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|  DSH 447
! v; x8 V5 `7 ~$ Y4 a W- d' \) Z+ ~; n& W
| Disconnect device$ X+ G. T2 N: h- m
| 3.4.6
2 @' e1 Y5 a" h- y7 `6 ]! \ | 60950-1(ed.1)
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Standard:
4 Z0 o' n5 M7 k- l- h2 ^) LIEC 60950-1:2000, 1st ed8 B0 O! @$ h! Z8 e/ G% C" E: h" Q
Clause:( Z# ], }" M; [& ?4 g8 R. g8 M
3.4.6
- w5 |( q3 p; |* i7 CSheet No.+ @3 ?9 k2 q2 T" t
4478 B$ m: G% V3 w2 y" ~' H
Subject:( w6 \, D9 r) k7 V
Disconnect device$ M5 O6 I- I% R$ H5 v2 s
Key words:" o; n7 j4 ]/ l2 Y
DC mains supply
; S( ~" m* t- z; ?& Q) O) {1 @Decision taken at the
0 A- r/ U) X6 j40th meeting 2003+ G) W* G6 J& O- A; b1 y
Question:7 q+ |: ^; c0 R7 u2 B
Equipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.
( z6 Y4 b/ n$ P$ Y4 M% z6 YThe power supply is 40 m far from end use equipment which contains above mentioned unit.' H8 S6 K, G1 K' S
a) Do other test houses require disconnect device for such DC supplied unit?
1 K( Z; i: _# F1 v8 {b) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is
9 ~: M/ D; |4 z( conly 24 Vdc.
- l+ A& X+ m9 qDecision:. ]2 c8 c' p. F. _
a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the, Q+ l- Q7 o# k( \6 }2 n
mains supply for servicing.
$ _" E, K" R. H N; X: n(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).
, ?& [& ?2 B/ D6 k$ b$ _: Y0 f) n- Sb) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact
) K( K& |/ H. jseparation equal to the clearance for basic insulation.
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