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7.3 Protective conductor current and contact current by means of alternative leakage
current measurement method
Measuring range
0.10 mA - 20 mA
Testing voltage:
Testing current:
7.4 Cord test
- measurement of the protective conductor resistance according to 7.1
- measurement of the insulating resistance according to 7.2
- line break testing of the external conductor (L) and the neutral conductor (N)
- short-circuit testing of the external conductor (L) and the neutral conductor (N)
7.5 Voltage measuring on external shock-proof socket
Measuring range
50 V - 270 V
AC
Display:
- voltage between the external conductor (L) and the neutral conductor (N)
- voltage between the external conductor (L) and the ground conductor (PE)
- voltage between the neutral conductor (N) and the ground conductor (PE)
7.6 Limiting values according to DIN VDE 0701/ 0702 and ÖVE/ ÖNORM E 8701-1
Note:
for cords with rated current ≤ 16 A:
Protective
conductor
resistance
R
PE
Insulating
resistance
R
ISO
Protective
conductor
current
I
EA
Contact
current
I
EA
8.
Making measurements with the BENNING ST 710
8.1 Preparations for making measurements
Operate and store the BENNING ST 710 only at the specified storage and operating tempera-
tures conditions. Do not permanently expose the device to sunlight.
-
Check rated voltage and rated current details specified on the safety measuring lines.
-
Strong sources of interference in the vicinity of the BENNING ST 710 can lead to unstable
readings and measuring errors.
Before starting the BENNING ST 710, always check the device, the lines and the
test object for damages.
Before starting the test, switch the test object on (mains switch ON).
01/ 2009
Resolution
1 V
Protection class I
≤ 0.3 Ω up to a length of 5 m,
per further 7.5 m:
a dditional 0.1 Ω, max. 1 Ω,
For cords with higher rated
currents the calculated ohmic
resistance value applies.
≥ 1 MΩ
≥ 2 MΩ for proving safe
disconnection (transformer)
≥ 0.3 MΩ for devices
with heating element
≤ 3.5 mA
on conductive parts with
PE connection
1 mA/ kW for devices with
heating elements P > 3.5 kW
≤ 0.5 mA
on conductive parts
without PE connection
BENNING ST 710
Resolution
0.01 mA
40 V
< 5 mA at 2 kΩ
Measuring accuracy
< 5 % of the upper mea-
suring range value
Protection class II, III
(protection class II),
≥ 0,25 MΩ
(protection class III),
≤ 0.5 mA
on conductive parts
without PE connection
Measuring accuracy
5 % ± 2 Digit
, 50 Hz
AC
Overload protection
300 V
(see protection
≥ 2 MΩ
Line test
≤ 0.3 Ω
class I)
≥ 1 MΩ
14
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