DSH 432 Protective Impedance versus no-load voltage

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DSH 432 % v+ j0 i. `  r, r/ s: q& a3 _

Protective Impedance versus no-load voltage $ c/ P1 f- g$ f& f$ y' i

18f) ) X* v: A# S: w( c- c! j

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

6 V; P. q( r  _" i6 MStandard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 18f)
Sheet n°: DSH-432
Subject: Protective Impedance versus noload voltage
$ v8 \# [8 D/ K+ L7 D( A% V- i+ LKey words: Protective, impedance, earth, connection, no-load
Confirmed by CTL at its 39th meeting, in Cologne
) z* S3 C) J) W/ W! |9 sQuestion:
( B( j7 P" i) P( u# j4 [# S$ ?EQUIPMENT 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
! m% ]% m9 c5 d1 n: M7 {in contradiction to the required no-load voltage of 6 V maximum.
Decision:
7 t" K( J8 S2 x$ v. bMeasuring 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
can be done with one measurement. Requiring a measuring current of more than 25 A it shall be
; x' F  S0 ^# S3 A6 bsplitted up into two measurements. In this case, the impedance shall be determined first, using a
voltage not exceeding 6 V.
# D/ C$ F: ^) B$ \, S. rIf cross-sectional area of the protective earth connections cannot be determined as equal to the
2 }! x& t& r* @3 ?" k* |5 A% |& pone for the phase by measurement of the area, then measurement with current shall be from a
source with a higher voltage than 6 V.

7 Y- r8 f6 I9 g1 F; l7 U" j$ n