DSH 432 Protective Impedance versus no-load voltage

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DSH 432 6 ]# ?% [* m) [6 d% z

Protective Impedance versus no-load voltage

18f)

60601-1(ed.2);am1;am2 " W) q; a5 m8 [

7 r+ {7 I) E" _. b% PStandard(s)- (year and edition):
# }! s& Z7 d) Z$ QIEC 60601-1:1988 Ed.2 Am1+Am2
! H! Z  E2 q) H* ?% }: m; d' G4 iSub clause(s): 18f)
+ F9 Q6 \, L3 H$ e, O) oSheet n°: DSH-432
# k3 e) H# ?* L) G' _Subject: Protective Impedance versus noload voltage
Key words: Protective, impedance, earth, connection, no-load
5 i2 n; T1 H2 s# MConfirmed by CTL at its 39th meeting, in Cologne
Question:
EQUIPMENT for example having a rated current of 30 A require a test current of 1.5 times 30 A.
8 Z6 t9 o9 z% p; }# Y3 ^6 JWith a maximum impedance of 0.2 W the voltage drop has to be 9 V (0.2 W * 45 A = 9 V). This is
2 j! Y/ r' [' b( f1 hin contradiction to the required no-load voltage of 6 V maximum.
Decision:
" R% X4 n; ~) `2 U* P: sMeasuring 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
  [, u" J& ~5 Z" U- E' |can be done with one measurement. Requiring a measuring current of more than 25 A it shall be
* G7 o1 t$ c# r7 W; J# B- p6 a9 osplitted up into two measurements. In this case, the impedance shall be determined first, using a
voltage not exceeding 6 V.
/ o" n- ?8 S6 I/ F# hIf cross-sectional area of the protective earth connections cannot be determined as equal to the
/ m2 ]0 H, G# h% wone for the phase by measurement of the area, then measurement with current shall be from a
( Y% b* O4 }6 i& m! D; u; asource with a higher voltage than 6 V.
. p; }  q' W! |2 A

( G8 G  s4 q0 O, T* h4 H. _+ p