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BARRY:2 w6 r: }3 [' R F
1 l" a9 i% G* d: Y/ [
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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- y7 o* ]- \+ ~9 z- g! K5 n5.1.7 Equipment with touch current exceeding 3,5 mA
3 G5 ~( ~3 B$ z% iFor STATIONARY PERMANENTLY CONNECTED EQUIPMENT or STATIONARY PLUGGABLE EQUIPMENT* x+ j- y; k; w: F- J4 X Z
TYPE B having a main protective earthing terminal, if the TOUCH CURRENT measurements" d; p2 e9 U6 |1 e
exceed 3,5 mA r.m.s., all of the following conditions apply:7 [: |/ C$ y2 B [" [6 `# {9 O
– the r.m.s. PROTECTIVE CONDUCTOR CURRENT shall not exceed 5 % of the input current per
. v6 j0 r+ t D* _8 h7 bline under normal operating conditions. If the load is unbalanced, the largest of the three
1 L9 j, d0 J1 [" C9 E# T" Lline currents shall be used for this calculation. To measure the PROTECTIVE CONDUCTOR
9 g- E1 c; p& b* Z& m! V0 wCURRENT, the procedure for measuring TOUCH CURRENT is used but the measuring
; |6 v8 N+ n5 }; a5 j* Zinstrument is replaced by an ammeter of negligible impedance; and
8 n4 i" N$ C' ?( ?, I– the cross-sectional area of the PROTECTIVE BONDING CONDUCTOR shall be not be less than p; J7 P3 N+ b6 f
that of the conductors in table 3B (see 3.2.5), with a minimum of 1,0 mm2 in the path of
- P' [- N2 |! jhigh PROTECTIVE CONDUCTOR CURRENT; and
. y5 p; Z* x2 Y/ z& ], J2 c1 V5 K! I– one of the following labels, or a label with similar wording, shall be affixed adjacent to
; D1 }; l8 J7 b/ Y: ^5 Q, ethe equipment AC MAINS SUPPLY connection:( _, F' U: f8 d* T" ^+ ~+ `# s
WARNING- x8 V+ [3 S# g; |( q4 C0 U% a( d j
HIGH LEAKAGE CURRENT7 B. k& J2 t9 |" h
EARTH CONNECTION ESSENTIAL
; i; C( m" q$ u4 B# z. nBEFORE CONNECTING SUPPLY+ S0 }7 q/ c) n
WARNING
5 _; O& v( u" d. _' ^HIGH TOUCH CURRENT
( ]8 ^! |2 `9 a% d) @: }! H; DEARTH CONNECTION ESSENTIAL2 [6 C+ ?0 P; t- i) D
BEFORE CONNECTING SUPPLY |
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