DSH 432 Protective Impedance versus no-load voltage

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DSH 432 ' P# a2 G% C- ^

Protective Impedance versus no-load voltage

18f)

60601-1(ed.2);am1;am2 - I1 v' `/ P) G- c8 Q( z

Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
0 g- c* q/ j4 O4 @6 PSub clause(s): 18f)
Sheet n°: DSH-432
Subject: Protective Impedance versus noload voltage
Key words: Protective, impedance, earth, connection, no-load
Confirmed by CTL at its 39th meeting, in Cologne
Question:
- m7 u  }# \( `* o+ cEQUIPMENT for example having a rated current of 30 A require a test current of 1.5 times 30 A.
" T  H, H# k  a7 uWith a maximum impedance of 0.2 W the voltage drop has to be 9 V (0.2 W * 45 A = 9 V). This is
  W$ X# ~! m+ E2 E- [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
5 F) r% D& ?1 X! Hand cross-sectional area of protective earth connections. For a measuring current of 25 A both
4 X" R% Q# F% K0 R8 g+ C" J! Dcan 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.
$ K. \! n+ w) e  |If cross-sectional area of the protective earth connections cannot be determined as equal to the
0 m" A+ f6 Y  W& kone for the phase by measurement of the area, then measurement with current shall be from a
source with a higher voltage than 6 V.
; Z8 Z+ @7 a" X