|
|
|  DSH 447, Q. s {9 d4 T
2 a0 T% ?* a) S
| Disconnect device. }4 i: [) Z+ @! U* M7 a. Q9 z
| 3.4.6. T V. w; A; j: [# c* d
| 60950-1(ed.1)$ i/ ]+ d& y- k( t0 g3 E( M
|
$ E0 d( g4 v+ U0 ]# J4 v0 }6 \Standard:. f* H0 r4 f' A* X* L$ m0 ~
IEC 60950-1:2000, 1st ed( q( l! ^* E2 Y# t
Clause:
$ e0 d6 r( @" [& C! z3.4.6
2 z0 \8 J8 r x$ W8 ISheet No.
6 t& Z: T( w2 L/ H3 h! B447
m* J+ k# T, F$ p- d" CSubject:
2 w; R' ^" y0 x* [/ E. ?) vDisconnect device$ `2 d8 d8 Z! V7 d- S8 F# I
Key words:
; K# A; B4 p. _; H/ kDC mains supply/ D5 V V, k; L* d1 i1 s6 R
Decision taken at the5 Z! c, d) w7 Y5 f0 X9 ^" Y
40th meeting 2003& T' ?+ S( W& |5 ^3 N# M
Question:5 C3 t' j4 o; j7 P" i' V% a
Equipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.6 ?' V1 j+ B1 F1 [, \ P
The power supply is 40 m far from end use equipment which contains above mentioned unit.4 H$ ], t5 }" }: e! E- c
a) Do other test houses require disconnect device for such DC supplied unit?# }4 x7 p; l, {; D `5 I$ O3 d) n
b) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is& [+ {$ I. C4 z1 G1 w4 a/ W5 L
only 24 Vdc." ]* [1 X2 p z2 l9 d* R
Decision:
9 g6 _8 {6 [2 g! S" {: m- |0 _a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the
! ~$ P* ~# {4 W* g$ `mains supply for servicing.
% k; q6 u5 d- _(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).
! @% x5 p! h0 g0 n, ?4 S9 p6 cb) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact% x, N- y7 r) h8 w& z5 M
separation equal to the clearance for basic insulation., W: {0 \0 R* H- K# y( w
0 D" l/ q& Q: B0 @
. l* }- \7 c2 K% q l1 D |
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发表于 2012-11-6 16:52
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