07/ 2018
BENNING ST 710
18
Cross-section
Length
1.0 mm²
1.5 mm²
2.5 mm²
5 m
0.1 Ω
0.06 Ω
0.04 Ω
10 m
0.2 Ω
0.12 Ω
0.08 Ω
25 m
0.5 Ω
0.3 Ω
0.2 Ω
50 m
1.0 Ω
0.6 Ω
0.4 Ω
Table 1:
Resistance values of the protective conductor depending on length and cross-section
- After the R
PE
test has been passed, the measurement of the insulating resistance is carried
out automatically.
- Depending on whether the value is higher or lower than the limiting value, a
or a is
indicated next to the R
ISO
symbol.
- After the R
ISO
test has been passed, the external conductor (L) and the neutral conductor
(N) are checked for line breaks and short-circuits. A passed test regarding line breaks and
short-circuits is indicated by a
next to the
and the "GOOd“ symbol.
- The "PASS" symbol confirms successful testing of the entire testing procedure.
- If the test regarding line breaks, short-circuits or inversion (L/N) has failed, one of the follow-
ing symbols will be displayed instead of the “Good" symbol:
- "OPEN" symbol:
confirms a line break of the external conductor (L) or neutral conductor (N)
- "Shor" symbol:
confirms a short-circuit between the external conductor (L) and the neutral conductor
(N)
- “CrOSS” symbol:
Confirms that the external conductor (L) and the neutral conductor (N) have been in
-
verted.
See figure 5a: Testing of device connecting cables with IEC connector
Note on measuring the protective conductor resistance:
- Alternatively, the measurement of the protective conductor resistance R
PE
can be carried out
as permanent measurement (max. 3 minutes). For this purpose press the key
2
for approx.
> 5 sec. until the
symbol appears on the display. Check the connecting line of the test
object by bending it over the entire length in order to detect weak points or a break of the pro-
tective conductor. The BENNING ST 710 continuously records the current measured value
on the display and stores the maximum value in the memory. By pressing the key
4
again,
the measurement is carried out with reversed polarity. Press the key
4
again to indicate the
maximum value of R
PE
on the display and to continue the testing procedure as described in
section 8.2.3.1.
8.2.3.2 Testing of cable reels, multiple distributors and extension cables
- Connect the IEC power cord (IEC adapter cable) included in the scope of delivery to the IEC
connector
7
of the BENNING ST 710.
- Connect the line to be tested to the test socket
1
and to the shock-proof socket of the IEC
power cord.
- Press the key
4
to start the automatic testing procedure.
- The further testing procedure corresponds to the testing procedure described in section
8.2.3.1.
See figure 5b: Testing of lines, multiple distributors and cable reels
8.3 Voltage measurement on external shock-proof socket
- Connect the IEC power cord (IEC adapter cable) to the IEC connector
7
of the
BENNING ST 710.
- Connect the shock-proof plug to the shock-proof socket to be tested. With the mains voltage
being applied, the voltage measurement will start automatically.
- Depending on the external conductor position (right or left) of the shock-proof socket, the
voltage potentials between the connecting terminals L, N and PE are indicated.
