Protection Of External Lines And Extensions; Figure 4-33 Protection And Grounding Connection Diagram - Siemens hipath 1100 Service Manual

For internal distribution only
Recommendations concerning the Power Supply and Protection of the System

4.12.1 Protection of External Lines and Extensions

The primary protection of external lines and extensions must be provided by ground-
ing the system through a separate cable (minimum section = 2.5 mm
sively for the protection of the telephone system. The secondary protection of exter-
nal lines and extensions is between wires A and B.
For primary protection for a distribution box that is external to the PABX use a
MPT250 shield with two PTCs (A and B wires) for overcurrent protection along with
a gas capsule connected to the ground wire through a separate cable that is indepen-
dent of the cable used for grounding the power supply.
The connection between the HiPath 1100 system and the distribution box must be
made using multipair cables, preferably foil shielded. This type of flat cable has a spe-
cial grounding wire that must be connected to the safety ground, but only at the dis-
tribution box end.
For the RSA version the primary protection for external lines and extensions must
be provided according to local regulations.
Figure 4-33
A31003-K1250-S100-12-7619
HiPath 1100, Service Manual
Protection and Grounding Connection Diagram
Installation
2
) set up exclu-
4-43