D4 G; b/ ~6 O7 H" k2 ]
line currents shall be used for this calculation. To measure the PROTECTIVE CONDUCTOR9 P7 k& s: K* N3 |( F
CURRENT, the procedure for measuring TOUCH CURRENT is used but the measuring7 N! ^" L7 d) p ]6 N
instrument is replaced by an ammeter of negligible impedance; and& f" n* H z/ E. Q p* a
– the cross-sectional area of the PROTECTIVE BONDING CONDUCTOR shall be not be less than
0 Y& F6 p5 S) G7 M M5 Lthat of the conductors in table 3B (see 3.2.5), with a minimum of 1,0 mm2 in the path of
! [# n6 a+ e y* X& rhigh PROTECTIVE CONDUCTOR CURRENT; and: F: I+ F+ Z8 |, N D
– one of the following labels, or a label with similar wording, shall be affixed adjacent to* O# K2 m, n$ l9 ~% B: r9 F( `% q
the equipment AC MAINS SUPPLY connection:; `9 r' g# H) N/ Z- b* B
WARNING
: Z5 L* k' F7 ~7 bHIGH LEAKAGE CURRENT6 F6 [2 A& \- c) T& C# a
EARTH CONNECTION ESSENTIAL7 c7 e- D r( {0 J
BEFORE CONNECTING SUPPLY
, ]8 |5 A8 |+ `WARNING
" z, s2 c4 c$ j- k7 yHIGH TOUCH CURRENT# s1 V3 ?/ V8 ?: g& L7 P" I
EARTH CONNECTION ESSENTIAL' }, X! K0 M) B. x& `4 U" d5 k: @# ?
BEFORE CONNECTING SUPPLY |
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