EN 50065-7:2001

SLOVENSKI STANDARD
01-februar-2003
Signalling on low-voltage electrical installations in the frequency range 3 kHz to
148,5 kHz - Part 7: Equipment impedance
Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5
kHz -- Part 7: Equipment impedance
Signalübertragung auf elektrischen Niederspannungsnetzen im Frequenzbereich 3 kHz
bis 148,5 kHz -- Teil 7: Geräteimpedanzen
Transmission de signaux sur les réseaux électriques basse tension dans la bande de
fréquences de 3 kHz à 148,5 kHz -- Partie 7: Impédance des appareils
Ta slovenski standard je istoveten z: EN 50065-7:2001
ICS:
33.040.30 Komutacijski in signalizacijski Switching and signalling
sistem systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50065-7
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2001
ICS 33.040.30
English version
Signalling on low-voltage electrical installations
in the frequency range 3 kHz to 148,5 kHz
Part 7: Equipment impedance
Transmission de signaux sur les réseaux Signalübertragung auf elektrischen
électriques basse tension dans la bande Niederspannungsnetzen im
de fréquences de 3 kHz à 148,5 kHz Frequenzbereich 3 kHz bis 148,5 kHz
Partie 7: Impédance des appareils Teil 7: Geräteimpedanzen
This European Standard was approved by CENELEC on 2000-08-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50065-7:2001 E
Foreword
This European Standard was prepared by SC 205A, Mains communicating systems, of Technical
Committee CENELEC TC 205, Home and Building Electronic Systems (HBES).
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 50065-7 on 2000-08-01.
The following dates were fixed :
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2002-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2003-04-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annexes A, B, C and D are informative.
EN 50065 consists of the following parts, under the general title: Signalling on low voltage
electrical installations in the frequency range 3 kHz to 148,5 kHz
Part 1 General requirements, frequency bands and electromagnetic disturbances
Part 2-1 Immunity requirements for mains communications equipment and systems
operating in the range of frequencies 95 kHz to 148,5 kHz and intended for
use in residential, commercial and light industrial environments
Part 2-2 Immunity requirements for mains communications equipment and systems
operating in the range of frequencies 95 kHz to 148,5 kHz and intended for
use in industrial environments
Part 2-3 Immunity requirements for mains communications equipment and systems
operating in the range of frequencies 3 kHz to 95 kHz and intended for use
by electricity suppliers and distributors
Part 4-1 Low voltage decoupling filters – Generic specification
Part 4-2 Low voltage decoupling filters – Safety requirements
Part 4-3 Low voltage decoupling filters – Incoming filter
Part 4-4 Low voltage decoupling filters – Impedance filter
Part 4-5 Low voltage decoupling filters – Segmentation filter
Part 4-6 Low voltage decoupling filters – Phase coupler
Part 7 Equipment impedance
_________
- 3 - EN 50065-7:2001
Contents
Introduction.4
1 Scope.5
2 Normative references.5
3 Definitions .5
4 Requirements.6
5 Test method .7
5.1 General.7
5.2 Test conditions.7
5.3 Impedance analyser measuring method .8
5.4 Voltage ratio method .9
Annex A (informative) Signalling on low voltage electrical installations in the
frequency range 3 kHz to 148,5 kHz, potential problems .13
Annex B (informative) Minimum value of the equipment impedance .15
B.1 Consumer's network impedance.15
B.2 Type 1 & 2 equipment impedance versus environment .15
B.3 Minimum value of the equipment impedance .16
B.3.1 Table 1.16
B.3.2 Table 2.16
B.3.3 Table 3.17
B.3.4 Table 4.17
Annex C (informative) Impedance measurement method with impedance analyser .18
C.1 Theory .18
C.2 Practice.19
Annex D (informative) Analysis of voltage ratio method for impedance measurement.21
D.1 Introduction .21
D.2 Principle of the voltage ratio method.21
D.3 Measuring notes.23

Introduction
Mains communication equipment connected to the low voltage network will load the mains with
their inherent impedance.
In general, many types of equipment connected to the same low voltage communication
network will present a summative load impedance for transmitters injecting signals onto the
mains network.
As a result, the mains impedance, which is time variable, will in general decrease and the
attenuation increase, deteriorating the communication over the mains network.
The aim of this standard is to limit the deterioration in communication due to the contribution of
the loads formed by other communication equipment connected to the same low voltage
network and operating in the same frequency band or adjacent frequency bands.
This standard will therefore specify the suitable minimum impedance (modulus) of the
communication equipment impedance in this operating frequency range for both transmitting
and receiving mode in order to minimise mutual interference.
An informative annex is included with this part of the standard, identifying characteristics that
can influence performance of equipment connected to the same mains network.

- 5 - EN 50065-7:2001
1 Scope
This standard applies to electrical equipment, excluding decoupling filters, using signals in the
frequency range 3 kHz to 148,5 kHz for data transmission on low voltage electrical networks,
either on the public supply network or within installations in consumers' premises.
It specifies requirements for mains communication equipment with respect to the load
impedance of the mains.
It does not specify the impedance of external components that are not necessary for the normal
functioning of the communication equipment.
2 Normative references
This European Standard incorporates, by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions
of any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references, the latest edition of the publication referred to
applies (including amendments).
EN 50065-1 Signalling on low voltage electrical installations in the frequency range
3 kHz to 148,5 kHz –
Part 1: General requirements, frequency bands and electromagnetic
disturbances
CISPR 16-1 Specification for radio disturbance and immunity measuring apparatus
and methods -
Part 1: Radio disturbance and immunity measuring apparatus
IEC 60050-161 International Electrotechnical Vocabulary –
Chapter 161: Electromagnetic compatibility
3 Definitions
For the purpose of this standard the following definitions apply. Further, the definitions given in
the International Electrical Vocabulary IEC 60050-161 apply.
3.1
Type 1 equipment
the equipment using signals in the frequency range 3 kHz to 95 kHz (see 4.1 of EN 50065-1)
3.2
Type 2 equipment
the equipment using signals in the frequency range 95 kHz to 148,5 kHz (see 4.2 of
EN 50065-1)
3.3
bandwidth, BW
see 6.2.1 of EN 50065-1
4 Requirements
The minimum values of the impedance modulus for Type 1 equipment and Type 2 equipment,
either in receiving operating mode (RX) and transmitting operating mode (TX), are defined in the
following tables.
The abbreviations “Out BW” and “In BW” (for BW, see 3.3) in Table 2 mean “outside the
bandwidth” and “inside the bandwidth” respectively.
For example, a system operating in the frequency range from 40 kHz to 60 kHz has an inside
bandwidth of 20 kHz and the outside bandwidth range from 3 kHz to 40 kHz and from 60 kHz to
95 kHz.
These requirements apply for the design of equipment satisfying the impedance requirements
for both Type 1 and Type 2. If the impedance requirements (see Tables 1, 2, 3 and 4) are not
satisfied, an appropriate decoupling filter shall be used.
Table 1 – Minimum impedance modulus value �Ze� of Type 1 equipment
working in the frequency range 3 kHz to 9 kHz
Frequency range 3 kHz to 9 kHz 9 kHz to 95 kHz 95 kHz to 148,5 kHz
Operating mode RX TX RX TX RX TX
�Ze� Free Free
10 � 10 � 10 � 10 �
Table 2 - Minimum impedance modulus value �Ze� of Type 1 equipment
working in the frequency range 9 kHz to 95 kHz
Frequency range 3 kHz to 9 kHz 9 kHz to 95 kHz 95 kHz to 148,5 kHz
Operating mode RX TX RX TX RX TX
Free Out BW In BW Free
�Ze� 10 � 5 � 3 �
1)
Free
50 �
1)
The free value is indicated for single system. For multiple systems, that is when more than one system
operates in the same frequency range on the same network, a finite minimum impedance modulus value of
10 � is recommended.
- 7 - EN 50065-7:2001
Table 3 - Minimum impedance modulus value �Ze� of Type 2 equipment
working in the frequency range 95 kHz to 148,5 kHz
Frequency range 3 kHz to 9 kHz 9 kHz to 95 kHz 95 kHz to 148,5 kHz
Operating mode RX TX RX TX RX TX
Free
�Ze� 10 � 10 � 5 � 5 � 5 �
Table 4 - Minimum impedance modulus value �Ze� of Type 2 equipment working
1)
in the frequency range 3 kHz to 9 kHz using the common mode signalling
Frequency range 3 kHz to 9 kHz 9 kHz to 95 kHz 95 kHz to 148,5 kHz
Operating mode RX TX RX TX RX TX
Free
�Ze� 5 � 5 � 5 � 10 � 10 �
1)
Common-mode injection devices may disturb the normal operation of residual current protection devices and
cause serious safety hazards to the user. Therefore, common-mode injection shall not be used unless
otherwise explicitly allowed in local regulations (see EN 50065-1).
These impedance values have to be measured in accordance with clause 5.
5 Test method
5.1 General
Two test methods are proposed the "impedance analyser method" and the "voltage ratio
method".
The "impedance analyser method" allows the measurement of real and imaginary parts of the
impedance of the device under test (DUT). This method is the reference method.
The "voltage ratio method" only indicates if the modulus of the impedance of the DUT is above
or below the limit.
5.2 Test conditions
The mains communication equipment (DUT) shall be connected with all external components
that are necessary for operation.
For mains communication equipment incorporated in appliances, the test must be carried out
only on the communication equipment.
The test must be carried out with respect to in band and out of band frequency range which the
communication equipment operates.

The DUT impedance shall be measured in receiving operating mode (RX) and transmitting
operating mode (TX).
5.3 Impedance analyser measuring method
The value of the impedance of the Device Under Test (DUT) shall be measured using an
indirect method based on the use of the artificial mains, CISPR 16-1 V-network, defined in
EN 50065-1.
This method applies to devices working in differential mode.
The measuring equipment is shown in Figure 1. The transformer is necessary to provide the
galvanic isolation between the LV mains neutral (N) and the ground (GND) of the CISPR 16-1
V-network.
The earth termination of the device under test, when this termination is present, shall not be
connected to the ground termination (GND) of the artificial mains network.
CISPR 16-1
L
DUT
V-network
GND
LV MAINS
N
N
1:1
measuring
Z (f)
DUT
receiver
Impedance
analyser
Figure 1 - Block diagram of the measuring set-up
The impedance of the DUT is calculated as follows :
- step 1: evaluation of the Z-parameters (Z , Z , Z , Z ) of the CISPR 16-1 V-network as
11 22 12 21
a two port network (see annex C);
- step 2: measurement of the input impedance (Z (f)) when the DUT is connected to the
m
V-network output port;
- step 3: calculation of Z (f) using the Z-parameters and Z (f).
DUT m
In annex C, a possible calculation method is shown using the Z-parameters.

- 9 - EN 50065-7:2001
5.4 Voltage ratio method
The measuring method is based on the use of the artificial mains, CISPR 16-1 V-network
defined in EN 50065-1 for measuring the output voltage of the mains communication devices.
This method does not apply to devices working in common mode.
The measuring equipment for measuring the signal output voltage, as defined in EN 50065-1, is
replaced by a signal generator having an output impedance of 50 �, working at the measuring
frequency and having an output voltage not exceeding 100 dB(�
...