Conductix-Wampfler ProfiDAT compact Mounting Instructions page 51

Mounting Instructions
ProfiDAT compact
®
Data Transmission System
Program 0515
6.3.1 TN grid
→ In the TN grid, ProfiDAT
transformer through a cable.
→ To ensure that the protective device of the conductor rail is switched off in the event of a fault, the total resistance of the
system between the phase conductor and PE conductor must be checked. The maximum permissible total resistance is
calculated using the formula:
���� ≤
����
Z = The impedance of the fault loop including current source of the active conductor up to the fault location and the protective
s
conductor between the fault location and the current source.
I = The current that causes the protective device to switch off automatically within the specified time.
a
U = The nominal AC voltage toward the end.
0
For the measurement, the phase conductor and the PE conductor must be short-circuited at the end of the conductor rail;
measurements are taken at the output of the protective device or the following output clamps (connection terminals of the
conductor rail supply line).
Example of maximum permissible total resistance for the conductor rail system 0815 with ProfiDAT
Power supply 400 V, short-circuit current circuit breaker 100 A according to Data Sheet 500 A
���� ≤ =
���� 400���� / √3
0
����
���� 500 ����
����
MAL0515-0001i-EN
www.conductix.com
compact rail (ground conductor rail) is directly connected to the grounded star point of the supply
®
����
0
����
����
= 0.46 Ω
Translated from MAL0515-0001k-DE
���� × ���� ≤ ����
���� ���� 0
®
compact:
Page 51 of 169