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|  DSH 447+ t) L C; Z, a/ g1 p
1 u4 y& t0 p: E+ ]* K2 C* P: h | Disconnect device1 l6 m3 v1 h" E7 N( b
| 3.4.6
3 A& b' \% ]! v1 n, u m | 60950-1(ed.1)
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Standard:: [6 | [0 u' p7 S% w
IEC 60950-1:2000, 1st ed
0 c/ ^/ y; V2 sClause:
6 R8 [& `: H9 J, i/ _, @, M5 u, k3.4.6. R" x3 w; ?! o+ a- s- H) Z
Sheet No.! a0 }5 Z, K) S% p! F; i/ j
447
; A W! l, X/ ~ |9 qSubject:& U u3 _4 p! Z1 X# n$ A! u
Disconnect device
: K& Y/ o _) d4 i3 R' b8 p1 uKey words:
* D! R* q$ s8 _3 ]$ [6 uDC mains supply
9 y( Q% B0 A/ ~Decision taken at the
u, {3 W/ _3 p, |7 G4 u3 u. V40th meeting 2003
( M) M% S6 B' fQuestion:
; h( p& A1 u" [$ `, ]' C- FEquipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.2 ~/ J1 Z* u/ F" N' X6 ?$ B
The power supply is 40 m far from end use equipment which contains above mentioned unit.
2 S. k( o7 x1 M, a7 t* ea) Do other test houses require disconnect device for such DC supplied unit?
* M5 ~4 H( C; x, x4 @. Zb) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is
{4 V4 ]% x( G. p) Xonly 24 Vdc.* h; r5 l$ U2 D; M$ L
Decision:5 Q& [5 e# r6 R( b4 H) _% b1 B- K
a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the+ f3 @' ~/ N( `" V
mains supply for servicing.
/ C+ r' i) n2 A3 [; n. u- W(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).6 Q t: H- J) ?; ?
b) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact- o* @3 g5 F9 E, Z! i( d1 n
separation equal to the clearance for basic insulation.
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发表于 2012-11-6 16:52
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