EN 50438:2007

SLOVENSKI STANDARD
01-maj-2008
Zahteve za vzporedno vezavo mikro generatorjev z javnim nizkonapetostnim
razdelilnim omrežjem
Requirements for the connection of micro-generators in parallel with public low-voltage
distribution networks
Anforderungen für den Anschluss von Kleinst-Generatoren an das öffentliche
Niederspannungsnetz
Prescriptions pour le raccordement de micro-générateurs en parallèle avec les réseaux
publics de distribution à basse tension
Ta slovenski standard je istoveten z: EN 50438:2007
ICS:
29.160.20 Generatorji Generators
29.240.01 2PUHåMD]DSUHQRVLQ Power transmission and
GLVWULEXFLMRHOHNWULþQHHQHUJLMH distribution networks in
QDVSORãQR general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50438
NORME EUROPÉENNE
December 2007
EUROPÄISCHE NORM
ICS 29.160.20
English version
Requirements for the connection of micro-generators
in parallel with public low-voltage distribution networks

Prescriptions pour le raccordement  Anforderungen für den Anschluss von
de micro-générateurs en parallèle Kleinst-Generatoren an das öffentliche
avec les réseaux publics de distribution Niederspannungsnetz
à basse tension
This European Standard was approved by CENELEC on 2007-09-11. 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, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the 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

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50438:2007 E
Foreword
This European Standard was prepared by WG 2 of the Technical Committee CENELEC TC 8X, System
aspects for electrical energy supply.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50438
on 2007-09-11.
This European Standard supersedes CWA 14642:2003.
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) 2008-10-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-10-01
__________
- 3 - EN 50438:2007
Contents
1 Scope. 5
2 Normative references. 6
3 Terms and definitions . 7
4 Connection requirements. 9
4.1 The electrical installation. 9
4.1.1 Installation instructions. 9
4.1.2 Over-current protection. 9
4.1.3 Earthing. 9
4.2 Interface protection .10
4.2.1 General .10
4.2.2 Interface protection settings.11
4.2.3 Loss of Mains (LoM) protection.11
4.2.4 Automatic reconnection after a network outage.12
4.2.5 Synchronisation.12
5 Power quality.12
5.1 Electromagnetic emission / immunity.12
5.2 DC injection .12
5.3 Power factor .12
6 Operation and safety of the micro-generator .13
6.1 General.13
6.2 Safety .13
6.3 Information plate.13
6.4 Labelling.13
6.5 Maintenance and routine testing.14
7 Commissioning.14
7.1 General.14
7.2 Installation .15
7.3 Notification procedure .15
7.3.1 Inform and Fit for a single installation.15
7.3.2 Multiple / planned installation.15
7.4 Decommission arrangements.15
7.5 Replacement arrangements .16
Annex A (normative) Interface protection settings, national deviations .17
AT – Austria.17
BE – Belgium.18
CH – Switzerland.20
CY – Cyprus .21
CZ – Czech Republic.22
DE – Germany.23
DK – Denmark.24
ES – Spain .25
FI – Finland .27
FR – France .28

GB – United Kingdom .29
IE – Ireland.30
IT – Italy .31
NL – The Netherlands.32
NO – Norway.33
PL – Poland.34
SE – Sweden.35
SI – Slovenia .36
Annex B (informative) Notification sheets.37
B.1 Notification of a micro-generation installation.37
B.2 Application for connection of multiple micro-generators .39
B.3 Notification of micro-generator decommissioning.41
Annex C (informative) Interface protection – Compliance type testing general arrangements .42
C.1 Compliance testing .42
C.2 Type testing of the interface protection.42
C.3 Type testing.45
Annex D (informative) Type certification test results sheet .46
Annex E (normative) Countries allowing extension of the scope > 16 A .50
CY – Cyprus .50
FI – Finland .50
IE – Ireland.50
Annex F (informative) Abbreviations.51
Annex G (informative) A-deviations .52
Bibliography .53

Figure 1 – Example of a warning label both for size and content.14
Figure C.1 – LoM test arrangement .44
Figure C.2 – Power factor test arrangement .45

Table 1 – Countries allowing or not allowing Inform and Fit. 5
Table 2 – Default interface protection settings .11
Table 3 – Product family emission standards.12

- 5 - EN 50438:2007
1 Scope
This European Standard specifies technical requirements for connection and operation of fixed
installed micro-generators and their protection devices, irrespective of the micro-generators primary
source of energy, in parallel with public low-voltage distribution networks, where micro-generation
refers to equipment rated up to and including 16 A per phase, single or multi phase 230/400 V or multi
phase 230 V (phase-to-phase voltage).
This European Standard is intended for installation mainly in the domestic market.
In some countries this document may be applied to generators with higher ratings used mostly in
domestic and small commercial installations. These countries are listed in Annex E.
Whenever the scope is extended to equipment rated greater than 16 A per phase additional standards
could be applicable.
Inform and Fit is the recommended procedure for installation of micro-generation except in those
countries where legislation precludes this approach e.g. where it is mandatory for the DNO to give
prior permission for the connection.
Table 1 – Countries allowing or not allowing Inform and Fit
Inform and Fit Inform and Fit
Code Country Allowed Not Code Country Allowed Not
allowed allowed
AT Austria x IS Iceland x
BE Belgium x IT Italy x
CH Switzerland x LT Lithuania x
CY Cyprus x LU Luxembourg x
CZ Czech Republic x LV Latvia x
DE Germany x MT Malta x
DK Denmark x NL Netherlands x
EE Estonia x NO Norway x
ES Spain x PL Poland x
FI Finland x PT Portugal x
FR France  x RO Romania x
GB United Kingdom x SI Slovenia x
GR Greece x SE Sweden x
HU Hungary x SK Slovakia x
IE Ireland x
The electrical interface is the principal focus and this includes the method of connection, the settings
and protection requirements for connection, the operation of the electrical interface under normal
conditions, emergency shutdown, distribution network-independent operation, start-up and distribution
network synchronisation.
The provisions of this European Standard are not intended to ensure by themselves the safety of DNO
personnel or their contracted parties.

The intention of this European Standard is to ensure that the micro-generator satisfies appropriate
provisions for
• the requirements of the DNO e.g. the distribution network protection,
• information to electricians working inside the house,
• quality of supply.
The following aspects are included in the scope:
• all micro-generation technologies are applicable.
The following aspects are excluded from the scope:
• multiple units that for one installation, in aggregate, exceed 16 A;
• issues of revenue rebalancing, metering or other commercial matters;
• generators never to be connected to the supply networks;
• requirements related to the primary energy source e.g. matters related to gas fired generator units;
• intended network independent operation.
NOTE  If independent operation is intended, generally preliminary agreement of the DNO shall be obtained, however this is out
of the scope of this document. Specific additional requirements most likely could be applicable.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 50110 series Operation of electrical installations
EN 50160 Voltage characteristics of electricity supplied by public distribution
systems
EN 60255-6 Electrical relays – Part 6 : Measuring relays and protection
equipment (IEC 60255-6)
EN 60664-1 Insulation coordination for equipment within low-voltage systems –
Part 1: Principles, requirements and tests (IEC 60664-1)
EN 61000-3-2 Electromagnetic compatibility (EMC) – Part 3-2: Limits - Limits for
harmonic current emissions (equipment input current ≤ 16 A per
phase) (IEC 61000-3-2)
EN 61000-3-3 Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of
voltage changes, voltage fluctuations and flicker in public low-voltage
supply systems, for equipment with rated current ≤ 16 A per phase
and not subject to conditional connection (IEC 61000-3-3)
EN 61000-6-1 Electromagnetic compatibility (EMC) – Part 6-1: Generic standards –
Immunity for residential, commercial and light-industrial
environments (IEC 61000-6-1, mod.)
EN 61000-6-3 2001 Electromagnetic compatibility (EMC) – Part 6-3: Generic standards –
+ A11 2004
Emission standard for residential, commercial and light-industrial
environments (IEC 61000-6-3:1996, mod.)
HD 384 /  Electrical installations of buildings (IEC 60364 series, mod.)
HD 60364 series
IEC 60364-5-55 Electrical installations of buildings – Part 5-55: Selection and erection
of electrical equipment - Other equipment

- 7 - EN 50438:2007
1)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
clearance time
total duration between the instant when the protection system is initiated and the instant when the
cessation of supply to the network or disconnection of the micro-generator takes place
3.2
cease to energize the distribution network
termination of the operational state where the micro-generator supplies power to the distribution
network
3.3
cogeneration
combined heat and power (CHP)
combined generation of electricity and heat by an energy conversion system and the concurrent use of
the electric and thermal energy from the conversion system

NOTE  In the context of small-scale generation this concept is sometimes referred to as “domestic CHP”.
3.4
commissioning
process of putting into operation a micro-generator, apparatus, equipment, building, or facility in
accordance with the manufacturers instruction
3.5
2)
user
person with responsibility for the premises in which the micro-generator is installed, normally referred
to in other documentation as the customer / consumer / network user
3.6
decommissioning
process of removing a micro-generator, apparatus, equipment, building, or facility from operation
3.7
disconnection
separation of the active parts of the micro-generator from the network with mechanical contacts
providing at least basic insulation

NOTE  Passive components like filters, auxiliary power supply to the micro-generator and sense lines can remain connected.
3.8
LV distribution network
low voltage part of the electric power system used for the transfer of electricity within an area of
consumption to consumers
———————
1)
Where possible IEC Multilingual Dictionary (on CD) is used.
2)
Based on national regulations other terms may apply.

3.9
distribution network operator (DNO)
natural or legal person responsible for operating, ensuring the maintenance of and, if necessary,
developing the distribution network in a given area and, when applicable, its interconnections with
other systems and for ensuring the long term ability of the system to meet reasonable demands for the
distribution of electricity (DNO equals DSO, Distribution System Operator)
3.10
electrical installation
assembly of wiring and electrical equipment that is used within the domestic premises for the
distribution and/or use of electric energy
3.11
inform & fit
process of installing and commissioning a micro-generator with prior notification of the DNO, followed
by commencement of operation without the need of prior formal approval of the DNO
3.12
fuel cell
electrochemical device that converts chemical energy directly into heat and electricity
3.13
3)
installer
person who has received sufficient training to apply safe methods of work to install a micro-generator
in compliance with the requirements of this standard (in some countries it may be necessary to have
recognized qualification and/or accreditation)
3.14
interface protection
electric protection required to ensure that the micro-generator is disconnected and/or ceases to
energize for any event that could impair the integrity or degrade the safety of the distribution network
3.15
islanding
situation where a section of the electricity network, containing generation, becomes physically
disconnected from the rest of distribution detwork or user’s network and one or more generators
maintain a supply of electrical energy to the isolated network
3.16
isolation
cut off for reasons of safety from all or a discrete section of the electrical installation by separating the
electrical installation or section from every source of electrical energy
3.17
Loss of Mains (LoM) protection
protection system that will disconnect the micro-generator from the distribution network and/or ceases
to energize in the event of loss of that supply

NOTE  LoM protection will invariably involve sampling of the voltage wave form. In the event of a LoM situation, this sampling
will introduce a time delay before a protection initiation signal can be issued.
3.18
low voltage (LV)
for the purpose of this standard a voltage, used for the supply of electricity, whose upper limit of
nominal r.m.s. value is 1 kV
———————
3)
Based on national regulations, other terms may apply.

- 9 - EN 50438:2007
3.19
nominal voltage
single phase 230 V, multi phase 230/400 V or multi phase 230 V (phase-to-phase voltage)
3.20
micro-generator
source of electrical energy including all interface units with a rated line-conductor electric current of up
to and including 16 A low-voltage AC and designed to operate normally in parallel with a low voltage
distribution network
3.21
notification
process of informing the DNO of the commissioning of a micro-generation system, or its
decommissioning
4 Connection requirements
4.1 The electrical installation
The unit shall be connected in compliance with HD 384 series and the relevant national standards.
Low voltage electrical installations shall comply with national and local regulation whether the
installation is supplied by generation running in parallel with the distribution network, solely by the
distribution network or islanded.
4.1.1 Installation instructions
The micro-generator shall be installed and maintained in accordance with the instructions issued by
the manufacturer.
4.1.2 Over-current protection
The micro-generator installation shall be protected against over-current according to HD 384 series.
When selecting the overcurrent protection within the domestic installation it is necessary to ensure
correct discrimination with the DNO’s protection devices.
4.1.3 Earthing
Earthing shall be according to HD 384.5.54 / IEC 60364-5-55 and the relevant national standards.
When a micro-generator is operating in parallel with the distribution network, there shall be no direct
connection between the generator winding (or pole of the primary energy source in the case of a DC
sourced micro-generator) and the DNO’s earth terminal. For installations where the customer provides
his own earth terminal, e.g. when connected to a TT system, it is also advisable to avoid connecting
the generator winding to this earth terminal. The reason for this precaution is to avoid damage to the
generator during faults on the distribution network and to ensure correct operation of protective
devices.
For a micro-generator which is designed to operate in parallel with a distribution network but which is
connected via an inverter (e.g. a PV array or fuel cell) it is permissible to connect one pole of the DC
side of the inverter to the distribution network if the insulation between the AC and the DC sides of the
inverter meets the requirements of over voltage category IV as specified in EN 60664-1. In such cases
the installer / Manufacturer shall take all reasonable precautions to ensure that the micro-generator
unit will not impair the integrity of the distribution network and will not suffer unacceptable damage for
all credible operating conditions, including faults on the distribution network.

4.2 Interface protection
4.2.1 General
The purpose of the interface protection is to ensure that the connection of a micro-generator unit will
not impair the integrity or degrade the safety of the distribution network. The interface protection shall
be insensitive to normal voltage and frequency variations in the distribution network.
The interface protection, monitoring and control functions may be incorporated into the micro-
generator control system, or may be fitted as discrete separate mounted devices.
4.2.1.1 Default settings versus national settings
If no national settings are provided for a particular country (Annex A), the default settings in Table 2
shall be applied.
4.2.1.2 Response to protection operation
The interface protection shall ensure that the micro-generator ceases to energize the distribution
network when any parameter exceeds the applied operating setting. Disconnection is required in case
of any hardware malfunctioning.
The micro-generator shall cease to energize the network in response to an interface protection
operation, this shall be achieved either by the separation of suitably rated mechanical contacts or by
the operation of a suitably rated solid state switching device. Where a solid state switching device is
used the micro-generator shall monitor the proper functioning of the device. In the event the solid state
switching device fails to interrupt the current, the micro-generator shall disconnect or cease to
energize. The solid state switching device shall be specified in accordance with the over-voltage
category of the micro-generator as specified by the manufacturer and the leakage current in the off-
state shall not be more than 0,1 mA regardless of the terminal voltage.
4.2.1.3 Accessibility of isolation switching devices
Under HD 384 series there is a requirement that means shall be provided to enable a generator set to
be isolated from the public supply. Where this means of isolation is not accessible for the DNO at all
times it is acceptable to provide two means of automatic disconnection, with a single control. At least
one of the means of disconnection must be afforded by the separation of mechanical contacts.
4.2.1.4 Place of the interface protection
The interface protection can either be incorporated within the micro-generator or afforded by separate
devices. In either case the interface protection shall meet the relevant requirements of EN 60255-6 or
equivalent and the manufacturer of the micro-generator shall declare that the combined devices fulfil
these requirements.
4.2.1.5 Changing settings of the interface protection
The interface protection settings may only be altered, from those in place at the time of
commissioning, with the written agreement of the DNO and then only in accordance with the
manufacturer instructions.
It shall not be permissible for the user to alter the interface protection settings.
NOTE Alteration of the settings of the interface protection may cause a breach of the type-certificate making re-testing
necessary unless the micro-generator is type-tested on the full setting range of the interface protection.

- 11 - EN 50438:2007
4.2.1.6 Combined protection device for multiple generators
It is allowed to use a protection device that affords interface protection for 2 or more micro-generators
up to and including 16 A per phase in aggregate. However the possibility to use Inform and Fit then
depends on the conditions of the type certificate of the protection device.
If two or more micro-generators, each with their own interface device, are placed in parallel, the proper
combined working of the protection devices shall be ensured.
In the case of adding a generator to the combined protection device the DNO shall be consulted.
4.2.2 Interface protection settings
National settings are listed in Annex A. If no national settings are provided for a particular country, the
default settings in Table 2 should be applied. The trip settings and clearance time in Table 2 and
Annex A are maximum range values. Other values may be applied, subject to any national
requirements given in Annex A. Settings should be as close as possible to the limits to avoid nuisance
tripping.
The measurement point can be inside the micro-generator or anywhere between the micro-generator
terminals and up to but not including the connection to the DNO network.
Table 2 – Default interface protection settings
Parameter Maximum Trip setting
clearance time
a
Over voltage – stage 1 See Annex A See Annex A
(if required)
Over voltage – stage 2 0,2 s 230 V + 15 %
Under voltage 1,5 s 230 V - 15 %
Over frequency 0,5 s 51 Hz
Under frequency 0,5 s 47 Hz
LoM (if required) See Annex A See Annex A
The stated currents and voltages are ‘true r.m.s.’-values.
The voltages in this table are
- phase-to-neutral in 230 V single phase systems and 230/400 V systems,
- phase-to-phase in a multiphase 230 V system.
a
Over voltage – stage 1: 10 min mean value corresponding to EN 50160.
Tolerances on trip values:
- voltage: ± 1 % of the nominal voltage;
- frequency: ± 0,5 % of the nominal frequency;
- clearance time: ± 10 %.
NOTE Voltage and frequency is referenced to the supply terminals.
4.2.3 Loss of Mains (LoM) protection
Where LoM protection is required (see Annex A) it shall use rate of change of frequency or vector shift
or any other method not precluded under the national requirements in Annex A. The trip setting shall
ensure cease energizing within the prescribed clearance time irrespective of where the LoM takes
place on the distribution network. This requirement is deemed to be satisfied by passing the test in
C.2.3.
A LoM protection shall not disturb other LoM protections.

4.2.4 Automatic reconnection after a network outage
The interface protection shall ensure that feeding power to the distribution network will only
commence, after the voltage and frequency on the distribution network have been within the limits of
the interface protection settings for a minimum of
• 3 min for mechanical AC generation,
• 20 s for inverter based systems.
In order to facilitate such automatic reconnection power input, the interface protection equipment and
sensing connections to the interface protection may be made on the DNO side of the disconnector
(but on the micro-generator side of the isolator) that is initiated by the interface micro-generator
protection.
4.2.5 Synchronisation
The operation of synchronising a micro-generator with the distribution network shall be fully automatic
i.e. it shall not be possible to manually close the switch between the two systems to carry out
synchronisation.
5 Power quality
5.1 Electromagnetic emission / immunity
The micro-generator shall comply with the requirements of the EMC Directive. As no product specific
EMC requirements are available in standards for micro-generators the generic EMC standards are
applicable, in particular EN 61000-6-1 on immunity and EN 61000-6-3 (including A11) on emission.
In these standards reference is made to the product family emission standards listed in Table 3 below.
Table 3 – Product family emission standards
Parameter Micro-generator rating Standard Requirement
Harmonics ≤ 16 A EN 61000-3-2 Class A
Voltage fluctuations and ≤ 16 A EN 61000-3-3 d = 3,3 % max.
c
flicker
NOTE The emission limits relate to the level of emissions from the micro-generator towards the distribution network.
5.2 DC injection
For inverter based systems only symmetrical control as defined in IEV 161-07-11 is permitted.
Systems which inject DC current by design (e.g. half wave operation) are not permitted.
NOTE  This requirement prohibits all systems which inject DC into the network by construction and will therefore lead to a
minimal impact on the network. This technical requirement can be fulfilled with reasonable effort for a broad range of
technologies.
5.3 Power factor
The power factor of the micro-generator at normal steady-state operating conditions across the
statutory tolerance band of nominal voltage shall be between 0,95 leading and 0,95 lagging, provided
the output active power of the micro-generator is above 20 % the rated output power of the unit.
NOTE Leading power factor is VARs absorbed by the micro-generator.

- 13 - EN 50438:2007
6 Operation and safety of the micro-generator
6.1 General
The micro-generator shall operate safely over the entire designed and declared operating range.
6.2 Safety
This standard does not cover the safety of DNO personnel or their contracted parties, as their safety is
a combination of electrical conditions and working instructions.
General requirements for safety of persons at work in or near and operation of electrical installations
are given in EN 50110, also national regulations can be applicable.
6.3 Information plate
The following information shall appear on the micro-generator information plate:
• manufacturer’s name or trade mark;
• type designation or identification number, or any other means of identification making it possible to
obtain relevant information from the manufacturer;
• rated power;
• nominal voltage;
• nominal frequency;
• phases;
• power factor.
This information must be provided on a plate on or in the micro-generator and in the documentation.
This information shall be copied in the users’ manual as well. In addition a serial number may be
added to the plate only.
This information could be part of the information plate of the entire micro-generator system.
All the information shall be given in the language and in accordance with the practice of the country in
which the micro-generator is intended to be installed.
6.4 Labelling
A warning notice shall be placed in such a position that any person gaining access to live parts will be
warned in advance of the need to isolate those live parts from all points of supply.
Special attention should be paid that the power supply, measuring circuits (sense lines) and other
parts may not be isolated from the network when the switch of the interface protection is open.
As a minimum, warning labels shall be placed:
• on the switchboard (DNO panel and consumer unit) that has the micro-generator connected to it;
• on all switchboards in between the consumer unit and the micro-generator itself;
• on, or in the micro-generator itself;
• at all points of isolation for the micro-generator.

All the information shall be given in the language and in accordance with the practice of the country in
which the micro-generator is intended to be installed.
Do not work on this equipment until it is
WARNING
isolated from both mains and on-site
dual supply
generation supplies
Isolate on-site generator at ________________________
Isolate mains supply at ___________________________

Figure 1 – Example of a warning label both for size and content
6.5 Maintenance and routine testing
The manufacturer shall provide a time frame for maintenance and/or routine testing.
The user is responsible for the proper maintenance and routine testing.
Maintenance and routine testing must be carried out by qualified service technicians.
7 Commissioning
7.1 General
4)
This standard provides for the installation of type-tested micro-generators.
The following conditions must be met for such an installation:
• the micro-generator (including the interface protection) shall fulfil the requirements of this standard
and the other applicable standards;
• the manufacturer shall provide an installation instruction in accordance with this standard and
national or regional requirements;
• access to the interface protection settings shall be tamper-proof;
• in the absence of product standards the micro-generator shall be type tested against the interface
requirements of this standard;
• the installation shall be carried out by installers with recognised and approved qualification related
to the fuels used, general electrical installations and a particular qualification relating to installation
of micro-generators.
NOTE  The installer / user should be aware that in addition to the DNO the energy supplier and or the metering authority will
need to be informed for contractual reasons.
———————
4)
An example of a type test certificate is given in Annex D.

- 15 - EN 50438:2007
In those countries where Inform and Fit is allowed without prior consent from the DNO, the DNO shall
be notified in accordance with the procedure described in 7.3. In all other countries prior consent of
the DNO is necessary.
7.2 Installation
The micro-generator shall be installed in accordance with all of the following requirements:
• this standard;
• HD 384 or the national implementation of it;
• national regulations;
• the manufacturer’s installation instructions.
7.3 Notification procedure
7.3.1 Inform and Fit for a single installation
The installation of a single micro-generator unit within a single customer’s installation can be
connected in parallel with the public distribution network without the prior permission of the local DNO.
The installer is to ensure that the local DNO is made aware of the micro-generator installation at or
before the time of commissioning. In addition the installer shall provide the DNO with information on
the installation, within 30 days of the micro-generator unit being commissioned, using a format similar
to that shown in B.1.
NOTE 1 The DNO and/or Energy Supplier and/or the metering authority might require contractual modifications of the existing
connection agreement with the customer following the installation of the micro-generator.
7.3.2 Multiple / planned installation
In the case of a planned installation project where the proposal is to install multiple micro-generator
units in a close geographic region it will be necessary for the installer to obtain the prior approval of
the local DNO. The DNO will need to assess the impact that these connections may have on the
Network and specify conditions for connection. The initial application will need to be in a format similar
to that shown in B.2. The confirmation of commissioning will need to be made within 30 days of
commissioning, using a format similar to that shown in B.1. Examples of these projects could be
– as part of a housing refurbishment programme in the same road / street, or
– as part of a new housing development.
The DNO may request the type-test information pro-forma when the application for connection pro-
forma is submitted if they do not have previous records. The installer shall supply a copy within
30 working days of the request.
7.4 Decommission arrangements
If the micro-generator is removed or decommissioned for any reason, the DNO must be informed. The
following requirements apply:
• the decommissioning shall be carried out by installers with recognised and approved qualification
relating to the fuels used, general electrical installations and a particular qualification relating to
installation of micro-generation;
• the property’s electrical wiring and fuel systems shall be reinstated to a safe condition;
• the notification of micro-generator decommissioning procedure is completed and a copy supplied
to the DNO within 5 working days of completion of the work;
• the notification can be carried out by using a similar format to the decommissioning form as shown
in B.3.
7.5 Replacement arrangements
If the micro-generator is replaced, the DNO must be informed, followed by commencement of
operation. This procedure can be carried out by completing the notification of micro-generator
decommissioning form and the notification of micro-generation installation form (see Annex B).
If during the lifetime of the micro-generator it is necessary to replace a major component, it is only
necessary to notify the DNO if the operating characteristics of the micro-generator or the interface
protection have been altered when compared against the unit that was originally commissioned.
On replacement the current standards and documents will apply.

- 17 - EN 50438:2007
Annex A
(normative)
Interface protection settings, national deviations
If no specific national settings for the Interface Protection are supplied in Annex A, the default settings
in 4.2.2, Table 2 are applicable.
AT – Austria
5)
The following national requirements are to be kept :
• technical and organizational rules for transmission and Distribution Supply Operators (TOR)
especially parts
D1:2004 “Netzrückwirkungsrelevante elektrische Betriebsmittel; Schwellwerte für die notwendige
Beurteilung durch den Netzbetreiber und festlegungen zur elektromagnetischen Verträglichkeit”
and
D4:2001 “Parallellbetrieb von Eigenerzeugungsanlagen”;
• market rules and the general conditions of network operators.
Both documents are published by the Austrian Energy Regulator - Energie-Control GmbH (ECG) - on
the website http://www.e-control.at.
Interface protection settings in compliance with ÖVE/ÖNORM E 2750 and TOR, in particular Part D4.
Parameter Maximum Maximum
clearance time trip setting
s
Over voltage 0,2 230 V + 11 %
Under voltage 0,2 230 V - 15 %
a
Over frequency 0,2 51 Hz
a
Under frequency 0,2 47 Hz
b b
LoM 5
NOTE Voltage and frequency are referred to the micro-generator.
a
This function has to operate at least in the range of maximum trip settings of voltage.
b
LoM protection and test procedures have to be conform with ÖVE/ÖNORM E 2750.

———————
5)
To be transposed in specific technical requirements instead of only references.

BE – Belgium
Settings must be in compliance with the technical legislation regulating the distribution networks. On
date of publication of this standard, the national settings were:
Option 1:
Parameter Trip setting
Maximum
clearance time
Over voltage Instant (max. 120 ms
...