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2 R, A2 x" H3 N6 ?, B+ c4 rStandard(s)- (year and edition):
! m* Q% i* E. L) ]IEC 60601-1:1988 Ed.2 Am1+Am2) b q4 N+ N9 b7 j8 I
Sub clause(s): 16, 20, 19.2" ?* |1 p, z# {4 B
Sheet n°: DSH-410
0 f/ G. j/ G: E$ sSubject: Use of dc supply4 z- ]( {' H( K! E$ K- c. c8 g
Key words: dc supply, enclosure- g# d6 [; J3 a! U/ v
Confirmed by CTL at its 39th meeting, in Cologne$ ]' Y& {4 C5 m( X- T
Question:
8 l$ p% j4 a" f: a. m0 cSome EQUIPMENT is designed for use in ambulances and operated from the vehicle d.c.
; W5 n/ F3 T* m. |# L. S) @- }supply.with the negative side of the supply connected to the enclosure. Is this acceptable?! _7 a3 \' {& a/ R9 @9 p% c
Decision:2 C; e1 O! f% j' V7 e
Connection of the negative side of the d.c. mains to the ENCLOSURE should not be permitted. h' y9 z2 w Z2 p) w
The insulation between all poles of the supply and the ENCLOSURE must comply with 20.1 A-a13 `- c* S' K1 V, O4 {9 H# I9 N& w
and A-a2.& e% Q2 S( Z( A9 w) u/ t
Note: Vehicle chassis is considered to be protective earth.! o5 f' r1 G% b' }- ^7 S/ d, Z
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