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Standard:
7 }5 t, t! O0 G3 fIEC 60950-1:2000, 1st ed
$ r* H5 J' K! Y H# hClause:+ N8 @: D+ H4 r) j. `* |
3.4.6! x6 A5 r" r! s* J' \4 y3 V/ Z
Sheet No., M2 _" ] @+ o6 E/ }/ H/ J
447; C& ^1 r5 a; m1 k- Y- \
Subject:. G" V; i2 x3 b y
Disconnect device
$ [( ?7 H" |0 YKey words:
9 w6 ^' Y8 ~+ c+ }DC mains supply
( Z" o1 \2 b: h) C9 g- RDecision taken at the7 H6 h3 q+ o9 v& g( }+ o g( ^% J. P
40th meeting 2003
. g: F5 D8 `3 ^; I7 i. gQuestion:4 y. F+ F) Q: z, }, }% z
Equipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.
8 C' z/ O( A2 E3 _5 K3 ?0 b* HThe power supply is 40 m far from end use equipment which contains above mentioned unit.
5 n$ V: k# G; X ?7 Ja) Do other test houses require disconnect device for such DC supplied unit?5 s6 k1 m4 e; \- Q% g. Y( U/ c
b) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is
x1 B$ G9 o ~5 W: n, gonly 24 Vdc.+ c$ ^# G6 q, w
Decision:) \' I4 T$ p3 Y: {. T
a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the
3 x! J) _$ m+ Y, T! Z2 Z: Ymains supply for servicing.
+ l1 Q0 E; ^' ?$ r(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).' v" q& ?8 ]. c8 O" ?$ a7 }
b) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact* H/ v2 I5 k2 r l4 {/ G/ m/ u( t
separation equal to the clearance for basic insulation.
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发表于 2012-11-6 16:52
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