METREL MI 3122 Instruction Manual page 59

MI 3122 Smartec Z Line-Loop / RCD
Z line impedance
Isc ........... prospective short-circuit current
Lim .......... high limit line impedance value.
Prospective fault current I
where:
Un Nominal U
L-N
Scalling factor ...... Correction factor for Isc (set to 1.00).
is calculated from measured impedance as follows:
PFC

I
PFC
Z

L N
or U voltage (see table below),
L1-L2
U Input voltage range (L-N or L1-L2)
n
(93 V  U
110 V
(185 V  U
230 V
(321 V  U
400 V
Appendix C – Country notes
U
N

scaling _ factor
( L )
 134 V)
L-N
 266 V)
L-N
 485 V)
L-L
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