Sonel MPI-540 - Page 34

MPI-540 – USER MANUAL
32
The result can be compared
against the acceptable fault loop
impedance Z
sdop
, determined on
the basis of the security parame-
ters of the tested circuit:
 characteristic,
 rated current.
 Touch the security type field.
Options to select:
 Manufacturer
 GENERAL – no defined
manufacturer
 manufacturers defined in the
meter memory (section 0)
 Type
 GENERAL – no defined type
 types defined in the meter
memory (section 0)
 Time-current characteristic
 Rated current I
N
 Acceptable response time
 Limit – the limit resulting from
standard EN 60364-6
 --– – I
a
as in the standard ta-
bles – no correction
 2/3Z – I
a
is increased by the
value of 0.5I
a
The current is calculated after set-
ting parameters in steps .
I
a
– current ensuring automatic
triggering of a protective device
within a required time.
Description of function icons
Ok – accept security settings
Cancel – cancel the action