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|  DSH 447
7 c0 p; d) ^" n1 Y
% @4 S' }! `6 `9 y) N" M8 m& B | Disconnect device
, f! s. c" n+ k" F5 s9 S | 3.4.6
. t) C- Y8 y2 ?5 f | 60950-1(ed.1)
$ U& \; Z: T% R; T, k Y1 H |
6 d+ z! x' r3 ^; }3 w' z5 n, K
Standard:$ ?% p- l/ ?1 Z
IEC 60950-1:2000, 1st ed
W+ i5 b- z, J& W; Y* GClause:
2 U4 A8 q! t% D' ~3.4.6- R7 B: v2 o1 }7 `+ S% u
Sheet No. f. I% U+ c8 Y8 H. M3 O5 g
447
9 m& x/ q4 P+ d6 USubject:
+ v0 R3 g: G# f- S: @Disconnect device- ^7 A8 W+ Z0 N3 Y
Key words:
3 H/ N# e/ T' {' jDC mains supply( A3 q( ?/ V- x
Decision taken at the
$ R0 e, X( K; U% r2 G40th meeting 2003* }+ ~+ n" b0 `
Question:
1 t1 g& o& [: \/ Z& @' T yEquipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.
6 @# j9 I4 ?! }& NThe power supply is 40 m far from end use equipment which contains above mentioned unit.
9 |$ z# W. }$ ?; X Ja) Do other test houses require disconnect device for such DC supplied unit?7 C' K8 L7 O! H9 c
b) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is! `- \: a! }: x G
only 24 Vdc.
, @' s+ ~* X4 {5 o" w: C" \Decision:# _/ G6 D# a5 _7 f1 D1 y# ]# K
a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the
# E% L* K3 x- M% F) {! J8 `mains supply for servicing.
0 P, T _; X, @1 s# b; |(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).
2 F6 N6 W8 z$ g" I/ o- K8 _. v+ x5 Xb) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact
( W( b" @9 P8 R' r0 R8 Sseparation equal to the clearance for basic insulation.
( t) E' \7 w! W2 \: e' F# m- f' C/ i
7 y/ g2 o8 J1 q2 Y) ?* Y. ]& }
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发表于 2012-11-6 16:52
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