10.2 Protective conductor resistance
The limit value is:
0.3
Ω
for devices with
connecting cables up to 5 m,
plus 0.1
Ω
for every additional 7.5 m, up to a maximum of
1.0
Ω
(see also table on Page 24).
The [next] button takes you to the first electrical test: the protective
conductor resistance (Fig. 27).
The measured value is displayed in large text in the middle of the screen.
The star sign on the left side of the display blinks when the
measuring process is running (the values are being measured).
The [OK] button appears when the measured value is determined.
The corresponding limit value „Lv“ and the momentary test current (+) are
also displayed.
You can display the help screen by pressing the [help] button. A measuring
principle circuit corresponding to the figure in this operating manual and a
short help text are displayed. After pressing the [End] button you return to
the measuring display.
In the next stage the polarity of the test current (–) is reversed and the
protective conductor resistance is measured again.
During the measurement, the connecting cable of the test object
should be moved, section by section, along its whole length, in
order to find broken conductors or weak points.
10.3 Insulation resistance
(compare with point 10.41)
The limit value is:
1.0 M
Ω
(PC I)
2.0 M
Ω
for touchable conductive parts that are not connected to
the protective conductor (PC I)
0.3 M
Ω
for PC I devices with switched on heating elements
≥
3.5 kW *)
*) If the required insulation resistance is not achieved in the case of devices in protection class
I with heating elements with a total capacity of 3.5 kW, the device is nevertheless rated as
faultless if the protective conductor current does not exceed the limit values (tester setting –
PC: Ie).
If you have selected a test procedure
with insulation resistance
in the
„Settings for measuring“ screen, the measuring display for the insulation
resistance measurement (Fig. 29) appears after you press the [OK] button.
The magnitude of the test voltage is displayed as well as the measured
value (minimum of 500 V DC).
The star sign on the left side of the display blinks when the
measuring process is running (the values are being measured).
The [OK] button appears when the measured value is determined.
A help display with a measuring principle circuit and a help text is also
available here.
Fig. 28
Fig. 29
26
Operating manual for the TG uni 1, TG euro 1 and TG euro 1 med appliance tester
Conducting tests in accordance with DIN VDE 0701-0702, Example 1 – Devices with a protective conductor (PC I)
f
f
Fig. 27
test current reversed
