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|  DSH 4473 X) P. k4 ]* R* _0 @6 R8 x
% E0 @- G+ {! y$ k% `, \4 G* U7 _ | Disconnect device
- o6 B( c( ]+ c6 e" ~" k6 c6 ? | 3.4.6- N7 @- d) k2 f
| 60950-1(ed.1)6 _; X8 F& K! ?& Q1 `1 E- N w3 B
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Standard:
$ ]+ |( I$ w( D( A( y& Y+ {IEC 60950-1:2000, 1st ed
+ C0 V/ C2 v, H% |: U* i" G$ X* F8 L. LClause:+ U8 ^, ~5 @! L! t: W* C( E
3.4.6& m, D3 c. ?! F4 \ ? ?! k
Sheet No.1 F& }* }! V! ?0 r; Y+ `3 R/ s
447! V. P* J' z, Y; k1 y3 E
Subject:4 j% L4 @* \6 `3 M
Disconnect device3 x% g( Q' g$ d$ a5 ~
Key words:' G0 r" s& m- G( C% M4 y8 d5 y, `
DC mains supply
: M, }; X0 j3 y/ l& MDecision taken at the2 K r6 k" V& ~( O- H$ p
40th meeting 20035 }- g& H' x! R: P2 W) x& U
Question:: o8 G. g0 W) J# y6 b1 H7 B3 z
Equipment for building-in is supplied by power supply which has an output rating 24 Vdc, 40 A.- X6 k v8 T9 H$ D: H2 C; C% Q9 v0 ^% r
The power supply is 40 m far from end use equipment which contains above mentioned unit.
5 C4 e/ W2 O/ |! k4 qa) Do other test houses require disconnect device for such DC supplied unit?
! P$ P" }! D+ o( n8 |b) Do other test houses require contact separation of disconnect device 3,0 mm if supply voltage is, v' R" b" y* X; K
only 24 Vdc.
/ \1 q* ?" Y. ~' j' s! x+ {; e0 k/ NDecision:* m; @/ k5 X* n2 W5 a
a) Per 3.4.1: A disconnect device or devices shall be provided to disconnect the equipment from the
( E; O+ r0 ~% M* q8 Hmains supply for servicing./ h: z8 p: X+ v+ c
(This device can be an easily removable fuse for DC-mains-supply with non hazardous voltages).
1 p- p/ H S3 u! J# Ib) Disconnect devices in DC-Mains Supplies with not hazardous voltages shall have a contact" Q: \/ f( N& U; w# u
separation equal to the clearance for basic insulation.
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