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BARRY:9 i" o) t2 g0 u) G4 K, Q
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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
0 @* \: `! g2 s4 n& r( kFor STATIONARY PERMANENTLY CONNECTED EQUIPMENT or STATIONARY PLUGGABLE EQUIPMENT
3 y$ A$ C. j4 H( T* qTYPE B having a main protective earthing terminal, if the TOUCH CURRENT measurements* B7 @+ Z+ G8 z
exceed 3,5 mA r.m.s., all of the following conditions apply:
' P: O. X t9 @- X( D2 b– the r.m.s. PROTECTIVE CONDUCTOR CURRENT shall not exceed 5 % of the input current per
9 ] N2 z" u+ q+ Sline under normal operating conditions. If the load is unbalanced, the largest of the three2 p, U& q; k, W/ p
line currents shall be used for this calculation. To measure the PROTECTIVE CONDUCTOR" W$ P+ |( d# h# F/ l- c
CURRENT, the procedure for measuring TOUCH CURRENT is used but the measuring- C9 b5 e$ ?5 G$ H4 r ~* `7 d
instrument is replaced by an ammeter of negligible impedance; and O& N( R: H* ]" S8 S' L
– the cross-sectional area of the PROTECTIVE BONDING CONDUCTOR shall be not be less than3 A' b7 f, @% l1 S3 T7 q
that of the conductors in table 3B (see 3.2.5), with a minimum of 1,0 mm2 in the path of/ ~. r: I1 g; Y' Y
high PROTECTIVE CONDUCTOR CURRENT; and. C* A9 N5 v. e5 t7 F
– one of the following labels, or a label with similar wording, shall be affixed adjacent to$ c; N% J( l3 R. X
the equipment AC MAINS SUPPLY connection:: s( s' a: J6 V) [ d# ^
WARNING
( H# F2 g$ c3 \% ~HIGH LEAKAGE CURRENT
' E7 l; H v8 y% l% uEARTH CONNECTION ESSENTIAL6 `4 \' M" r' T9 g8 f9 _" J
BEFORE CONNECTING SUPPLY
! |# h2 G& P# FWARNING
8 E% ]) a# K- q" O) A. r& @HIGH TOUCH CURRENT
7 b: T$ j7 x" u2 W8 AEARTH CONNECTION ESSENTIAL* Q. p2 ]+ Z3 v
BEFORE CONNECTING SUPPLY |
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