DSH 432 Protective Impedance versus no-load voltage

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DSH 432

Protective Impedance versus no-load voltage / \( O% @" Q: m

18f) / u  h$ \6 B* R( h+ W; A

60601-1(ed.2);am1;am2 4 Y& {  n7 D8 @$ l: n3 V

6 [2 ?+ r) G. W. GStandard(s)- (year and edition):
; ], j# q! Q9 T. ?1 i7 J* hIEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 18f)
Sheet n°: DSH-432
Subject: Protective Impedance versus noload voltage
" l) ^9 O( o/ L' o' u. cKey words: Protective, impedance, earth, connection, no-load
Confirmed by CTL at its 39th meeting, in Cologne
9 z: L. ^% J8 [1 y) ]Question:
EQUIPMENT for example having a rated current of 30 A require a test current of 1.5 times 30 A.
( @" W# u/ |/ P) m. C- h7 [With a maximum impedance of 0.2 W the voltage drop has to be 9 V (0.2 W * 45 A = 9 V). This is
in contradiction to the required no-load voltage of 6 V maximum.
3 ~- `8 v& B2 N) L( I# CDecision:
Measuring the protective earth connection has in fact two reasons. It is to determine impedance
) O" ~- F# B' zand cross-sectional area of protective earth connections. For a measuring current of 25 A both
can be done with one measurement. Requiring a measuring current of more than 25 A it shall be
splitted up into two measurements. In this case, the impedance shall be determined first, using a
voltage not exceeding 6 V.
If cross-sectional area of the protective earth connections cannot be determined as equal to the
one for the phase by measurement of the area, then measurement with current shall be from a
source with a higher voltage than 6 V.
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