IEC 62151:2000

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Definitions
4 TNV circuits
      4.1 TNV-0 circuits
      4.2 TNV-1, TNV-2 and TNV-3 circuits
5 Protection of telecommunication network service
      personnel, and users of other equipment connected to
      the network, from hazards in the equipment
      5.1 General
      5.2 Use of protective earthing
      5.3 Separation of the telecommunication network
             from earth
      5.4 Limitation of the touch current to a
             telecommunication network
6 Protection of equipment users from overvoltages on
      telecommunication networks
      6.1 Separation requirements
      6.2 Electric strength test procedure
7 Protection of the telecommunication wiring system from
      overheating
Annex A (normative) Criteria for telephone ringing signals
                    (see.4.2.1.1)
Annex B (normative) Impulse test generator (see 6.2.1)
Annex C (informative) Procedure for impulse testing (see
                      6.2.3)
Bibliography
Figure 1 - Maximum voltages permitted after a single fault
Figure 2 - Test generator
Figure 3 - Test probe
Figure 4 - Test for separation between a telecommunication
           network and earth
Figure 5 - Test circuit for touch current of single-phase
           equipment on a star TN to TT power supply system
Figure 6 - Test circuit for touch current of three-phase
           equipment on a star TN or TT power supply system
Figure 7 - Application points of test voltage
Figure A.1 - Definition of ringing period and cadence cycle
Figure A.2 - ITS1 limit curve for cadenced ringing signal
Figure A.3 - Peak and peak-to-peak currents
Figure A.4 - Ringing voltage trip criteria
Figure B.1 - Impulse generating circuit
Figure C.1 - Waveform on insulation without surge suppressors
             and no breakdown
Figure C.2 - Waveforms on insulation during breakdown without
             surge suppressors
Figure C.3 - Waveforms on insulation with surge suppressors
             in operation
Figure C.4 - Waveform on short-circuited surge suppressor and
             insulation
Table 1 - Voltage ranges of TNV circuits
Table 2 - Separation of TNV circuits

IEC 62151:2000 Applicable to equipment designed and intended to be connected directly to a Telecommunication Network, regardless of the source of power. This basic safety publication is primarily intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51. It is not intended for use by manufacturers or certification bodies. This standard has the status of a basic safety publication in accordance with IEC Guide 104 and ISO/IEC guide 51. This standard cancels and replaces IEC Guide 105 published in 1985. The contents of the corrigenda of March 2001 and June 2001 have been included in this copy.