Isc Factor; Commander - METREL MI 3122 Instruction Manual

MI 3122 Smartec Z Line-Loop / RCD

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.
Keys:
UP / DOWN
TEST
Function selectors
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.
Keys:
UP / DOWN
TEST
Function selectors
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.
Sets Isc value.
Confirms Isc value.
Exits back to main function menu.
Selects commander option.
Confirms selected option.
Exits back to main function menu.
Figure 4.7: Selection of Isc factor
Figure 4.8: Selection of commander
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Settings
support