MI 3122 Smartec Z Line-Loop / RCD Settings
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4.2.6 Isc factor
Isc factor for calculation of short circuit
current in Z-LINE and Z-LOOP can be
selected in this menu.
Figure 4.7: Selection of Isc factor
Keys:
UP / DOWN
Sets Isc value.
TEST
Confirms Isc value.
Function selectors
Exits back to main function menu.
Short circuit current Isc in the supply system is important for selection or verification of
protective circuit breakers (fuses, over-current breaking devices, RCDs).
The default value of Isc factor (ksc) is 1.00. The value should be set according to local
regulative.
Range for adjustment of the Isc factor is 0.20 3.00.
Notes:
If not defined by other regulations, the recommended value for Isc factor is 0.75
0.80. This value helps to consider the maximum working temperature for the
installation and heating of the wires during a fault.
In UK version, impedance scaling factor Z is used instead of prospective short/fault
scaling factor Isc.
4.2.7 Commander
Selecting this option, the support for remote
commanders can be switched On/ Off in this
menu.
Figure 4.8: Selection of commander
support
Keys:
UP / DOWN
Selects commander option.
TEST
Confirms selected option.
Function selectors
Exits back to main function menu.
Note:
This option is intended to disable the commander’s remote keys. In case of high EM
interfering noise the operation of the commander’s key can be irregular.
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