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8.4 Limitation of voltage, current or energy
3 J$ R X' Z l/ M+ g! L8.4.2 ACCESSIBLE PARTS including APPLIED PARTS. K! J, g( c! f
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b) * The LEAKAGE CURRENTS from, to or between ACCESSIBLE PARTS other than PATIENT& O7 t8 r& |& \$ K" L7 j& f
CONNECTIONS shall not exceed the limits for TOUCH CURRENT specified in 8.7.3 c) when1 A0 b! g* O* H7 W) f
measured as specified in 8.7.4.
" r3 a2 Y+ H. |c) * The limits specified in b) above do not apply to the following parts if the probability of a/ c9 p( Y+ z! j, W8 B. d2 d
connection to a PATIENT, either directly or through the body of the OPERATOR, through which
5 N$ e D& X* }6 U) ba current exceeding the allowable TOUCH CURRENT could flow, is negligible in NORMAL USE,
: x' ]( A5 V0 Dand the instructions for use instruct the OPERATOR not to touch the relevant part and the
& F! f3 R7 P) c0 @1 s& e4 D! Y% r; hPATIENT simultaneously:
/ C. z% Z/ f+ F0 C' \+ f$ Y* s6 Y& e* G/ y
– accessible contacts of connectors; i1 o4 H; r$ k6 z) D; n2 E8 o
– contacts of fuseholders that are accessible during replacement of the fuse;' d9 ~. G& P$ C6 i
– contacts of lampholders that are accessible after removal of the lamp;) P/ D8 j Q8 l
– parts inside an ACCESS COVER that can be opened without the use of a TOOL, or where
' Y8 F) U; K8 J" X1 p( Va TOOL is needed but the instructions for use instruct any OPERATOR other than SERVICE
7 F) f, O, r9 [* GPERSONNEL to open the relevant ACCESS COVER.
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! I# _! b& M( d1 N" z! O+ pEXAMPLE 1 Illuminated push-buttons* m$ W% M5 j, K2 p6 @
EXAMPLE 2 Indicator lamps
- K' U. [8 `8 r! d) l3 |EXAMPLE 3 Recorder pens+ _! G- O7 v6 E# W$ ]8 v
EXAMPLE 4 Parts of plug-in modules
: X: }( }1 `/ k, L7 Z2 HEXAMPLE 5 Batteries
2 b& v# l- L" s$ Y! V
# S) `# K4 u3 m' {' @; z7 o8 Y- BFor such parts, the voltage to earth or to other ACCESSIBLE PARTS shall not exceed
$ ^9 g( [; W0 K! j' Q0 O42,4 V peak a.c. or 60 V d.c. in NORMAL CONDITION or in SINGLE FAULT CONDITION. The d.c." p, @5 o( j& K' D/ N
limit of 60 V applies to d.c. with not more than 10 % peak-to-peak ripple. If the ripple7 Y! ?" A) q' O5 D1 k* \
exceeds that amount, the 42,4 V peak limit applies. The energy shall not exceed 240 VA1 X2 C' C" r) X4 Z; p, i
for longer than 60 s or the stored energy available shall not exceed 20 J at a potential up; _3 u4 a( A8 m6 g6 Y7 R
to 2 V.
. _8 k2 w' [( L6 V) Q% t; }9 L; aNOTE If voltages higher than the limits specified in 8.4.2 c) are present, the LEAKAGE CURRENT limits referred
4 f) ^; M4 u8 ?& B. @1 X6 }, ?to in 8.4.2 b) apply., v( b1 F+ H5 V) a' {7 s* g4 R/ E
3 Z& J0 y& @- ?2 f mCompliance is checked by inspection of the RISK MANAGEMENT FILE, by reference to the) h/ _: x8 Y0 K% j) q/ F
instructions for use and by measurement.; X0 G7 |" y8 m; F2 t
# ^* @3 {- l0 Z* O! I A' b* l" O
我觉得新版本的IEC 60601-1:2006写的最明白了,只要在说明书中说明操作者在接触电池的时候不同时接触患者,电池部位的接触电流的限制是可以豁免的。当然风险分析还是要做一下的。 |
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