Testing Of Cable Reels, Multiple Distributors And Extension Cables; Testing Of Three-Phase Appliances; Passive Testing; Active Testing - Benning ST 725 Notice D'emploi

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)
See figure 6a: Testing of device connecting cables with IEC connector
Note on measuring the protective conductor resistance:
- Alternatively, the measurement of the protective conductor resistance R
out as permanent measurement (max. 2 x 90 seconds). For this purpose press the key 2
for approx. > 5 seconds until the
line of the test object by bending it over the entire length in order to detect weak points
or a break of the protective conductor. The BENNING ST 725 continuously records the
current measured value on the display and stores the maximum value in the memory. By
pressing the key 2 again, the measurement is carried out with reversed polarity. Press the
key 2 again to indicate the maximum value of R
procedure as described in section 9.3.1.
9.3.2

Testing of cable reels, multiple distributors and extension cables

- Disconnect the plug of the mains connection cable from the socket K of the BENNING ST 725.
- Connect the IEC power cord (IEC adapter cable) included in the scope of delivery to the IEC
connector J of the BENNING ST 725.
- 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 2 to start the automatic testing procedure.
- The further testing procedure corresponds to the testing procedure described in section
9.3.1.
See figure 6b: Testing of lines, multiple distributors and cable reels
Note on testing three-phase lines:
- Disconnect the plug of the mains connection cable from the socket K of the
BENNING ST 725.
- The three-phase line must be connected to the test socket 1 of the BENNING ST 725
by means of the optional passive measuring adapters (044122, 044123 or 044147).
- Plug the 4 mm safety plug of the test cable with alligator clip into the 4 mm safety socket
9 and establish a connection with the PE conductor of the CEE coupling.
- Press the

9.4 Testing of three-phase appliances

9.4.1

Passive testing

For passive testing of three-phase appliances (test object is not running), disconnect the mains
connection cable from the BENNING ST 725. Testing is carried out by means of the passive
measuring adapters (044122, 044123 and 044147) with the external conductors L1, L2 and L3
of the 5-pin CEE coupling being bridged. The protective conductor current / contact current is
measured by means of the alternative leakage current measurement method. Testing is carried
out as described for single-phase appliances in chapter 9.1 and 9.2 (BENNING ST 725 in battery
operating mode, without mains supply).
See figure 7a: Testing of three-phase appliances by means of passive measuring adapters

9.4.2 Active testing

The active testing of three-phase test objects is carried out by means of the optional measuring
adapters 16 A CEE, 5-pin, active (044140) or 32 A CEE, 5-pin, active (044141) under operating
conditions.
- Connect the CEE plug of the test object with the CEE coupling of the measuring adapter and
connect the CEE plug of the measuring adapter to a protected supply mains (3 x 400 V, N,
PE, 50 Hz, 16 A/ 32 A).
- Connect the measuring signal cable of the measuring adapter with the mains connection
socket K of the BENNING ST 725.
- Connect the 4 mm safety plug of the test lead with alligator clip with the 4 mm safety socket
9 of the BENNING ST 725 and establish a connection with a metal part of the test object.
- Make sure that the test sample is protected and switch it on.
- Press the -key 7 to start the automatic testing procedure.
- If a contact voltage is applied to the metal part of the test object, measurement will be
interrupted and the following warning will be shown on the display:
07/ 2018

-key 2 to start the automatic test procedure for measuring R
BENNING ST 725
symbol appears on the display. Check the connecting
on the display and to continue the testing
PE

can be carried
PE
, R and I .
PE ISO EA
34