—
20
—
#
WARNING
Do not connect phase to phase as this instrument is rated at 230V.
7.5
Loop impedance at 3 phase equipment
Use the same procedure as in 7.4 above ensuring that only one phase is
connected at a time i.e.:
First Test: red lead to phase 1, black lead to neutral, green lead to earth.
Second Test: red lead to phase 2, black lead to neutral, green lead to earth etc.
#
WARNING
NEVER CONNECT THE INSTRUMENT TO TWO PHASES AT THE
SAME TIME.
Testing as described in 7.4 and 7.5 above will measure the Phase-Earth loop
impedance. If you wish to measure the Phase-Neutral loop impedance then the
same procedure should be followed except the earth lead should be connected
to the neutral of the system i.e.: the same point as the black neutral lead.
If the system has no neutral then you must connect the black neutral lead to the
earth i.e.: the same point as the green earth lead. This will only work if there is
no RCD in this type of system.
Note: Before commencing the test, please clearly eliminate the load which
remains in the circuit to be tested, otherwise it may affect the accuracy of
the measurement.
Fig 11
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