07/ 2018
BENNING ST 710
14
7.3 Protective conductor current and contact current by means of alternative leakage
current measurement method
Measuring range
Resolution
Measuring accuracy
0.10 mA - 20 mA
0.01 mA
5 % ± 2 digits
Testing voltage:
40 V
AC
, 50 Hz
Testing current:
< 5 mA at 2 kΩ
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)
- Testing for inversion of the external conductor (L) and the neutral conductor (N)
7.5 Voltage measuring on external shock-proof socket
Measuring range
Resolution
Measuring accuracy
Overload protection
50 V - 270 V
AC
1 V
< 5 %
of the upper mea-
suring range value
300 V
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:
Protection class I
Protection class II, III
Line test
Protective
conductor
resistance
R
PE
for cords with rated current ≤ 16 A:
≤ 0.3 Ω
up to a length of 5 m,
per further 7.5 m:
additional 0.1 Ω, max. 1 Ω,
For cords with higher rated
currents the calculated ohmic
resistance value applies.
≤ 0.3 Ω
(see protection
class I)
Insulating
resistance
R
ISO
≥ 1 MΩ
≥ 2 MΩ for proving safe
disconnection (transformer)
≥ 0.3 MΩ for devices
with heating element
≥ 2 MΩ
(protection class II)
,
≥ 0,25 MΩ
(protection class III),
≥ 1 MΩ
Protective
conductor
current
I
EA
≤ 3.5 mA
on conductive parts with
PE connection
1 mA/ kW for devices with
heating elements P > 3.5 kW
Contact
current
I
EA
≤ 0.5 mA
on conductive parts
without PE connection
≤ 0.5 mA
on conductive parts
without PE connection
8. Measuring with the BENNING ST 710
8.1 Preparations for measuring
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 leads.
- Strong sources of interference in the vicinity of the BENNING ST 710 might 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).
