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: |8 Q; K( {+ z- l; G8 U% FStandard:
- [* O3 I6 K2 f* {* t8 K/ ^IEC 60950-1:2000, 1st ed
4 c4 Q, ~# `5 f$ x) J' mClause:! ?8 q: h7 R: K" t: T0 C
3.4.6' z5 I: D7 e' _' n! R
Sheet No.
- U, ^8 ^( J: ~5 X6 ~% z447
9 \' E) y. v% w9 KSubject:
8 [6 x2 q& m D( X+ ]. }) m2 GDisconnect device q, r9 _5 }6 r* R6 k: c
Key words:+ [: _0 I; j x/ ]1 S. [0 G
DC mains supply/ W( l; l: G9 U! p+ w5 f
Decision taken at the6 F& S* L9 P5 v
40th meeting 20037 Q# U+ w# h# O0 M/ X3 T
Question:
$ |; l6 F# I# B; x/ i G" ]) w3 y" }Equipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.
. R- A6 E# L; u% w6 c; f, pThe power supply is 40 m far from end use equipment which contains above mentioned unit.1 `$ W8 q1 ]1 k- x! U
a) Do other test houses require disconnect device for such DC supplied unit?9 g0 b; X6 E3 [) t) R7 `/ A
b) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is
. g5 i1 O# g! A$ S! m2 O$ j2 [' }only 24 Vdc.* L# m; I) |6 s- t6 D; d
Decision:
& b9 y8 q( m$ pa) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the
! V( _: D" N( Kmains supply for servicing.
, T( t7 U$ ^& t(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).6 a- s' |+ M) l+ `+ Y
b) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact0 B b) P$ G8 Y6 A" ]$ _
separation equal to the clearance for basic insulation.6 Z( h1 D. u3 C$ p! S5 o9 x" t9 X
# q, A; n& w, R& M* N% ^5 K7 Y
$ _5 A. G8 M0 Q3 H' z( F8 q |
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