|
BARRY:* ?/ r' t( ? w2 ?0 S- Z2 U" H, D
' w! B* d# G0 X" t- t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.1 {( s ?+ @, `; j7 f4 O# [
$ b7 c5 Y, ^- J1 f* K& v7 J1 l
T/ u' ]% E. f3 Y5.1.7 Equipment with touch current exceeding 3,5 mA
1 G) L; W: k, b: _( XFor STATIONARY PERMANENTLY CONNECTED EQUIPMENT or STATIONARY PLUGGABLE EQUIPMENT
- `$ V) |, M- e' {8 ]TYPE B having a main protective earthing terminal, if the TOUCH CURRENT measurements" n* d. V- P+ w# M5 k
exceed 3,5 mA r.m.s., all of the following conditions apply:
4 w1 G, ~. p4 ?0 {8 h– the r.m.s. PROTECTIVE CONDUCTOR CURRENT shall not exceed 5 % of the input current per( v) ~5 I: I* {, c
line under normal operating conditions. If the load is unbalanced, the largest of the three3 i! y3 L( \) j( C8 T
line currents shall be used for this calculation. To measure the PROTECTIVE CONDUCTOR
A, T# c" i# ?CURRENT, the procedure for measuring TOUCH CURRENT is used but the measuring9 y* j: @6 k& d: y9 ^; F
instrument is replaced by an ammeter of negligible impedance; and
6 \& W2 M% A8 g+ J; M% y; c, M– the cross-sectional area of the PROTECTIVE BONDING CONDUCTOR shall be not be less than
) Z- ^0 ` w7 h; D0 Bthat of the conductors in table 3B (see 3.2.5), with a minimum of 1,0 mm2 in the path of
; z" F* k3 \( o6 A9 vhigh PROTECTIVE CONDUCTOR CURRENT; and
* t9 e: Y: l: L# z' T% V* m* n– one of the following labels, or a label with similar wording, shall be affixed adjacent to
* `# O: F3 m" p9 q2 Xthe equipment AC MAINS SUPPLY connection:6 y: c# {8 J- o7 j+ p+ I
WARNING- ^' ?, @) j; Q) S4 Z. i! l5 {
HIGH LEAKAGE CURRENT
: @/ l& C2 h5 m! zEARTH CONNECTION ESSENTIAL" B+ |0 W2 @$ T' z9 L5 {* `5 @
BEFORE CONNECTING SUPPLY) B' {$ N3 W0 n: p' [3 r8 A
WARNING
, _+ y4 K \6 X) @% v+ k! iHIGH TOUCH CURRENT
% D: } E0 D" t7 UEARTH CONNECTION ESSENTIAL
( ~; z1 A0 F1 ]4 C5 \( |5 tBEFORE CONNECTING SUPPLY |
|