1 f- c% V4 |3 S$ b# z" ]Standard:. G/ H* M, r2 q9 I, p
IEC 60950-1:2000, 1st ed * \: v/ ^ E" Z7 d b0 z3 N1 g+ dClause: " M# u& `0 v( }3.4.65 C7 p& P- b9 n
Sheet No. - N$ h7 {0 ]/ Q/ q' m$ K447$ v$ o2 q0 e8 L* A2 u3 U" N
Subject: " w" Q' P9 |& n( U# t" p0 [+ oDisconnect device4 J/ G$ P* r4 I
Key words: * E/ |9 |. _" M% {+ q! H% tDC mains supply8 T! S' C4 `+ g5 o
Decision taken at the9 c E3 o1 t# H& _( A# ]
40th meeting 2003; ~2 e1 `7 T5 K" F4 D
Question: " |5 F7 [$ H) @3 ~. }0 CEquipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A. 3 a; J5 D; A/ f8 \( P) m, D2 ZThe power supply is 40 m far from end use equipment which contains above mentioned unit.0 r9 K* x. f. p9 L" q
a) Do other test houses require disconnect device for such DC supplied unit? # P& N" R3 q. ~9 R( T0 R: zb) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is X( f5 s: |8 m" c- ]only 24 Vdc.1 h5 N" C8 H6 g- v
Decision: ! }" }7 B2 T; Ua) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the0 p" R9 ?5 U& i: P/ x
mains supply for servicing. ' z9 E6 O9 i3 W. I5 P: {(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages). 7 `0 E( D* T$ v6 M2 @b) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact( ]5 Z% h! [ F& s E
separation equal to the clearance for basic insulation.7 v: j4 |: `, o( }. v$ K7 G
DSH 447* F6 }5 A& c$ d7 w