Benning ST 725 - Electrical Specifications; Protective Conductor Resistance; Insulating Resistance; Protective Conductor & Contact Current (Alternative Method)

07/ 2018 BENNING ST 725
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7.1 Protective conductor resistance
Measuring range Resolution Measuring accuracy
0.05Ω-19.99Ω 0.01Ω 5 % ± 2 digits
Testing current: >200mA(2Ω)
Open-circuit voltage: 4 V - 9 V
Preset limiting value: 0.3Ω
7.2 Insulating resistance
Measuring range Resolution Measuring accuracy
0.1MΩ-19.99MΩ 0.01MΩ 5 % ± 2 digits
Testing voltage: 250 V
DC
/ 500 V
DC
, + 20 %, - 0 %
Testing current: >1mA,<2mAat2kΩ
Preset limiting value: 1MΩ(protectionclassI),2MΩ(protectionclassII)
7.3 Protective conductor current and contact current by means of alternative leakage
current measurement method
Measuring range Resolution Measuring accuracy
0.25 mA - 19.99 mA 0.01 mA 5 % ± 2 digits
Testing voltage: 40 V
AC
, 50 Hz
Testing current: <10mAat2kΩ
Preset limiting value: 3.5 mA (protection class I), 0.5 mA (protection class II)
7.4 Protective conductor current (differential current measurement method)
Measuring range Resolution Measuring accuracy
0.25 mA - 19.99 mA 0.01 mA 5 % ± 2 digits
Nominal voltage: 230 V ± 10 % (as mains feed-in)
Rated current: 16 A
Max. breaking capacity: 3000 VA
Max. lamp load: 1000 W
Max. measuring duration: 30 seconds
Preset limiting value: 3.5 mA (protection class I)
Resistance to external voltages: max. 276 V
For non-sinusoidal current supply, an additional error has to be considered:
crest factor of > 1.4 to 2.0, additional error + 0.4 %
Externalmagneticeldsmightinuencethemeasuringresultadditionally.
7.5 Contact current (direct measurement method)
Measuring range Resolution Measuring accuracy
0.1 mA - 1.99 mA 0.01 mA 5 % ± 2 digits
Nominal voltage: 230 V ± 10 % (as mains feed-in)
Rated current: 16 A
Max. breaking capacity: 3000 VA
Max. lamp load: 1000 W
Max. measuring duration: 30 seconds
Preset limiting value: 0.5 mA (protection class II)