EN 806-2:2005

Specification for installations inside buildings conveying water for human consumption - Part 2: Design

This document gives recommendations, and specifies requirements, on the design of potable water installations within buildings and for pipework outside buildings but within the premises (see EN 806-1) and applies to new installations, alterations and repairs.

Technische Regeln für Trinkwasser-Installationen - Teil 2: Planung

Dieses Dokument gibt Empfehlungen und beschreibt die Anforderungen an die Planung von Trinkwasser-Installationen innerhalb von Gebäuden und für Leitungsteile außerhalb von Gebäuden, aber innerhalb von Grundstücken (siehe EN 806-1) und ist anwendbar für Neuinstallationen, Umbau und Reparaturen.

Spécifications techniques relatives aux installations d'eau destinée à la consommation humaine à l'intérieur des bâtiments - Partie 2: Conception

La présente partie de la Norme européenne donne des recommandations et énonce les exigences concernant la conception des installations d'eau potable à l'intérieur des bâtiments, et dans certains cas, les canalisations à l'extérieur des bâtiments mais dans les limites de propriété (voir EN 806-1) ; et s'applique aux nouvelles installations, modifications et réparations.

Specifikacije za napeljave za pitno vodo v stavbah - 2. del: Načrtovanje

General Information

• Status: Published
• Publication Date: 15-Mar-2005
• Withdrawal Date: 29-Sep-2005
• ICS: 91.140.60 - Water supply systems
• Technical Committee: CEN/TC 164 - Water supply
• Drafting Committee: CEN/TC 164/WG 2 - Internal systems and components
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 21-Jun-2022
• Completion Date: 14-Apr-2025
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Directive: 93/38/EEC - Procurement procedures of entities operating in the water, energy, transport and telecommunications sectors
• Mandate: M/BC/CEN/88/15 - Standardization request to CEN/CENELEC in the field of Water supply, drainage and sewerage
• Ref Project: SIST EN 806-2:2005 - Specification for installations inside buildings conveying water for human consumption - Part 2: Design

Relations

• Revised: prEN 806-2 - Specification for installations inside buildings conveying water intended for human consumption - Part 2: Design
• Effective Date: 30-Aug-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2005
6SHFLILNDFLMH]DQDSHOMDYH]DSLWQRYRGRYVWDYEDKGHO1DþUWRYDQMH
Specification for installations inside buildings conveying water for human consumption -
Part 2: Design
Technische Regeln für Trinkwasser-Installationen - Teil 2: Planung
Spécifications techniques relatives aux installations d'eau destinée a la consommation
humaine a l'intérieur des bâtiments - Partie 2: Conception
Ta slovenski standard je istoveten z: EN 806-2:2005
ICS:
13.060.20 Pitna voda Drinking water
91.140.60 Sistemi za oskrbo z vodo Water supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 806-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2005
ICS 91.140.60
English version
Specification for installations inside buildings conveying water
for human consumption - Part 2: Design
Spécifications techniques relatives aux installations pour Technische Regeln für Trinkwasser-Installationen - Teil 2:
l'eau destinée à la consommation humaine à l'intérieur des Planung
bâtiments - Partie 2: Conception
This European Standard was approved by CEN on 3 February 2005.
CEN 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 CEN 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 CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 806-2:2005: E
worldwide for CEN national Members.

Contents
Foreword.3
1 Scope .4
2 Normative references .4
3 General requirements.7
4 Private water supplies.9
5 Acceptable materials.10
6 Components.14
7 Pipework inside buildings .14
8 Cold potable water services .15
9 Hot water systems .17
10 Prevention of bursting .18
11 Guidelines for water meter installations .21
12 Water conditioning .22
13 Acoustics.23
14 Protection of systems against temperatures external to pipes, fittings and appliances.23
15 Boosting .25
16 Pressure reducing valves .30
17 Combined drinking water and fire fighting services.31
18 Prevention of corrosion damage.32
19 Additional requirements for vented cold and hot water systems .33
Annex A (informative)  List of acceptable materials (non-exhaustive).39
Annex B (informative)  Aspects for water conditioning .42
Bibliography .49

Foreword
This document (EN 806-2:2005) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the
secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by September 2005, and conflicting national standards shall be withdrawn at the
latest by September 2005.
This document has been prepared under the direction of CEN/TC 164 and is intended for the use of engineers,
architects, surveyors, contractors, installers, water suppliers, consumers and regulatory inspections.
This standard has been written in the form of a practice specification. It is the second part of a European Standard
consisting of five parts as follows:
 Part 1: General
 Part 2: Design
 Part 3: Pipe sizing
 Part 4: Installation
 Part 5: Operation and maintenance
NOTE : Products intended for use in water supply systems must comply, when existing, with national regulations and testing
arrangements that ensure fitness for contact with drinking water. The Member states relevant regulators and the EC
Commission agreed on the principle of a future unique European Acceptance Scheme (EAS), which would provide a common
testing and approval arrangement at European level. If and when the EAS is adopted, European Product Standards will be
amended by the addition of an Annex Z/EAS under Mandate M136 which will contain formal references to the testing,
certification and product marking requirements of the EAS. Until EAS comes into force, the current national regulations remain
applicable.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,
Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
1 Scope
This document gives recommendations, and specifies requirements, on the design of potable water installations
within buildings and for pipework outside buildings but within the premises (see EN 806-1) and applies to new
installations, alterations and repairs.
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 26, Gas-fired instantaneous water heaters for sanitary uses production, fitted with atmospheric burners
(Including Corrigendum 1998).
EN 89, Gas-fired storage water heaters for the production of domestic hot water.
EN 545, Ductile iron, pipes, fittings, accessories and their joints for water pipelines — Requirements and test
methods.
EN 625, Gas-fired central heating boilers — Specific requirements for the domestic hot water operation of
combination boilers of nominal heat input not exceeding 70 kW .
EN 805, Water supply — Requirements for external systems and components outside buildings.
EN 806-1:2000, Specifications for installations inside buildings conveying water for human consumption —
Part 1: General.
prEN 806-3, Specifications for installations inside buildings conveying water for human consumption — Part 3: Pipe
sizing.
EN 973, Chemicals used for treatment of water intended for human consumption – Sodium chloride for
regeneration of ion exchangers.
EN 1057, Copper and copper alloys – Seamless, round copper tubes for water and gas in sanitary and heating
applications.
EN 1254-1, Copper and copper alloys – Plumbing fittings – Part 1: Fittings with ends for capillary soldering or
capillary brazing to copper tubes.
EN 1254-2, Copper and copper alloys – Plumbing fittings – Part 2: Fittings with compression ends for use with
copper tubes.
EN 1254-3, Copper and copper alloys – Plumbing fittings – Part 3: Fittings with compression ends for use with
plastics pipes.
EN 1254-4, Copper and copper alloys - Plumbing fittings - Part 4: Fittings combining other end connections with
capillary or compression ends
EN 1254-5, Copper and copper alloys – Plumbing fittings – Part 5: Fittings with short ends for capillary brazing to
copper tubes.
prEN 1254-7, Copper and copper alloys - Plumbing fittings - Part 7: Fittings with press ends for metallic tubes
EN 1452-1, Plastics piping systems for water supply — Unplasticized poly(vinyl chloride) (PVC-U) —
Part 1: General.
EN 1452-2, Plastics piping systems for water supply — Unplasticized poly(vinyl chloride) (PVC-U) — Part 2: Pipes.
EN 1452-3, Plastics piping systems for water supply — Unplasticized poly(vinyl chloride) (PVC-U) —
Part 3 : Fittings.
EN 1452-5, Plastics piping systems for water supply — Unplasticized poly(vinyl chloride) (PVC-U) — Part 5:
Fitness for purpose of the system.
ENV 1452-7, Plastics piping systems for water supply — Unplasticized poly(vinyl chloride) (PVC-U) –
Part 7: Guidance for the assessment of conformity.
EN 1487, Building valves – Hydraulic safety groups –Tests and requirements.
EN 1488, Building valves – Expansion group – Tests and requirements.
EN 1489, Building valves – Pressure safety valves – Tests and requirements.
EN 1490, Building valves - Combined temperature and pressure relief valves - Tests and requirements.
EN 1491, Building valves – Expansion valve – Tests and requirements.
EN 1717, Protection against pollution of potable water in water installations and general requirements of devices to
prevent pollution by backflow.
EN 10226-1, Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and
parallel internal threads - Dimensions, tolerances and designation.
EN 10240, Internal and/or external protective coatings for steel tubes – Specification for hot dip galvanized
coatings applied in automatic plants.
EN 10242, Threaded pipe fitting in malleable cast iron.
EN 10255, Non-Alloy steel tubes suitable for welding and threading – Technical delivery conditions.
EN 10284, Malleable cast iron fittings with compression ends for polyethylene (PE) piping systems.
EN 12201-1, Plastics piping systems for water supply – Polyethylene (PE) – Part 1: General
EN 12201-2, Plastics piping systems for water supply – Polyethylene (PE) – Part 2: Pipes
EN 12201-3, Plastics piping systems for water supply – Polyethylene (PE) – Part 3: Fittings.
EN 12201-5, Plastics piping systems for water supply – Polyethylene (PE) – Part 5: Fitness for purpose of the
system.
CEN/TS 12201-7, Plastics piping systems for water supply – Polyethylene (PE) – Part 7: Guidance for the
assessment of conformity.
EN 12502-1, Protection of metallic materials against corrosion – Guidance on the assessment of corrosion
likelihood in water distribution and storage systems – Part 1: General.
EN 12502-2, Protection of metallic materials against corrosion – Guidance on the assessment of corrosion
likelihood in water distribution and storage systems – Part 2: Influencing factors for copper and copper alloys.
EN 12502-3, Protection of metallic materials against corrosion – Guidance on the assessment of corrosion
likelihood in water distribution and storage systems – Part 3: Influencing factors for hot dip galvanised ferrous
materials.
prEN 12502-4, Protection of metallic materials against corrosion – Guidance on the assessment of corrosion
likelihood in water distribution and storage conveying systems – Part 4: Influencing factors for stainless steels.
EN 12502-5, Protection of metallic materials against corrosion – Guidance on the assessment of corrosion
likelihood in water distribution and storage systems – Part 5: Influencing factors for cast iron, unalloyed and low
alloyed steels.
EN 12842, Ductile iron fittings for PVC-U or PE piping systems – Requirements and test methods.
EN 13443-1, Water conditioning equipment inside buildings - Mechanical filters - Part 1: Particle rating 80 µm to
150 µm - Requirements for performances, safety and testing.
EN 14095, Water conditioning equipment inside buildings - Electrolytic treatment systems with aluminium anodes -
Requirements for performance, safety and testing.
EN 14525, Ductile iron wide tolerance couplings and flange adaptors for use with pipes of different materials: dutile
iron, Grey iron, Steel, PVC-U PE, Fibre – cement.
prEN 14743, Water equipment inside buildings - Softeners - Requirements for performance, safety and testing.
EN 29453, Soft solder alloys; chemical compositions and forms (ISO 9453:1990).
EN 60335-2-21, Household and similar electrical appliances - Safety - Part 2-21: Particular requirements for
storage water heaters (IEC 60335-2-21:2002, modified).
EN 60335-2-35, Household and similar electrical appliances -Safety - Part 2-35: Particular requirements for
instantaneous water heaters (IEC 60335-2-35:2002).
EN 60534-8-4, Industrial-process control valves — Part 8 : Noise considerations — Section 4: Prediction of noise
generated by hydrodynamic flow (IEC 60534-8-4/1994).
EN 60730-1, Automatic electrical controls for household and similar use — Part 1: General requirements (IEC
60730-1:1999, modified).
EN 60730-2-8, Automatic electrical controls for household and similar use — Part 2-8: Particular requirements for
electrically operated water valves, including mechanical requirements (IEC 60730-2-8:2000, modified).
EN ISO 3822-1, Acoustics - Laboratory tests on noise emission from appliances and equipment used in water
supply installations - Part 1: Method of measurement (ISO 3822-1:1999).
EN ISO 3822-2, Acoustics - Laboratory tests on noise emission from appliances and equipment used in water
supply installations - Part 2: Mounting and operating conditions for draw-off taps and mixing valves (ISO 3822-
2:1995).
EN ISO 3822-3, Acoustics - Laboratory tests on noise emission from appliances and equipment used in water
supply installations - Part 3: Mounting and operating conditions for in-line valves and appliances (ISO 3822-
3:1997).
EN ISO 3822-4, Acoustics - Laboratory tests on noise emission from appliances and equipment used in water
supply installations - Part 4: Mounting and operating conditions for special appliances (ISO 3822-4:1997).
EN ISO 6509, Corrosion of metals and alloys - Determination of dezincification resistance of brass (ISO
6509:1981).
EN ISO 15874-1, Plastics piping systems for hot and cold water installations – Polypropylene (PP) – Part 1:
General (ISO 15874-1:2003).
EN ISO 15874-2, Plastics piping systems for hot and cold water installations – Polypropylene (PP) – Part 2: Pipes
(ISO 15874-2:2003).
EN ISO 15874-3, Plastics piping systems for hot and cold water installations – Polypropylene (PP) – Part 3:
Fittings (ISO 15874-3:2003).
EN ISO 15874-5, Plastics piping systems for hot and cold water installations – Polypropylene (PP) – Part 5:
Fitness for purpose of the system (ISO 15874-5:2003).
EN ISO/TS 15874-7, Plastics piping systems for hot and cold water installations– Polypropylene (PP) – Part 7:
Guidance for the assessment of conformity (ISO/TS 15874-7:2003).
EN ISO 15875-1, Plastics piping systems for hot and cold water installations – Crosslinked polyethylene (PE-X) –
Part 1: General (ISO 15875-1:2003).
EN ISO 15875-3, Plastics piping systems for hot and cold water installations – Crosslinked polyethylene (PE-X) –
Part 3: Fittings (ISO 15875-3:2003).
EN ISO 15875-5, Plastics piping systems for hot and cold water installations – Crosslinked polyethylene (PE-X) –
Part 5: Fitness for purpose of the system (ISO 15875-5:2003).
EN ISO/TS 15875-7, Plastics piping systems for hot and cold water installations– Crosslinked polyethylene (PE-X)
– Part 7: Guidance for the assessment of conformity (ISO/TS 15875-7:2003)
EN ISO 15876-1, Plastics piping systems for hot and cold water – Polybutylene (PB) – Part 1: General (ISO 15876-
1:2003).
EN ISO 15876-2, Plastics piping systems for hot and cold water installations – Polybutylene (PB) – Part 2: Pipes
(ISO 15876-2:2003).
EN ISO 15876-3, Plastics piping systems for hot and cold water installations – Polybutylene (PB) – Part 3: Fittings
(ISO 15876-3:2003).
EN ISO 15876-5, Plastics piping systems for hot and cold water installations – Polybutylene (PB) – Part 5: Fitness
for purpose of the system (ISO 15876-5:2003).
EN ISO/TS 15876-7, Plastics piping systems for hot and cold water installations – Polybutylene (PB) – Part 7:
Guidance for the assessment of conformity (ISO/TS 15876-7:2003).
EN ISO 15877-1, Plastics piping systems for hot and cold water installations – Chlorinated poly(vinyl chloride)
(PVC-C) – Part 1: General (ISO 15877-1:2003).
EN ISO 15877-2, Plastics piping systems for hot and cold water installations – Chlorinated poly(vinyl chloride)
(PVC-C) – Part 2: Pipes (ISO 15877-2:2003).
EN ISO 15877-3, Plastics piping systems for hot and cold water installations – Chlorinated poly(vinyl chloride)
(PVC-C) – Part 3: Fittings (ISO 15877-3:2003).
EN ISO 15877-5, Plastics piping systems for hot and cold water installations – Chlorinated poly(vinyl chloride)
(PVC-C) – Part 5: Fitness for purpose of the system (ISO 15877-5:2003).
EN ISO/TS 15877-7, Plastics piping systems for hot and cold water installations – Chlorinated poly(vinyl chloride)
(PVC-C) – Part 7: Guidance for the assessment of conformity (ISO/TS 15877-7:2003).
ISO 15875-2, Plastics piping systems for hot and cold water installations – Crosslinked polyethylene (PE-X) – Part
2: Pipes.
IEC 60064-5-54, Electrical installations of buildings - Part 5-54: Selection and erection of electrical equipment;
Earthing arrangements, protective conductors and protective bonding conductors
3 General requirements
3.1 Water supply
This document applies irrespective of the water being supplied by a statutory water supplier or from a private
supply. Attention is drawn to national or local regulations and requirements.
3.2 Basic concepts
3.2.1 General
For design and construction of a potable water installation two types of installation are considered:
 installation type A: Closed potable water installations, see EN 806-1:2000, 5. and Annex A, Figure 2.
 installation type B: Vented potable water installations, see EN 806-1:2000, 5.11 and Annex A, Figure 3.
Installation types A and B may be combined.
The potable water installation shall be designed to:
a) avoid waste, undue consumption, misuse and water contamination;
b) avoid excessive velocity, low flow rates and stagnant areas;
c) enable water supply to all individual water outlets, taking into consideration pressure, flow rate, water
temperature and use of building;
d) avoid the trapping of air during filling and the formation of air locks during operation of the installation;
e) not cause danger or inconvenience to persons and domestic animals nor endanger buildings or their contents;
f) avoid damage (e.g. scaling, corrosion and degradation ) and to prevent the water quality being affected by local
environment;
g) facilitate access and maintenance operations of appliances;
h) avoid cross-connections and
i) minimise the generation of noise.
3.2.2 Water and energy conservation
The designer shall consider the water usage and energy demands of an installation and seek to minimise these.
3.3 Underground pipework
All underground pipework covered by this standard shall conform with the requirements given in EN 805.
3.4 Materials, components and appliances
3.4.1 General
All materials, components and appliances used in the construction of potable water systems shall comply with
appropriate CEN product standards or European Technical Approval guidelines if applicable. Where these are not
available national standards or local regulations should be used.
The design and selection of materials shall take into consideration the service conditions and water quality.
Information and criteria about the reasonable choice of metal pipe material taking into account corrosion likelihood is
given in EN 12502-1 to –5.
3.4.2 Pressure and temperature
To ensure adequate strength, all components of the system shall be designed to meet the test pressure requirements
of the local and national laws and regulations. The test pressure shall be at least 1,5 times the allowable maximum
operating pressure (PMA).
All pipes and joints of a potable water installation shall be designed for a service life of 50 years taking into account
appropriate maintenance and specific operating conditions.
Unless otherwise specified in European Standards, the materials, components and appliances for hot drinking water
installations shall be capable of resisting water temperatures up to 95° under fault conditions.
The minimum operating conditions for calculation purposes for pipes and pipe fittings shall be as given in Table 1 and
Table 2.
Table 1 — Allowable maximum operating pressure classes
Allowable maximum operating pressure Pressure
(PMA) class
kPa
PMA  1,0 1000
PMA  0,6 600
PMA  0,25 250
Table 2 — Classification of service conditions for plastic pipe systems
Application Design Time T Time T Time at T Typical field of
max mal mal
class temperature, at T at T for fault for fault application
D max
T  condition condition
D
°C years °C years °C h
1 60 49 80 1 95 100 Hot water supply
(60 °C)
2 70 49 80 1 95 100 Hot water supply
(70 °C)
All systems which satisfy the conditions specified in Table 2 shall also be suitable for the conveyance of cold water
for a period of 50 years at a temperature of 20 °C and a design pressure of 10 bar.
If not required in national or local regulations the sum of operation pressure and surge pressure should not exceed
test pressure of the installation.
Surge pressures resulting from the operation of valves in fire extinguishing and fire protection systems which are
operated no more than once a month for test purposes and otherwise only in the event of a fire are excluded from this
requirement.
3.5 Water flow rates
Design flow rates from outlets are given in prEN 806-3.
3.6 Operating Temperature
30 s after fully opening a draw-off fitting, the water temperature should not exceed 25 °C for cold water draw off points
and should not be less than 60 °C for central hot water systems unless otherwise specified by local or national
regulations.
Hot water systems should have the facility to enable the temperature at the extremities of the system to be raised to
70 °C for disinfection purposes (see 9.1).
4 Private water supplies
Where a private water supply is to be used in addition to water supplied by a statutory water supplier, the supplier's
approval to the proposals shall be obtained before work commences. There shall be no cross connection of systems
carrying water from different water suppliers or of different sources from one supplier. See EN 1717.
5 Acceptable materials
5.1 Choice of material
The following factors shall be taken into account in selecting materials used in a water system:
a) effect on water quality;
b) vibrations, stresses or settlement;
c) internal water pressure;
d) internal and external temperatures;
e) internal and external corrosion;
f) compatibility of different materials;
g) ageing, fatigue, durability and other mechanical factors;
h) permeation.
Lead pipes and -fittings shall not be used.
A non-exhaustive list of acceptable materials is given in Annex A.
NOTE In the framework of the EU-Mandate M136 under the Construction Products Directive (CPD) and the Drinking Water
Directive (DWD) a system of European Standards (EN) and other regulation is in preparation to establish a European
Acceptance Scheme (EAS) for testing and certification of products in contact with water intended for human consumption.
5.2 Pipe joints
All joints used for potable water shall conform to the relevant standards.
Pipe joints shall be permanently water-tight under the alternating stresses occurring in operation.
Basically two different designs will be distinguished: pipe joints which can take up axial forces and such which need
a fixation to prevent disconnection. For the latter, suitable fixing points shall be provided to absorb hydraulic forces
acting on the joints.
5.3 Materials used in pipe joint assemblies
Only solders free from lead, antimony and cadmium shall be specified, unless permitted by national or local
regulations.
Other materials and systems can be used if they comply with the general requirements given in 3.4.1.
Table 3 — Material for pipes and fittings, metals
Material for pipes
Available jointing methods for Ductile iron Stainless steel Hot dip galvanized steel (HDGS) Copper
metallic piping systems
Material for fittings
Ductile iron Stainless steel and brass Hot dip galvanized malleable cast iron Copper and copper alloys
Capilliary solder fitting - - - X
soldering
d d c
Brazing -
X X X
Welding - d - c
X X
a - b X c
Threaded joint X X
Compression fittings - X X X
Crimped fittings - X - X
Sockets with elastomeric X - - -
sealing ring and spigot ends
Push fit fittings X X X X
Flanges X X X X
Demountable unions X X X X
Further commentaries
Pipes and fittings according to EN Pipes and fittings. Small copper Pipes in HDGS according to EN 10255 only medium or he- Pipes, fittings, pre-fabricated assemblies. Solders shall
545. Protective coatings and linings connections to large stainless steel avy series with hot dip galvanized coating according to EN be tin copper alloy (No 23,24) or tin silver (No 28,29) in
may be required. Sockets with spigot tanks should be avoided. Fluxes 10240 only coating quality A.1. Hot dip galvanized accordance with EN 29453. Pipes see EN 1057.
ends according to EN 545. containing chlorides, borides and malleable cast iron fittings according to EN 10242. Copper and copper alloy capillary fittings for soldering
other substances that can cause Galvanized malleable cast iron fittings are normally used and brazing, see EN 1254-1 and EN 1254-5. Copper
pitting of stainless steel shall not be for jointing. Site formed bends shall not be used to avoid alloy compression fittings, see EN 1254-2. For push fit
used - phosphoric acid based fluxes damage to galvanizing, hot dip galvanized bends according fittings see prEN 1254-7. For threaded ends see EN
shall be used. to EN 10242 shall be used instead 1254-4.
a
Thread according to EN 10226-1
b
Thread on transition fittings
c
See national regulations and standards

d
Corrosion risks have to be considered, see also national regulations and standards
X permissible
-  not permissible
Table 4 — Material for pipes and fittings, plastics (PE-X, PE, PVC-U)

Material for pipes
PE-X PE PVC-U
Available jointing methods for
plastics piping systems
Material for fittings
Plastic Metallic Ductile iron Malleable cast iron Copper alloys POM PP PE Ductile iron PVC-U
c
fittings fittings
Welding (electro fusion, butt - - - - - - - X - -
fusion, ….)
Solvent cemented joints - - - - - - - - - X
a b b b b b b b b b
Threaded joint -
X X X X X X X X X
Compression fittings X X X X X X X - X X
Crimped fittings X X - - - - - - - -
Sockets with elastomeric sealing - - X X - - - - X X
ring and spigot ends
Push fit fittings X X - - - - - - - -
Flanges X X X X X - X X X X
Demountable unions X X - X X - - X X X
Further statements
Pipes, fittings and Only joints with fitness Only joints with fitness Only joints with Only joints with Pipes, fittings and Socket fittings Pipes, fittings and pipe
pipe joints according for purpose of the PE- for purpose of the PE- fitness for purpose fitness for purpose pipe joints according to joints according to
to EN ISO 15875- piping system piping system of the PE-piping of the PE-piping according to EN 12842, EN 1452-1, EN 1452-2,
1,ISO 15875-2 and according to EN 12201- according to EN system according to system according to EN 12201-1, EN 14525 EN 1452-3 in
EN ISO 15875-3 in 5; fittings with 12201-5; compression EN 12201-5; EN 12201-5. EN 12201-2, conjunction with
conjunction with compression or socket fittings in accordance compression fittings EN 12201-3 in EN 1452-5 and
EN ISO 15875-5 and ends in accordance with EN 10284. in accordance with conjunction with ENV 1452-7.
EN ISO/TS 15875-7. with EN 12842. EN 1254-3. EN 12201-5 and
CEN/TS 12201-7.
EN 14525
a
Thread according to EN 10226-1

b
Thread on transition fittings
c   Compatibility between pipe material and metallic material shall be demonstrated by the supplier.
X   permissible
-   not permissible
Table 5 – Material for pipes and fittings, plastics (PVC-C, PP, PB)
Material for pipes
PVC-C PP PB
Available jointing methods for
plastics piping systems Material for fittings
c c
Stainless steel Copper alloys PVC-C Plastic fittings Metallic fittings PP Plastic fittings Metallic fittings PB
other than PP other than PB
Welding - - - - - X - - X
Solvent cemented joints - - X - - - - - -

a b b - b b b b b b
X X X X X X X
Threaded joint X
Compression fittings X X - X X X X X X
Crimped fittings - - - - - - X X -
Sockets with elastomeric sealing - - - - - - - - -
ring and spigot ends
Push fit fittings - - - X X - X X X
Flanges X X X X X X X X X
Demountable unions X X X X X X X X X
Further Commentaries
Pipes, fittings and pipe joints according to Pipes, fittings and pipe joints according to Pipes, fittings and pipe joints according to EN ISO
EN ISO 15877-1, EN ISO 15877-2 and EN ISO EN ISO 15874-1, EN ISO 15874-2 and 15876-1, EN ISO 15876-2 and EN ISO 15876-3 in
15877-3 in conjunction with EN ISO 15877-5 and EN ISO 15874-3 in conjunction with EN ISO 15874-5 conjunction with EN ISO 15876-5 and EN ISO/TS
EN ISO/TS 12731-7. and EN ISO/TS15874-7. 15876-7

a
Thread according to EN 10226-1

b
Thread on transition fittings
c   Compatibility between pipe material and metallic material shall be demonstrated by the supplier.
X  permissible
-   not permissible
6 Components
6.1 Stop valves
It is recommended that only stop valves that do not unduly obstruct the flow should be installed in pipes (e. g.
spherical valves, gate valves).
6.2 Expansion joints
Metal bellows expansion joints shall be designed to withstand the maximum service condition and for not less than
10 000 full axial strokes (expansion/contraction). Proof of compliance with this requirement shall be provided by the
manufacturer. The applicable test method should be agreed between the manufacturer and the customer.
The use of elastomeric expansion joints in a potable water system is only permitted if they have been suitably
approved implying their adequacy of design and material. Elastomeric expansion joints shall have a minimum lifetime
of 10 years when fitted according to manufacturers instructions.
6.3 Hoses
Flexible hoses may be used to compensate for displacement and angular deflections which occur under given service
conditions for which they are designed.
All hoses used instead of pipes and which are permanently under pressure shall comply with 3.4.1.
A servicing valve shall be installed immediately upstream of every hose connection to an appliance.
Hoses should not be longer than 2,0 m.
7 Pipework inside buildings
7.1 Isolation
Supply and distributing pipes shall be capable of being isolated and drained.
In every building or part of a building to which a separately chargeable supply of water is provided and in all premises
occupied as a dwelling, whether or not separately charged for a supply of water, a stop valve shall be provided that
controls the whole of the supply to the premises concerned without shutting off the supply to any other premises. This
stop valve shall, so far as is practicable, be installed within the building or premises concerned in an accessible
position above floor level and close to the point of entry of the pipe supplying water to that premises, whether this be a
supply pipe or a distributing pipe.
The supply pipes for each storey and those in the individual flats shall be capable of being shut off separately.
A servicing valve shall be provided on the inlet connection to appliances e.g. WC-cistern, storage cisterns, water
heaters, washing machines.
In addition, where a common supply or distributing pipe provides water to two or more premises, it shall be fitted
with a stop valve that controls the water supply to all of the premises supplied by that pipe. This stop valve shall be
installed either inside or outside the building in a position to which every occupier of the premises supplied has
access.
7.2 Positioning
A stop valve shall be installed in every pipe supplying water to any structure erected within the cartilage of a building
but having no access from the main building. This stop valve shall be located in the main building as near as
practicable to the exit point of the supply pipe to the other structure or if this is not practicable in the other structure
itself as near as possible to the point of entry of the supply.
Hot water taps shall be on the left, cold water taps on the right.
In a dwelling divided into a number of flats, where the risers are centrally located, the stop valves shall be installed in
a room near the riser or space to which access is possible.
Where a supply provides water to more than one building a riser shall be installed in each building.
In the case where less frequent use is made of the draw off capacity, such as in the case of single family houses or
similar dwellings, there need only be a stop valve and, where required, a drain facility on the incoming supply.
Where pipes for hot and cold potable water are arranged one above another, the hot water pipe shall be located
above the cold water pipe.
Except where a pipe is installed in a sleeve, duct or chase, no pipework shall be embedded in any wall or solid floor or
installed in or below a ground floor unless it can be readily removed and replaced, unless allowed by national or local
regulations or standards.
Pipes shall not be installed in the following types of shafts still used for their original purpose, e.g.
 in smoke shafts;
 in ventilation shafts;
 in elevator shafts;
 in domestic garbage shafts;
Pipes shall not be laid through drains or sewers.
Fire protection has to be maintained.
7.3 Surface mounting
Where practicable all supply and distributing pipes should be surface mounted. Pipework may be boxed in.
7.4 Backflow protection
The design and manner installation of components e.g. sanitary taps with hoses and cold water appliances shall
comply with the backflow protection requirements of EN 1717 (e.g. vending machines).
8 Cold potable water services
8.1 Potable water taps
No potable water point shall be installed at the end of a long pipe from which only small volumes of water are drawn
or water is drawn infrequently.
Pipe runs to cold water taps within buildings shall not follow the routes of space heating or hot water pipes or pass
through heated areas such as airing cupboards or, where local proximity is unavoidable, the hot and cold pipes shall
be insulated from each other.
A potable water tap shall be provided at the kitchen sink in every dwelling (see EU-Directive 98/83).
8.2 Differentiation and identification of pipes and components
Taps shall be identified. If colour code is used for this purpose, red shall identify hot and blue shall identify cold water.
In the case of two or more water systems (potable and non-potable water) and in accordance with national or local
regulations pipework, cisterns, valves etc of the potable and the non-potable water system shall be adequately and
permanently marked e.g. with the appropriate colour banding to facilitate identification and to avoid operating errors.
Draw-off points for non-potable water shall be identified with the words "Non-potable water" or by a prohibition sign as
shown in figure 1. If the majority of draw-off points on industrial premises are for non-potable water, the draw-off
points for potable water may be identified by the words "Potable water" or by the "Potable water" symbol specified in
Figure 1, provided that notices are posted to draw attention to this deviation from normal practice.

Figure 1 — Symbol "Potable water" and prohibition sign "Non-potable water"
8.3 Supply and distributing pipes
No pipe shall be secured to another pipe e.g. gas pipe, or used as a support for other pipes.
A servicing valve shall be fitted upstream of, and as close as practicable to, every float-operated valve.
Draining taps should be fixed over a drain or have provision for discharging the water to the nearest convenient point
for disposal.
Water outlets shall only be placed in positions where there is a drainage system of sufficient capacity, or where the
water in other ways can be drained off or collected in an appropriate way.
8.4 Electrical isolators
Where national or local regulations require electrical isolators for buried metal service pipes, an isolator shall be
installed near the supply stop valve in the building, care being taken to ensure that this isolator cannot be bridged
accidentally.
Buried metal service pipes that service a number of buildings shall be fitted with isolators both before leaving one
building and after entering another. The pipework within each building shall be connected to potential equalizing
bars. Special measures (e.g. protective insulation) shall be taken if electrical actuators are installed in such pipes
(see Figure 2 for example).
Key
(1) Water isolator
(2) Potential equalizing bar IEC 60064-5-54
(3) Buried metal supply pipe
1 Building 1
2 Building 2
3 Building 3
Figure 2 — Example of the arrangement of electrical isolators in metal pipes
8.5 Additional requirements for vented cold water systems (Installation Type B)
See 19.1.
9 Hot water systems
9.1 General
Hot potable water installations consist of a water heater, the equipment necessary for the safe operation of the
system, heating equipment and the associated pipework with valves and fittings.
The hot water system shall comply with EN 1487, EN 1488, EN 1489, EN 1490 and EN 1491.
In respect to the prevention of growth of legionella bacteria national or local regulations shall apply.
The hot potable water installation shall not be used for space heating purposes except for towel rails, where
national regulations permit this practice.
9.2 Components
9.2.1 General
To ensure adequate strength to all parts of the system, components shall be rated to allowable maximum operating
pressure class (PMA) (see Table 1). The difference in temperature between flow and return connections on the
water heater shall be equal or less than 5 K.
9.2.2 Cold feed pipe
Shall discharge near the bottom of the heater or storage vessel or vessels.
A service valve shall be provided in a convenient and accessible position in every cold feed pipe. In cistern fed
installations this valve shall be fitted close to the feed cistern.
9.3 Taps and mixing valves
9.3.1 General
When using mechanical (non-thermostatic) mixing valves scalding can occur if water from a different source fails or
the cold water pressure is reduced therefore mixing valves and single outlet combination taps should be supplied
with hot and cold water from the same source, e.g. storage cistern or mains. Non-thermostatically controlled mixing
valves shall not be used to control the water to more that one outlet simultaneously.
9.3.2 Scalding prevention
Hot drinking water installations shall be installed so that the risk of scalding is minimized.
At outlets where particular attention is required for the control of temperature such as hospitals, schools, elderly
people's homes etc., the installation of thermostatic mixing valves with maximum temperature limiting devices
should be considered to minimize the risk of scalding. Recommended maximum temperature is 43 °C.
At shower installations etc. in kindergartens and certain sections of nursing homes care should be taken to ensure
that the temperature cannot exceed 38 °C.
9.4 Surface temperatures
When there are no national or local regulations pipes and storage vessels shall be insulated to promote maximum
economy of fuel and water, and where accidental contact is possible, the temperature of exposed surfaces of
storage vessels, pipes and ancillary fittings should not exceed the value for the specific application (e.g.
kindergarten, old peoples homes etc.)
9.5 Connections between cold and hot water pipes
Check valves shall be fitted to hot and cold feed pipe connections where a common shut off device is incorporated
in the outlet nozzle. Protection against cross flow shall be in accordance
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