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|  DSH 4476 o# G, C. T8 L+ {
( n7 Y( j. a- Q' O* Z8 i | Disconnect device
) K; k8 ^1 _. r/ r) _3 C" { | 3.4.6
% Q# Y+ u( |8 Z( ] | 60950-1(ed.1)
( g% n& S6 [& F- n* l |
9 L* J5 }" c* f
Standard:
+ I3 r6 m5 H0 T7 O( I7 @IEC 60950-1:2000, 1st ed# E2 Z2 D' [& P" v
Clause:) d- M4 b# j/ `0 T
3.4.6+ s2 h. e6 x0 ~: K2 v+ A1 t
Sheet No.
+ J1 z4 Z1 |* t7 u( S0 L4478 R% `7 I* g* G g
Subject:9 A. n/ o7 T6 P9 j. Q
Disconnect device
/ o5 M0 D4 @, T4 EKey words:
9 I3 i7 l% h m1 ADC mains supply, {. A) m" V, w! R1 x& ]$ S
Decision taken at the
6 \8 D7 Y8 Q. z3 W: O40th meeting 2003
1 k# a0 V( s, E% ]) _& GQuestion:1 U: C& Q: Q$ L
Equipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.
0 m( X8 o- T; o! P. g' ^! nThe power supply is 40 m far from end use equipment which contains above mentioned unit.
' {# n8 R0 o0 |a) Do other test houses require disconnect device for such DC supplied unit?
$ q9 b0 y$ ^& P& Y9 ob) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is
& {- E. g5 O5 t" e1 Aonly 24 Vdc.
/ H3 i; F& a* ?, vDecision:
: H4 @1 K7 c0 {a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the
: p; l% ]7 r8 Z7 G( O! E3 lmains supply for servicing.
8 |* p( L% |. E+ O+ D6 M(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).$ P8 k9 q4 W' [/ \1 G5 U+ {
b) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact$ v9 C7 }9 i7 j" g P7 P
separation equal to the clearance for basic insulation.
) }' g, Z8 F$ L+ R5 f- \0 o3 [1 p3 l1 E) O
4 F: f5 B6 s' ^" D) p
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发表于 2012-11-6 16:52
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