--- MPC 20 & 50 TESTER - M-981136 (vers. BD) --- Page
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5.9.- ATTACHING THE TESTING ELECTRODES
- Attach the touch electrodes (25 kg weights) in a suitable place to start
testing:
STEP VOLTAGE
Attach the two touch electrodes 1 metre apart and near to the ground to be
tested. Each electrode are joined by a different cable from the voltmeter.
TOUCH VOLTAGE
Attach the two electrodes together 1 metre from the vertical of the tested
object, both connected by a single cable from the voltmeter. The other
voltmeter cable is connected to the tested object with a crocodile clip.
NUMBER OF TESTS
To ensure that there are no dangerous step or touch voltages, it is
necessary to take many measurements within the test area as well as on
neighbouring land. To do this, it is useful to have a plan of the installation with
distances of 1 metre marked on it.
Whilst testing touch voltage, one must be aware of the possible transmission of
dangerous voltages away from the ground electrode via long metallic structures
(metal fences, pipes, rails etc). Testing must be done further away from these
conductive devices.
5.10.- TESTING VOLTAGES DUE TO STATIC CURRENTS
Prior to starting, press the "ERRATIC VOLTAGES" button (keeping it
pressed down).
If the Vm value remains at 0 V the presence of erratic voltages and
currents will be ruled out. If any value appears, it must be noted to
subsequently compare it with the 20 A and 50 A measurements and to
make the appropriate numerical corrections).
(See section 8 "CORRECTING READ OUTS").
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