|
BARRY:
: {- u6 h5 N A# U& m" A a& ?( e5 V+ S+ b
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.
. I# q5 n9 X' i( ^) ^& y5 d) A$ _ r; t+ f( j2 b8 J
# X* ^" ?" g; M4 L+ H" f6 W5.1.7 Equipment with touch current exceeding 3,5 mA
) i- |! P1 L# m" KFor STATIONARY PERMANENTLY CONNECTED EQUIPMENT or STATIONARY PLUGGABLE EQUIPMENT# {" ^- h6 @1 q! H
TYPE B having a main protective earthing terminal, if the TOUCH CURRENT measurements
4 B/ Q: T3 p- v3 w0 Xexceed 3,5 mA r.m.s., all of the following conditions apply:4 @% r+ y9 U- A: H
– the r.m.s. PROTECTIVE CONDUCTOR CURRENT shall not exceed 5 % of the input current per) n7 o9 C0 w H H- S: x% q6 K
line under normal operating conditions. If the load is unbalanced, the largest of the three
# W/ S- ]1 R6 O8 C/ w; Dline currents shall be used for this calculation. To measure the PROTECTIVE CONDUCTOR
+ k- C- X) w9 P; J# Q* fCURRENT, the procedure for measuring TOUCH CURRENT is used but the measuring" p/ Y. _& j6 ?: o8 ~* t
instrument is replaced by an ammeter of negligible impedance; and
, \* P1 |3 \) n8 [$ T! e– the cross-sectional area of the PROTECTIVE BONDING CONDUCTOR shall be not be less than
6 s) w& Q8 z6 t: e z& H& Bthat of the conductors in table 3B (see 3.2.5), with a minimum of 1,0 mm2 in the path of
" @ P% c. }0 B6 Xhigh PROTECTIVE CONDUCTOR CURRENT; and
1 ?* [3 O$ F6 W" D6 g7 `) u– one of the following labels, or a label with similar wording, shall be affixed adjacent to2 g/ _" V8 E) q& `/ B& F3 K
the equipment AC MAINS SUPPLY connection:% P# }5 ^0 Q) A" ?9 i
WARNING: g, D" z$ d' V' T* {
HIGH LEAKAGE CURRENT
( {% y6 w1 u$ A% wEARTH CONNECTION ESSENTIAL9 Z7 V9 z0 ^% b8 v+ Z1 }1 `. K
BEFORE CONNECTING SUPPLY
& {+ F- H, N. D3 vWARNING0 y6 }2 t7 d$ H& Q. u6 A% i& C
HIGH TOUCH CURRENT
9 D" i9 d- a/ Y7 N, LEARTH CONNECTION ESSENTIAL8 ^/ q7 u$ z6 z$ Y3 W* q
BEFORE CONNECTING SUPPLY |
|