Electrical Installation Tester
Making Measurements
27
Warning
At this step, be careful not to select L-PE because a high current
loop test will take place. Any RCDs in the system will trip if you
proceed.
Note
Connect the leads in a single-phase test to the system live and
neutral. To measure line-to-line impedance in a 3-phase system,
connect the leads to 2 phases.
7. Press and release . Wait for the test to complete.
• The primary (upper) display shows the line impedance.
• The secondary (lower) display shows the Prospective Short Circuit
Current (PSC).
8. If the mains is too noisy, Err 5 will be displayed. (The measured value
accuracy is degraded by the noise). Press the down arrow to display
the measured value. Press the up arrow to return to the Err 5
display.
Use the connection shown in Figure 15 when measuring in a 3-phase 500 V
system.
L1
L2
L3
L (L1/Red)
N (L3/Blue)
apx025f.eps
Figure 15. Measuring in a 3-Phase System
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