Manual Benning ST 725 (page 35 of 71) (English, German, French)

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01/ 2015

BENNING ST 725



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 + 3.1 %

7.6 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)

7.7 Tripping time measurement of RCDs

Measuring range Resolution Measuring accuracy

10 ms - 500 ms 1 ms 5 % ± 2 digits

Testing current / polarity:

30 mA sinussoidal/0° and 180°

150 mA sinussoidal /0° and 180°

Preset limiting value: 200 ms (30 mA), 40 ms (150 mA)

7.8 Protective conductor current (direct measurement method) (optional measuring

adapters 044140 or 044141)

Measuring range Resolution Measuring accuracy

0.25 mA - 9.99 mA 0.01 mA 5 % ± 2 digits

Nominal voltage:

3 x 400 V ± 10 % (as mains feed-in)

Rated current:

16 A or 32 A

Preset limiting value:

3.5 mA

7.9 Voltage measuring on external shock-proof socket

Measuring range Resolution Measuring accuracy Overload protection

50 V - 270 V

1 V 5 % ± 2 digits 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)

7.10 Limiting values according to DIN VDE 0701-0702 and ÖVE/ ÖNORM E 8701-1

Note:

Limiting values preset in bold are stored in the BENNING ST 725.

Protection class I

Protection class

II, III

Line test

Protective

conductor

resistance

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 cur-

rents the calculated ohmic resistance

value applies.

≤ 0,3 Ω

(see protection

class I)

Insulating

resistance

ISO

≥ 1 MΩ

≥2MΩforprovingsafedisconnec-

tion (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

LEAK

≤ 3.5 mA

on conductive parts with PE con-

nection

1 mA/ kW for devices with heating

elements P > 3.5 kW

Contact

current

/ I

LEAK

≤ 0.5 mA

on conductive parts without

PE connection

≤ 0.5 mA

on conductive parts

without

PE connection

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Benning ST 725 Manual

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