VOLTWERK VC 200 Instrucciones De Servicio página 155

Result
Transformerless central inverter
The earthing resistance is the electrical resistance between the protective
earth connection and the reference potential of the ground. Earthing
resistance is measured by running an alternating current over the earthing
conductor, the earth electrode and the earth-spreading resistor. It can be
measured either directly or indirectly. For direct measurement, an earth
probe is required. For indirect measurement, the approximate earthing
resistance is determined using an 'earth-electrode loop resistance
measurement', without the use of a probe.
≤
R U /I
A L F
R Earthing resistance (protective earth)
|
A
U Contact voltage
|
L
I Residual current
|
F
10. Measure the earthing resistance. To do this, follow the instructions in
the measuring equipment operating manual.
11. Close internal circuit breakers.
12. Close the front door.
13. Close external disconnectors.
The measurements have been completed.
Operating manual
5 Installation
65