Product manual

System description, Safety aspects of the DCT1800-GAP system
Technical Product Manual - DCT1800-GAP
TD 92093 (1/LZBNB 103 108 R4D) / 2006-03-09/ Ver.C
© 2006
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Chapter 4 Safety aspects of the DCT1800-GAP system
The DCT1800-GAP system meets the safety standards EN41003 and EN60950/IEC950. The system
is a pluggable equipment class A according to EN60950/IEC950. The system is class I equipment,
with class II insulation between primary and secondary circuits. Connection to protective earth is
necessary for safety reasons.
The secondary circuits are SELV circuits according EN60950/IEC950. The ‘common’ of the secondary
SELV circuits is connected to earth.
The safety status of the different interconnection points of the system is as follows:
• RS232A, RS232B port: SELV circuits
• Analogue Line Termination Unit (LTU) connections: TNV circuits
• Power failure and general alarm contacts: SELV circuits
• Digital Trunk Unit (DTU) connection: TNV circuits *)
• Base station connections: TNV circuits *)
• Battery power supply connections: SELV circuit
The analogue line termination circuits are separated from the secondary SELV circuit by basic
insulation.
*) Operating within the limits of SELV circuits.