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Standard: 3 b; t& n" Z# E$ Z$ X4 o& LIEC 60950-1:2000, 1st ed' n& p+ m! p, I z2 \9 j8 g- c; w
Clause: 7 q7 @' k- [: E' P2 C- {3.4.6! t2 N% Y @- H0 {5 g
Sheet No." r- K: R7 C3 C- }/ h+ o! y
447' p+ J2 o$ S6 X& _( D1 B
Subject:- A5 p( T+ o& h. T
Disconnect device/ o1 @' a: }" M; Y6 z8 P
Key words: 5 D& A4 s6 N% ^- U$ m8 [8 FDC mains supply4 |7 z" R' T; O: s( h7 U u
Decision taken at the 2 N0 d! U% q: }5 i4 b" X40th meeting 2003 ! j! l& L1 X" V/ `5 RQuestion: + @3 q! e, O$ h1 h; y( B. o8 mEquipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.0 |( Q* D: I5 t1 T8 U/ I( o, |
The power supply is 40 m far from end use equipment which contains above mentioned unit. & U1 `5 f& q) z0 t/ n7 {# R5 }; |a) Do other test houses require disconnect device for such DC supplied unit?4 q! T3 }5 R8 O1 T( X5 E/ ^% U
b) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is 4 N1 M9 ]4 Q9 R/ h2 g5 ponly 24 Vdc.! c9 X8 A9 E5 v5 f3 u9 a. P( {
Decision:' [" v# @9 p1 w0 [/ B! p
a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the0 u" I# n* N* l0 R( h% X4 O I- i# D
mains supply for servicing. % _/ ^1 }9 A) j7 `( d) p(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).6 R; C# N( h1 O& r1 y1 U, |
b) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact3 ^# ^% Z6 `8 P
separation equal to the clearance for basic insulation.( _. R1 O+ o1 F! `" }7 Y
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[attach]77161[/attach] ! B, X9 K" X) {
DSH 447