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|  DSH 410
% q! ]: D ?, X* c5 l+ O7 U, M' s" S/ l# s; L" ]
| Use of DC supply7 p, u' L2 ]3 s+ k; D
| 16, 20, 19.2
8 ?: {6 i6 m/ \; ]! ~% P | 60601-1(ed.2);am1;am2- [) a& \8 ~, s% o5 S/ b
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# t9 c Z# n. mStandard(s)- (year and edition):
/ M( i9 G2 |4 A8 {) IIEC 60601-1:1988 Ed.2 Am1+Am23 E! f" I' {0 q8 _; M
Sub clause(s): 16, 20, 19.2
8 e2 V e* w* s3 Q! ISheet n°: DSH-410
& D3 }. s9 }! A4 I! O& DSubject: Use of dc supply+ t( u* K$ w. J H" c' a
Key words: dc supply, enclosure; v c/ w1 P. @+ |2 _' \
Confirmed by CTL at its 39th meeting, in Cologne, G/ g. _7 N7 R+ [
Question:$ b6 p) G/ r% T$ O ?! X
Some EQUIPMENT is designed for use in ambulances and operated from the vehicle d.c.
9 W* y* C7 ?% L% f! isupply.with the negative side of the supply connected to the enclosure. Is this acceptable?
$ t9 L# T7 X" ? x/ n# y' ZDecision:6 G2 u: `- j \" ?0 U9 d: }/ W
Connection of the negative side of the d.c. mains to the ENCLOSURE should not be permitted.
# Y: r2 f% h& a. ]The insulation between all poles of the supply and the ENCLOSURE must comply with 20.1 A-a1, J# `! O3 H" Q! _, {
and A-a2.
$ q) }8 u! w2 \! C" YNote: Vehicle chassis is considered to be protective earth.8 R( R( D4 _# [7 ]( G l5 i
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发表于 2012-11-5 11:32
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