Benning IT 120 B 044102 Manual De Usuario

41

Appendix A contains a list of different fuse types.

 Follow the connection diagram shown in figure 5.34 to perform phase-neutral or phase-

phase line impedance measurement. Use the Help function if necessary.

L1

L2

L3

N

PE

R

E

Ro

L

PE

N

L/L1

N/L2

PE/L3

N

/L

2

L

/L

1

P

E

/L

3

Step 4 

Check the displayed warnings and online voltage/terminal monitor before starting the 
measurement. If OK, press the TEST key. After performing, the measurement results 
appear on the display together with the PASS/FAIL indication (if applicable).

Displayed results:
Z   

Line impedance

Prospective short-circuit current

Lim 

Low limit of prospective short-circuit current value

Save displayed results for documentation purposes. Refer to chapter 6.1 for further information on 
setting functions and saving of measurement results (BENNING IT 120 B only).

Note:
-   The low limit prospective short-circuit current value depends on fuse type, fuse current rating, 

fuse trip-out time and I

PSC

-scaling factor. 

-   The specified accuracy of tested parameters is valid only if the mains voltage is stable during

the measurement.

When connecting three-phase loads (motors and other electro-mechanical machines) to three-
phase mains installations, the correct phase rotation has to be ensured. To this end, check the 
phase rotation direction (phase sequence) before the connection is made. 

How to test phase sequence:
Step 1 

Select   function (phase rotation) with the function selector switch. The following menu 
is displayed: