14.5 Loop test recommendation table
During the selection of a loop test combination the guidance table may appear. This table indicates the combination
of tests selected that have been selected may not be possible or there may be a better option available.
Fig 49: Loop test guidance table
The table shows the combinations of tests we recommend for loop testing. For example:
If you select RCD type A/AC (because there is an RCD in the circuit you are testing, plus you select Live – Neutral
(L-N) then the table will warn you the combination is not possible. This is because there is no reason to use an RCD
compatible loop test mode when testing Live to Neutral, as shown below:
Fig 50: Loop test guidance table 2
Change your selection to one of those marked in green or as a second best option, yellow.
14.6 Measuring Loop Impedance – No RCD in circuit
1. Turn the left-hand rotary knob to the Loop Impedance
test position.
The display illuminates with a green background.
2. Plug your L (red) test-lead into the red socket and your
PE (green) test-lead into the green socket.
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Earth Loop Impedance testing – TrueLoop™
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