Earth measuring clamp BENNING CM E1
Measuring functions:
- earth loop resistance measurement RE in multiply earthed earthing systems
- measurement of leakage and load currents from 0.3 mA to 35 A using the TRUE RMS measuring method
Features:
- precise due to TRUE RMS measuring method (AC, AC+DC)
- optical and acoustic alarm function in case of excessive earthing resistances
- large measuring clamp diameter of 38 mm
- memory of measured values/data logger for 116 measurements
- automatic calibration during start-up
- measuring category CAT III 300 V
- supplied in a hard-top case and with reference resistance loop
Functional principle:
- The measuring clamp has an excitation winding and a sensor winding.
- The excitation winding induces a current flow in the clamped earthing conductor via a constant AC voltage U (f = 3.333 kHz).
- The sensor winding measures the induced current flow.
- The BENNING CM E1 measures (calculates) the resistance of the entire earth loop Rs = U / I.
Advantage of earth resistance measurement without using rods:
- no need to disconnect the earthing conductor (often difficult because of corrosion)
- no need to install probes/auxiliary earth electrodes
- quick and easy measurement
- safe both for the testing personnel and the electrical installation (earthing is maintained during measurement)
- no failures of the electrical installation due to disconnection of the earth connection
Typical fields of application:
- electrical installations with parallel earth connections
- overhead line networks with pole-type earth electrodes
- lightning protection systems of buildings
- street lighting, telecom applications, wind energy
- …
| BENNING CM E1 | |
|---|---|
| indicating range | 9,999 |
| basic accuracy | 1 % |
| AC voltage | - |
| DC voltage | - |
| AC current | 0.3 mA - 35 A |
| DC current | - |
| resistance | RE-loop 0.025 Ω – 1500 Ω |
| continuity / diode | - / - |
| frequency | - |
| capacity | - |
| memory / data log | HOLD, REC (116 measured values) |
| measuring method | TRUE RMS |
| max. clamp opening | 38 mm |
| measuring category | CAT III 300 V |
| item no. | 044684 |
Technical changes, model or color modifications, mistakes and delivery facilities without notice! No responsibility for literal mistakes.
Further information
BENNING CM E1 (german) (647.6 KiB) 
BENNING CM E1 (dutch) (629.2 KiB)
Testing, Measuring and Safety Instruments (2023) (english) (6.0 MiB)
Testing, Measuring and Safety Instruments (2024/2025) (german) (10.8 MiB)
Testing, Measuring and Safety Instruments (2023/2024) (dutch) (5.0 MiB)
Testing, Measuring and Safety Instruments (2023/2024) (french) (8.6 MiB)
Testing, Measuring and Safety Instruments (2021/2022) (greek) (7.7 MiB)
Technical Support
(After Sales Service)
+49 2871 93 555
helpdesk@benning.de
Returns Management, Calibration, Repairs
+49 2871 93 554
returns@benning.de
Product Advice
+49 2871 93 111
duspol@benning.de
Training Management
+49 2871 93 557
trainingcenter@benning.de
The delivery takes place only by wholesaler.
Our agencies (* with warehouse) for the customer topologies Electrical Wholesalers (EGH) and Hardware Wholesalers (PVH):
Herzog Industrievertretung GmbH
Fritz-Karl-Henkel-Str. 12-16
D-67454 Haßloch
ELKA Krischke Elektrotechnik
Wettersteinstr. 12
D-82024 Taufkirchen
SKE Steffen Klewe
Elektrotechnische Handelsvertretung
Teltower Damm 214
D-14167 Berlin
Bremen, Niedersachsen (PVH)
BENNING GmbH & Co. KG
Münsterstr. 135 - 137
D-46397 Bocholt
Lower Saxony (Center/East) (EGH)
TBB-Technischer Bedarf Böttcher GmbH
Gänseweide 7
D-21379 Lüdersburg
Ronny Münch
Jägerstr. 3
D-35099 Burgwald
SKE Steffen Klewe
Elektrotechnische Handelsvertretung
Teltower Damm 214
D-14167 Berlin
BENNING GmbH & Co. KG
Münsterstr. 135 - 137
D-46397 Bocholt
Herzog Industrievertretung GmbH
Fritz-Karl-Henkel-Str. 12-16
D-67454 Haßloch
Udo Wendelmuth
Erfurter Str. 61
D-99195 Schwansee
SKE Steffen Klewe
Elektrotechnische Handelsvertretung
Teltower Damm 214
D-14167 Berlin
Thuringia (EGH/PVH)
Udo Wendelmuth
Erfurter Str. 61
D-99195 Schwansee
(* EGH = for Electrical Wholesaler, PVH = for Hardware Wholesalers)
BENNING GmbH Elektrotechnik und Elektronik
+43/ (0) 2242-32416-0
Eduard-Klinger-Str. 9
3423 St. Andrä-Wördern
Drugmand & Meert / EMAS / Gecom
+32 (0) 22 51 60 60
+32 (0) 22 52 22 66
De bavaylei 110
1800 VILVOORDE
P.J. Timmerman & Fils N.V.
+32 (0) 23 77 71 66
+32 (0) 23 77 94 58
Koning-Albertstraat 3 - 7
1600 SINT-PIETERS LEEUW
Contragent 35
+3 59 42 60 01 45
+3 59 42 60 01 29
Industrialna Str.
6000 STARA ZAGORA
BENNING Power Electronics (Beijing) Co., Ltd.
+86 (0) 10 61 56 85 88
+86 (0) 10 61 50 62 00
Tongzhou Industrial Development Zone
No.1-B BeiEr Street
101113 BEIJING
EST Elektro - System -Technik s.r.o.
+42 02 66 09 07 11
+42 02 66 09 07 17
Pod pekarnami 338/12
190 00 PRAHA 9 VYSOCANY
AGéCOM Diffusion
+33 (0) 3 88 19 70 10
+33 (0) 3 88 19 02 73
6, rue de Londres
CS 60090 Mommenheim
67173 BRUMATH CEDEX
BENNING Conversion d'énergie
+33 (0) 2 32 25 23 94
+33 (0) 2 32 25 08 64
43, avenue Winston Churchill
27404 LOUVIERS
V.KAFKAS S.A.
+30 / 21 63 00 30 00
+30 / 21 63 00 31 00
1 klm Markopoulou Aven.
19002 Paiania Attiki
www.kafkas.gr
BENNING Kft.
+36 (0) 33/ 50 76 00
+36 (0) 33/ 50 76 01
Ringló út 99
1221 BUDAPEST
Amwittools BV
+31 (0) 1 72 53 84 33
+31 (0) 1 72 53 06 55
Harsweg 22
2461 EZ Ter Aar
ITECE Holland B.V.
+31 (0) 1 72 53 84 33
+31 (0) 1 72 53 06 55
Harsweg 22
2461 EZ Ter Aar
EUROTEC LIMITED
+64/ 9/ 5 79 19 90
+64/ 9/ 5 25 33 34
750, Great South Road
1061 PENROSE, AUCKLAND
"LL" Spolka z ograniczona
+48/ 7 13 98 08 00
+48/ 7 13 98 08 02
odpowiedzialnoscia sp. k.
dawniej Lange Lukaszuk Sp. j
ul. Wrocławska 43, Byków
55-095 MIRKOW
BENNING Power Electronics ROM SCS
+40 (0) 2 55 20 60 96
+40 (0) 2 55 51 66 08
Str. Lunca Grofului, Nr. 4
327055 BUCHIN
OOO BENNING Power Electronics Ltd.
+7 4 95/ 9 67 68 50
+7 4 95/ 9 67 68 51
ul. Planetnaya, 11
125167 MOSCOW
Anderba d.o.o.
+381/ 11 76 78 09
+381/ 3 29 21 77
Ljube Stojanovica 36/III
11000 BEOGRAD
BENNING Slovensko s.r.o.
+421 (0) 2 44 45 99 42
+421 (0) 2 44 45 50 05
Kukuricná 17
83103 BRATISLAVA
BENNING c.d.e. SA
+34 91 6 04 81 10
+34 91 6 04 84 02
C/Pico de Santa Catalina 2
Pol. Ind. Los Linares
28970 HUMANES
Hellermann Tyton (Pty) Ltd
+27 11 8 79 66 20
+27 11 8 79 66 03
Private BAG X 158
2128 RIVORIA
OEM Automatic AB
+46/ 75/ 2 42 41 00
+46/ 75/ 2 42 41 19
Fredriksbergsgatan 2
573 92 TRANAS
BENNING Power Electronics GmbH
+41 (0) 44 / 8 05 75 75
+41 (0) 44 / 8 05 75 80
Industriestrasse 6
8305 Dietlikon
RECOM ELECTRONICS AG
+41 (0) 44 / 7 87 10 00
+41 (0) 44 / 7 87 10 05
Samstagernstrasse 45
8832 Wollerau
BENNING Elektrotechnik und Elektronik GmbH & Co. KG
BENNING Power Electronics Beijing Co., Ltd.
