User manual

VDE 0100-compliant demonstration case

5.6 Earthing resistance

Three-wire measuring method with two probes (earth rod)

Warning:

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Starting conditions:

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MP E C

R c R p R E

d>5d

Switch position at the BENNING IT 110 / IT 120:

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Note:

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safety measure.

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between the earth connection E and an auxiliary earth connection H in a distance of at least

20 m. The testing current IP thus produced causes a voltage drop at the earth connection E which

is measured by means of the probe S. The probe S must not be placed in the cone of the voltage

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earth connection H and the probe S can be arranged as an equilateral triangle with an edge length

of 20 m.

The connections of the earth connection R

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measured values.

Limiting values:

- Please ask your local distribution network operator for the earthing resistances depending on the

network system.

- see DIN VDE 0100, Part 610, table NA.3,

- see DIN VDE 0100, Part 410

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