The BD7 Digital Loop Tester accurately and reliably measures loop resistances
The BD7 Digital Loop Tester accurately and reliably measures loop resistances and prospective fault currents at socket outlets, distribution boards and light sockets at any point of access in an electrical circuit. The BD7 also tests ground bonding. The instrument measures the maximum impedance of a potential fault path on a live system, including the phase conductor and the return path back through ground to the supply transformer using the system’s own current by simulating a fault across a known resistance. Due to the test’s brevity (16mS), protective devices do not trip. It includes 15mA range for testing on circuits protected by Ground Fault Interrupters (GFIs).
The BD7 also displays the maximum prospective ground fault current that can be expected at any point on the circuit. The instrument is used to test ground paths for adequate fault clearance, and to properly size circuit breakers, fuses, and other protective devices. The BD7 meets the requirements of IEC 1010-1, Installation Category III for phase-to-ground voltages up to 300 V eliminating the need for expensive fused test leads.
Features
Test Phase-Ground, Phase-Neutral and Phase-Phase supply loops
Direct readout of Perspective Short Circuit Current & Perspective Ground Fault Current
Makes Measurements on supplies from 50V to 263 V
SPECIFICATIONS
Ranges
20Ω (23 A nominal)
0.01Ω - 19.9Ω ± 2% ± 3 digits (230 V supply)
± 5% ± 6 digits (70 V supply)
200Ω/ 2k Ω (15mA nominal)
1 Ω - 1.99 k Ω ± 2% ± 1 digit (230 V supply)
± 5% ± 2 digits (70 V supply)
When Set to 1, 1 Ω Rresolution
± 2% ± 3 digits (230 V supply)
(± 3 digits at 1 typical)
PSCC (23 A nominal)
9.01 – 0.99 kA
– 19.9 k A
Note: Calibration includes the test leads and plug. To maintain accuracy, these must not be changed. See note overleaf.
Nominal System Voltage
70V/230V at 50Hz
Voltage Accuracy
±2% ±2 digits (when L-PE neon indicates)
Power Supply
4 x 1.5 V Alkaline cells IEC LR6 type
Or
4 x 1.2 V NiCd or NIMH rechargeable cells
Auto Shut Off
After 5 minutes of instrument inactivity
Battery Life
Typically 1200, one minute tests
CAT NO.
MODEL
DEscRIPTION
AVAIL
PRICE
BD7
LT7/NA
AC Loop Impedance Tester
Yes
1,695,600
Included Accessories: EV6172-372 User guide, EV6420-092 Test and carry case, EV6231-591 2 wire lead set, and EV6220-643 Power cord test lead.
BD121252
EV6229-721
OPTIONAL Earth Bond lead set FOR Megger® Digital Loop Impedance Tester
Yes
226,800
BD121700
EV6280-283
OPTIONAL Alligator clip (red) for use with 2-wire lead set FOR Megger® Digital Loop Impedance Tester
Yes
17,280
BD121254
EV6280-284
OPTIONAL Alligator clip (red) for use with 2-wire lead set FOR Megger® Digital Loop Impedance Tester
Yes
17,280
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