Stand 04/2013 Operating manual Installation Tester ENNING IT 110 / BENNING IT 120 B B
1 Preface.............................................................................................................................5 2 Safety and operational considerations.........................................................................6 Warnings and notes..........................................................................................................6 Batteries............................................................................................................................
5.3.5 Testing selective (time-delayed) RCDs...................................................................30 5.3.6 Contact voltage.......................................................................................................30 5.3.7 Trip-out time............................................................................................................32 5.3.8 Trip-out current.......................................................................................................33 5.3.
10 Appendix A Fuse base tables......................................................................................64 10.1 Fuse base tables.............................................................................................................65 11 Appendix B IT Systems.........................................................................................................69 11.1 Applicable standards.....................................................................................................
1 Preface Congratulations on your purchase of this BENNING instrument and its accessories. The development of this instrument was based on long and rich experience. BENNING IT 110/ BENNING 120 B is a professional, multifunctional, hand-held test instrument intended for all measurements performed for total inspection of electrical installations in buildings.
2 Safety and operational considerations 2.1 Warnings and notes In order to reach high level of operator’s safety while carrying out various tests and measurements using the BENNING instrument, as well as to keep the test equipment undamaged, it is necessary to consider the following general warnings: - The symbol at the BENNING IT 110/ BENNING IT 120 B means: “Read the Instruction manual with special care to safety operation”.
Remarks concerning the measuring functions General - The symbol means that the selected measurement cannot be carried out due to irregular conditions at the input terminal. Carry out measurements of insulating resistance, resistance/ continuity test and earth resistance at discharged objects only! The PASS/ FAIL indication is activated when a limiting value has been defined. Choose a limiting value which is appropriate for evaluating the measuring results.
Line impedance - The low limit prospective short-circuit current value depends on fuse type, fuse current rating, fuse trip-out time and IPSC-scaling factor. The specified accuracy of tested parameters is valid only if the mains voltage is stable during the measurement. Resistance to earth (BENNING IT 120 B only) - If the voltage between the test terminals H and E is higher than 30 V the earth measurement will not be performed. If a noise voltage higher than approx.
2.3 Charging The battery is charged whenever the power supply adapter is connected to the BENNING IT 110/ BENNING IT 120 B. In-built protection circuits control the charging procedure and assure maximal battery lifetime. Power supply socket polarity is shown in figure 2.1. - + Abb. 2.1: Power supply socket polarity Note: - Use only the power supply adapter delivered by the manufacturer or distributor of the BENNING IT 110/ BENNING IT 120 B to avoid possible fire or electric shock. 2.
2.
3 Instrument description 3.1 Front panel 3 4 2 5 7 6 1 Fig. 3.1: Front panel, example: BENNING IT 120 B Legend: 1 ON/OFF key, to switch on or off the BENNING IT 110/ BENNING IT 120 B The BENNING IT 110/ BENNING IT 120 B is automatically switched off 10 minutes after the last key was pressed or the function selector switch rotated. 2 Function selector switch. 3 BENNING IT 110: CAL key, to compensate test lead resistance in lowΩ resistance measurement.
3.2 Connector panel 2 1 > 550V 4 3 5 6 Fig. 3.2: Connector panel Legend: 1 Test connector Warning: Maximal allowed voltage between test terminals and earth is 600 V. Maximal allowed voltage between test terminals is 550 V.
Fig. 3.4: Battery and fuse compartment Legend: 1 Fuse F1 2 Fuse F1 3 Fuse F1 4 Serial number label, a further serial number label is located outside next to the information label 5 Battery cells (size AA) 6 Battery holder 3.4 Bottom view Legend: 1 Information label 2 Neck belt openings 3 Screw 4 Serial number label with barcode Fig. 3.
3.5 Carrying the BENNING IT 110/ BENNING IT 120 B With the neck carrying belt supplied as standard, various possible ways of carrying the BENNING IT 110/ BENNING IT 120 B are available. The BENNING IT 110/ BENNING IT 120 B is hung around operator‘s neck only - quick placing and displacing. The BENNING IT 110/ BENNING IT 120 B can be used even placed in a soft carrying bag - the test cable is connected to the instrument through the front aperture. 3.
3.6.2 Optional accessories BENNING IT 110 BENNING IT 120 B Optional accessories Current clamp adapter CC 2 (item no. TN 044110) LUXmeter probe, type B (item no. TN 044111) Earthing set consisting of 2 earth rods and 3 test leads (item no.
4 Operation of the BENNING IT 110/ BENNING IT 120 B 4.1 Meaning of symbols and messages on the display of the BENNING IT 110/ BENNING IT 120 B The display is divided into four sections: 1 4 2 3 Fig. 4.1: Display outlook Legend: 1 Function and parameter line In the top display line the measuring function/sub-function and parameters are displayed. 2 Message field In this field battery status and warnings/messages related to the actual measurement are displayed.
Low battery indication. Battery pack is too weak to guarantee correct result. Replace the batteries. Charging is running (if power supply adapter is connected). 4.1.3 Message field – measurement warnings/messages Warning! High voltage is applied to the test terminals. Warning! Phase voltage on the PE terminal! Stop all the measurements immediately and eliminate the fault before proceeding with any activity. Measurement is running. Consider any displayed warnings.
Resistance of auxiliary earth electrode and probe too high. 4.1.4 Result field Measurement passed. Measurement failed. Measurement is aborted. Check the conditions at the input terminal. 4.1.5 Other messages Instrument settings and measurement parameters/limits are set to initial (factory) values. For more information refer to chapter 4.5.4 Recalling original settings. Probe LUXmeter probe is turned off or disconnected from the instrument.
4.1.7 Function and parameter line Fig. 4.2: Function selector switch and respective parameter line, example: BENNING IT 120 B Legend: 1 Main function name 2 Function or sub-function name 3 Measuring parameters and limit values 4.1.
Fig. 4.3: Example of help menu 4.4 Setup menu In the Setup menu the following actions can be taken: - Supply system selection - Prospective short/fault current scaling factor adjustment - Language selection - Communication port settings - Activating/ deactivating the COMMANDER (switchable probe tip) To enter the Setup menu press the backlight key direction at the same time.
to enter the Prospective short/fault current scaling factor adjustment menu. Fig. 4.6: Scaling factor adjustment menu Use the and keys to adjust the scaling factor. Press the TEST key to accept the new setting. More information about the prospective short/fault current scaling factor can be found in chapters 5.3 and 5.4. 4.4.3 Language selection Select SET LANGUAGE in the Setup menu by using the to enter the Language selecting menu. and keys and press the TEST key Fig. 4.
Note: - It is useful to deactivate the COMMANDER, if strong sources of interference might affect the functioning of the COMMANDER. 4.4.6 Recalling original settings The following parameters and settings can be set to initial (factory) values: - Test parameters and limit values - Contrast - Prospective short/fault current scaling factor - Supply system - Communication port (BENNING IT 120 B only) In order to recall the original setting press and hold the reset” message will be displayed for a while.
4.5 Display contrast adjustments When low-level backlight is activated press and hold BACKLIGHT key until the Display contrast adjustment menu is displayed. Fig. 4.9: Contrast adjustment menu Use the and keys to adjust the contrast level. Press the TEST key to accept the new setting.
5 Measurements 5.1 Insulation resistance (RISO) Insulation resistance measurement is performed in order to assure safety against electric shock.
Fig. 5.3: Example of insulation resistance measurement results Displayed results: R: Insulation resistance Um: Test voltage of the BENNING IT 110/ BENNING IT 120 B Save displayed results for documentation purposes. Refer to chapter 6.1 for further information on setting functions and saving of measurement results.
Connect the test cable to the BENNING IT 110/ BENNING IT 120 B. Step 2 Set the following limit value: - High limit resistance value Step 3 Before performing the lowΩ measurement, compensate test lead resistance as follows: 1. Short test lead first as shown in figure 5.5. Fig. 5.5: Shorted test leads 2. P ress the TEST key in order to perform regular measurement. Result close to 0.00 Ω is displayed. 3. Press the CAL key.
Fig. 5.7: Connection of tip commander and optional probe test lead (extension) Step 5 Check the displayed warnings and online voltage/terminal monitor before starting measurement. If OK, press the TEST key. After performing, the measurement results appear on the display together with the PASS/FAIL indication (if applicable). Fig. 5.
Connect test cable to the item under test. Follow the connection diagram shown in figures 5.10 and 5.11 to perform Continuity measurement. Use the Help function if necessary. T L/L1 PE/L3 N/L2 x Step 3 z Set the following limit value: - High limit resistance value S Step 2 y Connect the test cable to the BENNING IT 110/ BENNING IT 120 B. R y z x R S T Fig. 5.10: Connection of universal test cable Fig. 5.
Note: - If voltage between test terminals is higher than 10 V the continuity measurement cannot be performed. - Before performing continuity measurement compensate test lead resistance if necessary. The compensation is performed in LowΩ function. 5.
positivestarting Startpolaritat positive polarity (0°) (0°) negativestarting Startpolaritat negative polarity (180°) (180°) Fig. 5.13: Test current started with the positive or negative half-wave For RCDs of type B, the fault current can be started with positive or negative During automatic testing (AUTO), the polarity is reversed automatically. polarity. 5.3.5 Testing selective (time-delayed) RCDs Selective RCDs demonstrate delayed response characteristics.
Fig. 5.14: Contact voltage measurement menu Connect the test cable to the BENNING IT 110/ BENNING IT 120 B. Step 2 Set the following measuring parameters and limit values: - Nominal residual current RCD type Limit contact voltaget Step 3 Follow the connection diagram shown in figure 5.15 to perform contact voltage measurement. Use the Help function if necessary L1 L2 L3 N PE N/L2 PE/L3 L /L N Ro 1 PE L RE Fig. 5.
5.3.7 Trip-out time (RCDt) Trip-out time measurement is used to verify the effectiveness of the RCD. This is achieved by a test simulating an appropriate fault condition. Trip-out times vary between standards and are listed below.
Step 3 Follow the connection diagram shown in figure 5.15 (see the chapter Contact voltage) to perform trip-out time measurement. Step 4 Check the displayed warnings and online voltage/terminal monitor before starting the measurement. If OK, press the TEST key. After performing, the measurement results with PASS/FAIL indication appear on the display. Fig. 5.
Step 2 By using cursor keys the following parameters can be set in this measurement: - Nominal residual current - RCD type - Test current starting polarity Step 3 Follow the connection diagram shown in figure 5.15 (see the chapter Contact voltage) to perform trip-out current measurement. Use the Help function if necessary. Step 4 Check the displayed warnings and online voltage/terminal monitor before starting the measurement. If OK, press the TEST key.
Connect the test cable to the BENNING IT 110/ BENNING IT 120 B. Step 2 Set the following measuring parameters: - Nominal differential trip-out current - RCD type Step 3 Follow the connection diagram shown in figure 5.15 (see the chapter Contact voltage) to perform the RCD autotest. Use the Help function if necessary. Step 4 Check the displayed warnings and online voltage/terminal monitor before starting the measurement. If OK, press the TEST key.
After re-switching the RCD the autotest sequence automatically proceeds with step 4. 4. Trip-out time measurement with the following measurement parameters: - Test current I∆N - Test current started with the negative half-wave at 180° Measurement normally trips an RCD within allowed time period. The following menu is displayed: Fig. 5.25: Step 4 RCD autotest results After re-switching the RCD the autotest sequence automatically proceeds with step 5. 5.
Save displayed results for documentation purposes. Refer to chapter 6.1 for further information on setting functions and saving of measurement results (BENNING IT 120 only). Note: - The measurement of contact voltage in pre-test does not normally trip an RCD. However, the trip limit may be exceeded as a result of leakage current flowing to the PE protective conductor or via a capacitive connection between L and PE conductors.
Connect the test cable to the BENNING IT 110/ BENNING IT 120 B. Step 2 Set the following measuring parameters: - Fuse type - Fuse current rating - Fuse trip-out time Appendix A contains a list of different fuse types. Step 3 Follow the connection diagram shown in figure 5.29 to perform loop impedance measurement. Use the Help function if necessary. L1 L2 L3 N PE N/L2 L /L PE/L3 N Ro 1 PE L RE Fig. 5.
- Loop impedance (Zs) measurement trips an RCD. 5.4.2 Loop impedance (Zsrcd) Zsrcd sub-function performs measurements in supply systems equipped with an RCD. The measurement current is small enough to prevent the RCD from tripping. Modern measurement methods allow for stable and reliable results despite low measured signals.
Displayed results: Z Loop impedance ISC Prospective short-circuit current Lim Low limit of prospective short-circuit current value Save displayed results for documentation purposes. Refer to chapter 6.1 for further information on setting functions and saving of measurement results (BENNING IT 120 B only). Note: - Measurement of the loop impedance (Zsrcd) does not normally trip an RCD.
Appendix A contains a list of different fuse types. Step 3 Follow the connection diagram shown in figure 5.34 to perform phase-neutral or phasephase line impedance measurement. Use the Help function if necessary. PE/L3 N Ro 1 PE N/L2 L /L PE/L3 N/L2 L/L1 L1 L2 L3 N PE L RE Fig. 5.34: Phase-neutral or phase-phase line resistance measurement Step 4 Check the displayed warnings and online voltage/terminal monitor before starting the measurement. If OK, press the TEST key.
Fig. 5.36: Phase sequence test menu L/L1 L/L1 L3 L2 L1 N PE N/L2 Follow the connection diagram shown in figure 5.37 to test phase sequence. PE/L3 Step 2 N/L2 Connect the test cable to the BENNING IT 110/ BENNING IT 120 B PE/L3 option result1.2.3 result2.1.3 Fig. 5.37: Connection of universal test cable and optional three phase cable Step 3 Check the displayed warnings and online voltage/terminal monitor. Continuous test is running. The actual result is shown on the display during the test.
Fig. 5.39: Voltage and frequency measurement menu Connect the test cable to the BENNING IT 110/ BENNING IT 120 B. Step 2 Follow the connection diagram shown in figure 5.40 to perform voltage and frequency measurement. PE/L3 N Ro 1 PE N/L2 L /L PE/L3 N/L2 L/L1 L1 L2 L3 N PE L RE Fig. 5.40: Connection diagram Step 3 Check the displayed warnings and online voltage/terminal monitor. Continuous test is running. Actual results are shown on the display during measurement. Fig. 5.
How to test the PE terminal: Step 1 Connect the test cable to the BENNING IT 110/ BENNING IT 120 B. Step 2 Follow the connection diagrams in figures 5.42 and 5.43 to test the PE terminal. L1 N PE reversed phase and protection conductors most dangerous situation Fig. 5.42: Connection of plug cable and mains outlet with reversed L and PE conductors L1 N PE reversed phase and protection conductors most dangerous situation PE/L3 N/L2 L/ L1 N PE L Fig. 5.
5.9 Resistance to earth (RE) (BENNING IT 120 B only) The BENNING IT 120 B allows resistance to earth measurement using 3-wire measuring method (earthing set). Consider the following instructions when performing resistance to earth measurement: - The probe (S) is positioned between the earth electrode (E) and auxiliary earth electrode (H) in the earth reference plane (see figure 5.45).
Displayed results: R: Resistance to earth RC: Auxiliary earth electrode resistance RP: Probe resistance Save displayed results for documentation purposes. Refer to chapter 6.1 for further information on setting functions and saving of measurement results. Note: - If the voltage between the test terminals H and E is higher than 30 V the earth measurement will not be performed.
L1 L2 L3 N PE BENNING CC 2 IL I c c Fig. 5.48: Current clamp connection Step 3 Check the displayed warnings and online voltage/terminal monitor before starting the measurement. If OK, press the TEST key to start the measurement. The measuring result is shown on the display during measurement. To stop measurement at any time press the TEST key again. The last measured result is displayed. Fig. 5.
Fig. 5.50: Illumination measurement menu Connect the luxmeter probe to the instrument. Step 2 Set the following limit value: - Low limit illumination value Step 3 Turn on the luxmeter probe (ON/OFF key, green LED is lit). Position the luxmeter probe in such a way that the measured light falls in parallel onto the light sensor. Follow the connection diagram shown in figure 5.51 to perform illumination measurement. Use the Help function if necessary. Fig. 5.
6 Working with measurement results (BENNING IT 120 B only) After the measurement is completed, all displayed measurement results and parameters can be stored. It is possible to classify, save and recall the measured values directly at the place of measurement; they can also be transmitted to the PC for further processing and recording.
By using the Use the / / keys set the cursor to the BLOCK line (max. 999). keys to enter the desired element BLOCK xx. By using the Use the / / keys set the cursor to the FUSE line (max. 999). keys to enter the desired element FUSE xx. In No. line the number of saved results is displayed. Step 3 Press the MEM key to save the results. “Saved to memory” message is displayed for a while. After saving the results the instrument returns to measurement menu.
Fig. 6.5: Recall results menu Use the / keys to select the function for which you want to view results. Press the TEST key to confirm. Fig. 6.6: Examples of recall results menu By using the / keys other saved results can be viewed under the same object, block and fuse items. Press or to return to RECALL RESULTS menu. Note: No measurement results can be recalled if the switch is set to „V~“. Exit the memory recall: Use the „MEM“ key (several times) or the selector switch. 6.
Step 3 Set cursor to the No. line by using the / keys set. Fig. 6.8: Delete results menu Use the / keys to select the function for which you want to view results. The selected measurement result is shown when the TEST key is pressed, and it is deleted when the TEST key is pressed again. Deletion can be aborted - without deleting the selected results - by pressing the MEM key once or several times.
Continue with instructions under Step 3. Deleting measurement results from the 1rd structure level (OBJECT) By using the / keys set cursor to OBJECT line. Use the desired element OBJECT xxx / keys to enter the In No. line the number of saved results in the 1st structure level is displayed. Fig. 6.12: Deleting results from the 1st level Step 3 Use the / keys to select the function for which you want to view results.
7 RS232 and USB communication (BENNING IT 120 B only) The instrument includes both RS232 and USB communication ports. Stored results can be sent to PC for additional activities. 7.1 BENNING PC-Win IT 120 B Software The BENNING PC-Win IT 120 B Software allows: - to document measurement results to create simple measuring protocols to export measurement results to „Spreadsheet“ programmes. How to download saved results to PC Step 1 Connect the BENNING IT 120 B to the PC using the USB or RS232 cable.
Fig. 7.2: Example of downloaded results Step 4 Edit downloaded structure for documentation purposes.
8 Maintenance 8.1 Replacing fuses There are three fuses under the back cover of the BENNING IT 110/ BENNING IT 120 B. - F1 M 0.315 A / 250 V, 20×5 mm, T.Nr.: 757211 This fuse protects internal circuitry of lowΩ resistance function if test probes are connected to the mains supply voltage by mistake.. - F2, F3 F 4 A / 500 V, 32×6.3 mm, T.Nr.: 757212 General input protection fuses of test terminals L/L1 and N/L2.
9 Technical specifications 9.1 Insulation resistance Insulation resistance (nominal voltages 100 VDC and 250 VDC) Measuring range according to EN61557-2: 0.017 MΩ to 199.9 MΩ Measuring range (MΩ) Resolution (MΩ) 0.000 (0.017) - 1.999 0.001 2.00 - 99.99 0.01 100.0 - 199.9 0.1 Accuracy ± (5 % of reading + 3 digits) Insulation resistance (nominal voltages 500 VDC and 1000 VDC) Measuring range according to EN61557-2: 0.015 MΩ to 999 MΩ Measuring range (MΩ) Resolution (MΩ) 0.000 (0.015) - 1.
The number of possible tests with a new set of batteries Automatic polarity reversal of the test voltage bis zu 5500 9.2.2 Continuity Measuring range (mA) Resolution (mA) 0.0 - 99.9 0.1 100 - 1999 1 Accuracy ± (5 % of reading + 3 digits) Open-circuit voltage 6.5 VDC - 9 VDC Short-circuit current max. 8.5 mA Test lead compensation up to 5 Ω 9.3 RCD 9.3.
Test current max. 0.5×I∆N Limit contact voltage 25 V, 50 V U Fault loop resistance at contact voltage is calculated as: R L = C . I∆N RL: 0.00 Ω - 10.00 KΩ 9.3.
Trip-out time Measuring range (ms) Resolution (ms) Accuracy 0 - 300 (AC, A, F type) 1 ± 3 ms 0 - 140 (B, B+ type) 1 ± 3 ms Contact voltage Measuring range according to EN61557: 1.0 bis 99.9 V Measuring range (V) Resolution (V) Accuracy 0.0 (3.0) - 9.9 0.1 (-0% / +10 %) of reading +2 digits 10.0 - 99.9 0.1 (-0% / +10 %) of reading 9.4 Loop impedance and prospective short-circuit current Function Loop impedance (loop resistance) Measuring range according to EN61557-3: 0.
9.5 Line impedance and prospective short-circuit current Measuring range according to EN61557-3: 0.26 Ω up to 1999 Ω Measuring range (Ω) Resolution (Ω) 0.00 (0.25) - 19.99 0.01 20.0 - 99.9 0.1 100 - 1999 1 Accuracy ±(5% of reading + 5 digits) Prospective short-circuit current Measuring range (A) Resolution (A) 0.00 ÷ 19.99 0.01 20.0 ÷ 99.9 0.1 100 ÷ 999 1 1.00 kA ÷ 9.99 kA 10 10.0 ÷ 24.4 kA Test current (at 230 V) Nominal voltage range 9.
9.9 Resistance to earth (BENNING IT 120 B only) Measuring range according to EN61557-5: 0.04 Ω up to 1999 Ω Measuring range (Ω) Resolution (Ω) 0.00 (0.02) ÷ 19.99 0.01 20.0 ÷ 99.9 0.
9.12 General data Power supply voltage 9 VDC (6×1.5 V battery cells, size AA) Power supply adapter 12 V - 15 V / 400mA Operation typical 15 h Plug commander (optional) Overvoltage category CAT III / 300 V Overvoltage category CAT III / 600 V, CAT IV / 300 V Protection classification double insulation Pollution degree 2 Protection degree IP 42 Display 128x64 dots matrix display with backlight Memory size 500 measurement results Dimensions (w x h x d) 23 cm x 10.
10 Appendix A Fuse base tables Low-voltage fuses (fuse-links) acc. to DIN EN 60269. VDE 0636 (e.g. l.v. h.b.c.) and circuit-breakers acc. to DIN EN 60898. VDE 0641 Melting times or trip-out time are depending on current-time characteristics and trip-out current Fuse links are classified in utilisation categories (e.g.
10.
Fuse, utilisation class / type Fuse, total clearing time gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-gG (NV, gG) gL-
Fuse, utilisation class / type C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C Fuse, total clearing time 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.4 s 0.4 s 0.4 s 0.4 s 0.4 s 0.4 s 0.4 s 0.
Fuse, utilisation class / type K K K K K K K K K K K K K K K K K K K K K K D D D D D D D D D D D D D D D D D D D D D D D D D D Fuse, total clearing time 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.2 s 0.4 s 0.4 s 0.4 s 0.4 s 0.4 s 0.4 s 0.4 s 0.4 s 0.4 s 0.4 s 0.4 s 0.4 s 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 35 ms 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.1 s 0.2 s 0.2 s Fuse, rated current 1.6 A 2A 4A 6A 10 A 13 A 16 A 20 A 25 A 32 A 0.
11 Appendix B IT Systems 11.1 Applicable standards EN 60364-4-41, EN 60364-6, EN 60364-7-710, BS 7671 11.2 Basic information The IT system is an power supply network which is isolated from the protective conductor. It is an ungrounded power supply network. Either the network is not connected to earth directly or it is connected to earth via a relatively high impedance. It is mainly used in areas requiring addition protection against electrical accidents.
L1 133 V 133 V 230 V 133 V 230 V L2 230 V L3 Optional high impedance N (Optional) IMD Figure 11.1: General IT System - three-phase star connection, optionally delta connection optional neutral conductor single-phase connection is possible as well different mains voltages (not only three phases 230 V as shown above) The faulty connection of an arbitrary conductor to the protective conductor is considered to be the first fault and is admissible.
IT system function Continuity test R low-Ω continuity test Insulation Line impedance line impedance prospective short-circuit current Fault loop impedance fault loop impedance prospective fault current Voltage, frequency Phase shift FI / RCD functions contact voltage Uc tripping time tripping current automatic testing Resistance to earth PE conductor test key (TEST key) Remarks independent of the selected power supply network independent of the selected power supply network impedance ZL1-L2.
Zi RCD RCD L1 L2 L3 PE L/L 1 N/L2 L2 PE/L3 PE L1 RE2 RE IT 120 B SPEICHERN MEM HILFE HELP KAL CAL IT 120 B EIN/AUS ON/OFF Figure 11.3: FI/RCD test in an IT system 11.3.4 First fault leakage current (ISFL) The ISFL measurement is carried out in order to measure the maximum current which could flow from the tested line into the protective conductor.
L1 L2 L3 PE IMD N/L2 PE/L3 L/L 1 L2 Zi PE L1 RE IT 120 B SPEICHERN MEM HILFE HELP KAL CAL IT 120 B EIN/AUS ON/OFF Figure 11.5: Connection of test commander and universal test cable Step 4 Before measuring, please observe the warnings displayed and the online voltage/ terminal monitor. If you do not observe any problems, press the TEST key. After the measurement, the measuring results are displayed together with a PASS/ FAIL information (if applicable). Figure 11.
12 Appendix C Power Supply Network with Lower Voltage 12.1 Applicable standards BS7671 12.2 Basic information If an integrated protection against electrical accidents is required, but no safety extra-low voltage is used, it is necessary to use specific power supply networks. For this purpose, it is possible to use power supply networks with lower voltage and earthing.
Fault loop resistance fault loop resistance prospective fault current Voltage, frequency Phase shift FI/RCD functions contact voltage Uc tripping time tripping current automatic testing Resistance to earth PE conductor test key (TEST key) both fault loops, R1 (L1-PE) and R2 (L2-PE) ISC1 and ISC2 for both fault loops symbols adapted to a power supply network with lower voltage automatic recognition of three-phase mains for both options, U1 (L1-PE) and U2 (L2-PE) maximum nominal differential current is limit
12.3.4 Loop resistance and prospective fault current The definition of the nominal voltage for calculating IPFC is modified as follows: - 55 V for selection of a single-phase center-tapped network, 63 V for selection of a three-phase network. The test can be carried out for both combinations (L1-PE and L2-PE). For each individual test result, the corresponding indication is shown.
Contact voltage limiting value 25 V or 50 V The contact voltage is calculated relating to I∆N (standard) or 2 × I∆N (selective). For the contact voltage, the fault loop resistance is calculated as follows: RL = UC I ∆N Tripping time The entire measuring range complies with the requirements specified in EN61557-6. The specified accuracies apply to the entire operating range.
Contact voltage Measuring range (V) 0.0 ÷ 9.9 10.0 ÷ 99.9 Resolution (V) 0.1 0.1 Accuracy (-0 %/ +15 % of reading + 2 digits) (-0 %/ +15 % of reading) 12.4.2 Loop resistance and prospective fault current Rs sub-function In compliance with EN61557-3, the measuring range is between 0.32 Ω ÷ 1999 Ω. Measuring range (Ω) Resolution (Ω) Accuracy 0.00 ÷ 19.99 0.01 ±(5 % of reading + 5 digits) 20.0 ÷ 99.9 0.1 100 ÷ 1999 1 *) The accuracy shall apply provided that the mains voltage is stable during measurement.
Nominal input voltage Test options No tripping of the FI/RCD 55 V / 63 V (45 Hz ÷ 65 Hz) L1-PE and L2-PE 12.4.3 Line resistance and prospective short-circuit current Line resistance In compliance with EN61557-3, the measuring range is between 0.25 Ω ÷ 1999 Ω. Measuring range (Ω) Resolution (Ω) Accuracy 0.00 ÷ 19.99 0.01 20.0 ÷ 99.9 0.1 ±(5 % of reading + 5 digits) 100 ÷ 1999 1 *) The accuracy can be affected by strong noise of the mains voltage.
Distributor: Manufacturer: Benning Elektrotechnik & Elektronik GmbH & Co. KG Münsterstraße 135 - 137 D - 46397 Bocholt Phone: +49 (0) 2871 - 93 - 0 • Fax: +49 (0) 2871 - 93 - 429 www.benning.de • E-Mail: duspol@benning.de No part of this publication may be reproduced or utilized in any form or by any means without permission in writing from BENNING. © 2009 BENNING IDNR: 20 751 078 T.Nr.: 798257.
