DSH 418 Load resistance in relation to load current

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DSH 418

Load resistance in relation to load current

57.9, 57.9.1

60601-1(ed.2);am1;am2

Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 57.9, 57.9.1
6 ~9 f! ^5 A! o7 p% m+ C2 w! VSheet n°: DSH-418
$ S$ E" l" a# c5 u3 {* B& u. pSubject: Load resistance in relation to load current
; y: `/ E/ M2 e7 DKey words: Load resistance, load current
% g0 E* {, F$ S* s/ q! ]/ |Confirmed by CTL at its 39th meeti ng, in Cologne
Question:
- X) f& W5 n5 t5 U1 w5 UPractically the test is performed with the winding under overload connected to a resistor with
* ]3 L  {; P" @3 H8 k7 F9 ]  ?5 C5 hthe resistance value that yields the correct test current in accordance with Table XX. As the
$ t; k& I- C0 H( B; ~+ Qwindings get heated during the test their resistance increases and one has to decrease the
% \8 E1 @! P- O2 k7 T0 k8 Nvalue of the load resistor to keep the current in the fused circuit in accordance with Table XX
# \  J6 k7 W+ k/ V0 E1 Y1 i) tduring the test. Since the decrease of current is a result of the increase in the winding’s
; t; F8 ?1 ^9 Ctemperature, it seems to be an unrealistic fault condition to keep the current in the fused circuit
2 r1 P1 [( j# V9 Y4 f- P) I1 Y' D+ gunchanged instead of keeping the load resistance unchanged.
Decision:
The test load current must be maintained at its original value

& k" q3 Y: G. \( i