Megger LCB2000/2 Guide De L'utilisateur page 13

Operation - General
Determining Phase Sequence
When connected to all conductors of a three phase
system, the instrument automatically displays the
sequence of phase rotation.
Connect the the Installation Testers as follows:-
Line 1 Red phase
Line 2 Yellow phase
Line 3 Blue phase
If connected as above, the
when the sequence is 1:2:3, or Red-Yellow-Blue.
The symbol is displayed when the sequence is
1:3:2, or Red-Blue-Yellow. If one of the lines is faulty,
neither of the symbols is displayed and the normal
'neon' polarity indication is shown.
In the Loop L-N switch position the voltage between
the red and black leads is displayed. In other switch
positions the voltage between the red and green leads
is measured and displayed.
12
Red lead
Green lead
Black lead
symbol is displayed
Operation - Loop Testing
Loop Impedance measurement
Loop impedance measurement of 0,01Ω up to 3,00kΩ
can be made via installation sockets using the plug
terminated test lead, or at any other convenient point
on the installation using the two wire lead set. If Setting
A (see page 5) is selected when using the plug
terminated lead set, the polarity of the mains socket is
immaterial. Line and Neutral will be swapped if
necessary, and an indication given on the display.
Setting b requires Line and Neutral to be fixed.
Test results may be adversely affected by
supply voltage fluctuations or electrical
noise during measurement. It is
recommended that tests are repeated and
the results verified, if measurment results
are considered abnormal.
The Installation Testers will measure the loop resistance
from the supply end of the standard test leads, allowing
for their resistance.