Bedienungsanleitung Benning ST 725 (Seite 42 von 71) (Deutsch, Englisch, Französisch)

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BENNING ST 725



9.3 Cord test

The cord test can be used both for the testing of IEC power cords (device connecting cables

with IEC coupler) and for the testing of cable reels, multiple distributors and extension cables.

9.3.1 Testing of IEC power cords (IEC adapter cables)

- Disconnect the plug of the mains connection cable from the socket K of the BENNING ST 725.

- Connect the IEC power cord to be tested to the BENNING ST 725 by means of the IEC

connector J.

- Press the -key

to start the automatic testing procedure.

- The test starts with measuring the protective conductor resistance R

- Depending on whether the value is higher or lower than the limiting value, a or a is

indicated next to the R

-symbol.



The protective conductor resistance depends on the length and cross-section

of the line to be tested.

- If R

ishigherthantheadmissiblelimitingvalue(≤0.3Ωuptoalengthof5m)butlower

than 1 Ω, themeasuredvalue will bedisplayedwithout a rating, the“tAble”symbol will

appear on the display and the test procedure will be stopped. The responsible testing staff

determines by means of the limiting value table (see section 7.10 or the table on the rear

of the BENNING ST 725) and by means of the line length of the test object whether the

displayed measured value is acceptable or not.

Press the -key

to give the measured value a positive rating and a will be displayed

next to the R

symbol. The test procedure will be continued.

Press the



-key

to give the measured value a negative rating and a

will be displayed

next to the R

symbol. "FAIL" appears on the display to confirm that the measurement has

been stopped.

- Please refer to Table 1 for typical resistance values of lines.

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

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 and short-circuits has failed, one of the following symbols is

indicated instead of the "Good" symbol:

- "OPEN" symbol:

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