Manual Benning IT 120B (page 76 of 80) (English)

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12.3.4 Loop resistance and prospective fault current

ThedenitionofthenominalvoltageforcalculatingI

PFC

ismodiedasfollows:

- 55 V for selection of a single-phase center-tapped network,

- 63 V for selection of a three-phase network.

The test can be carried out for both combinations (L1-PE and L2-PE). For each individual test re-

sult, the corresponding indication is shown.

Nominal input voltages:

Nominal input voltage U

Voltage range

single-phase network, 55 V (44V≤U≤61V)

three-phase network, 63 V (56V≤U≤70V)

If the input voltage is outside this range, this is displayed on the online voltage / terminal monitor

together with the symbol.

12.4 Technical data

Here, only technical data are listed which differ from the data in chapter 9.

12.4.1 FI/RCD Testing

General data

Nominal fault current

10 mA, 30 mA, 100 mA, 300 mA, 500 mA, 1000 mA

Accuracy of the nominal fault current 0 / + 0.1 × I

∆

; I

∆

= I

∆N

. 2 × I

∆N

. 5 × I

∆N

- 0.1 I

∆

/ + 0; I

∆

= ½ × I

∆N

Maximum nominal differential current

forthespeciedaccuracy   1000mAfürI

∆N

       500mAfür2× I

∆N

       100mAfür5× I

∆N

Maximumtestingcurrent   1A(forZ-LOOP<1Ω)

Wave form of the testing current sine waves (AC), pulsating (A)

DC shift for pulsating testing current 6 mA (typical)

Type of FI/RCD standard (G, undelayed), selective (S, delayed)

Initial polarity of the testing current 0° or 180 °C

Nominal input voltage 55 V / 63 V (45 Hz ÷ 65 Hz)

Contact voltage

In compliance with EN61557-6, the measuring range for the limiting contact voltage of 25 V goes

from 3.0 V to 32.6 V.

In compliance with EN61557-6, the measuring range for the limiting contact voltage of 50 V goes

from 3.0 V to 66.0 V.

Measuring range (V) Resolution (V) Accuracy

0.0 - 9.9 0.1 (- 0 %/ + 15 % of reading + 2 digits)

10.0 - 99.9 0.1 (- 0 %/ + 15 % of reading)

Understandardconditions,theaccuracyshallapplyforoneyear.Thetemperaturecoefcientout-

side these limiting values is +1 digit.

Testing current max. 0.5 × I

∆N

when mesuring lightihg earth protection instrument show that is not cinected. why.
Submitted on 12-8-2023 at 22:36
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Benning IT 120B Manual

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