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+ P+ x: L, J0 x( M/ AStandard:
0 s( S8 z/ `2 r" i& [* ?IEC 60950-1:2000, 1st ed! j* N5 F/ P9 J: `6 M/ Y! }
Clause:4 ?$ t8 Y0 a2 R9 G% f$ V( A2 e4 }+ ~
3.4.6+ e% L9 B; ]* m+ O) F; ^
Sheet No.) ^) T, }9 D2 Z2 z: v$ G
447$ X' F$ ^- q# z. V f7 k; I
Subject: j0 m9 C4 P% X$ g8 `4 U/ _
Disconnect device
/ E# D- F$ D; A% N$ g0 c$ yKey words:' L* _8 @: g/ X+ }+ q7 y
DC mains supply9 b4 _% w# A0 T7 `3 W
Decision taken at the
& q9 A4 |8 [; Y2 Z. G$ v+ p+ I4 I8 M40th meeting 2003
5 z) R$ _+ S( e- \Question:
- x: E, q: j, i$ u; w& p) K8 ?Equipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.
, w4 ~$ I7 W8 f6 F7 SThe power supply is 40 m far from end use equipment which contains above mentioned unit.
$ a& A, r8 M9 sa) Do other test houses require disconnect device for such DC supplied unit?
9 L! F0 C& \# D: ~- M& wb) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is1 {8 |- E% B1 r7 a$ F" _0 M2 y0 D
only 24 Vdc.& j& _3 ~) \! H2 [. N4 ?( Y. c
Decision:" ^6 M8 A Y! @& B4 e+ b& M
a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the
: ]8 d* A- K, }, C5 O3 Umains supply for servicing./ S8 z* s& s1 o( ?4 q" D( k+ B
(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).
% p% |9 Q; x) K" ? @8 L# [0 Q$ o$ eb) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact
) H! h; X: }7 \separation equal to the clearance for basic insulation.
: a' ]2 |( Z' j; {; t, b9 Z$ b4 j# L: t
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发表于 2012-11-6 16:52
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