DSH 432 Protective Impedance versus no-load voltage

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DSH 432 % n& i, g0 Q3 X3 g1 V

Protective Impedance versus no-load voltage

18f)

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

+ c9 S5 p6 a5 u( ]Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 18f)
Sheet n°: DSH-432
5 G' p6 L. W& ySubject: Protective Impedance versus noload voltage
1 [1 |/ ^$ F& t4 MKey words: Protective, impedance, earth, connection, no-load
. _/ T* I( v5 P( V/ g; g- J9 fConfirmed by CTL at its 39th meeting, in Cologne
* Y( q1 Z$ Q' p6 H5 \Question:
2 F2 }$ [7 O1 X. J; LEQUIPMENT for example having a rated current of 30 A require a test current of 1.5 times 30 A.
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.
Decision:
Measuring the protective earth connection has in fact two reasons. It is to determine impedance
and cross-sectional area of protective earth connections. For a measuring current of 25 A both
1 R: `2 B5 F8 O) U% v) G; ycan be done with one measurement. Requiring a measuring current of more than 25 A it shall be
! l) p; v! I, Q$ J- g6 [splitted up into two measurements. In this case, the impedance shall be determined first, using a
' @2 u  J+ o( _% I2 Z& fvoltage not exceeding 6 V.
. d% @7 r2 P. U" eIf 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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