CEN/TR 17426:2019

SLOVENSKI STANDARD
01-december-2019
Sanitarne naprave - Sistemi za odvajanje odpadne vode iz sanitarnih naprav
Sanitary appliances - Drainage systems for the application of sanitary appliances
Sanitärausstattungsgegenstände - Entwässerungssysteme für den Einsatz von
Sanitärausstattungsgegenstände
Appareils sanitaires - Systèmes de drainage pour l'application des appareils sanitaires
Ta slovenski standard je istoveten z: CEN/TR 17426:2019
ICS:
91.140.70 Sanitarne naprave Sanitary installations
91.140.80 Drenažni sistemi Drainage systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TR 17426
TECHNICAL REPORT
RAPPORT TECHNIQUE
October 2019
TECHNISCHER BERICHT
ICS 91.140.70; 91.140.80
English Version
Sanitary appliances - Drainage systems for the application
of sanitary appliances
Appareils sanitaires - Systèmes d'évacuation pour Sanitärausstattungsgegenstände -
l'application des appareils sanitaires Entwässerungssysteme für den Einsatz von
Sanitärausstattungsgegenstände

This Technical Report was approved by CEN on 16 September 2019. It has been drawn up by the Technical Committee CEN/TC
163.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 17426:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Drinking water installation . 5
5 The drainage system . 6
5.1 Types of sewage water: black water and rain water . 6
5.2 Types of building drainage system: separate sewerage system and combined
sewerage system . 6
5.3 Drainage system: design and dimensioning . 6
5.4 Basis for drainage systems . 7
6 Types of drainage systems . 7
6.1 General . 7
6.2 System I: Single discharge stack system with partly filled branch discharge pipes . 7
6.3 System II: Single discharge stack system with small bore discharge branch pipes . 7
6.4 System III: Single discharge stack system with full bore branch discharge pipes . 7
6.5 System IV: Separate discharge stack system . 7
6.6 Area of application. 7
7 Sanitary appliance . 8
8 Product standards . 8
8.1 General . 8
8.2 EN 997 — WCs . 8
8.3 EN 13407 — urinals . 10
8.4 EN 14688 — Wash basins and EN 14528 — Bidets . 12
8.5 Shower trays — EN 14527 . 13
8.6 Characteristics of any other sanitary appliances according the drainage system . 13
9 Summary . 13
Annex A (informative) Use of drainage systems in Europe . 14
Annex B (informative) Special national rules . 17
Annex C (informative) National product information point . 19
European foreword
This document (CEN/TR 17426:2019) has been prepared by Technical Committee CEN/TC 163
“Sanitary appliances”, the secretariat of which is held by UNI.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Introduction
Sewerage disposal is a very important task of building services engineering because of hygienic reasons.
The piping must drain waste water and rain water out of the building and lead it way from the building
safe. Blockages must be avoided by proper design of the drainage system as well as the use of the
appropriate selection of the sanitary appliances.
On one hand, harmonized European standards exist for a lot of sanitary appliances to be installed as a
part of the drainage system. On the other hand, some links and requirements disappeared or went out
of sight during the phase of harmonization.
This paper should close this gap and gives additional information on application conditions for sanitary
appliances to avoid malfunction of the drainage system.
It is not intended to give guidance on the system standards like EN 12056.
1 Scope
This document describes the installation rules that must be followed to ensure proper functioning of
the drainage system depending on the specified performance of the sanitary appliances.
These performance characteristics of sanitary appliances (defined in the harmonized standards EN 997,
EN 13407, EN 14688, EN 14528 and EN 14527) are explained and brought into line with the application
rules of standard series EN 12056.
According to Regulation (EU) 305/2011, legally binding information on building requirements must be
provided by the National Product Information Point. Therefore, additional national requirements are
mentioned informatively where information is available.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 12056 (all parts), Gravity drainage systems inside buildings
EN 997, WC pans and WC suites with integral trap
EN 13407, Wall-hung urinals — Functional requirements and test methods
EN 14527, Shower trays for domestic purposes
EN 14528, Bidets — Functional requirements and test methods
EN 14688, Sanitary appliances — Wash basins — Functional requirements and test methods
EN 1717, Protection against pollution of potable water in water installations and general requirements of
devices to prevent pollution by backflow
EN 274 (all parts), Waste fittings for sanitary appliances
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Drinking water installation
When choosing sanitary appliances, the rules for drinking water protection have to be taken into
account as well. Such rules are defined, e.g. in EN 1717 and the corresponding product standards in case
the product is concerned. Guidance will be given in this document.
Special aspects of national legislation have to be taken into account.
5 The drainage system
5.1 Types of sewage water: black water and rain water
Waste water or black water consists out of all sewage water from kitchen, bathroom, lavatory and other
facilities.
The source of rain water is the roof drainage and other paved areas.
In case black water and rain water will be mixed, it is called combined waste water.
5.2 Types of building drainage system: separate sewerage system and combined
sewerage system
For the discharge of wastewater inside buildings, several pipings from the sanitary appliances to the
connecting piping, the connecting sewer and finally to the public sewage water system are used.
Separate sewerage system means the two piping’s, one for rain water and one for waste water. It´s not
allowed using the waste water piping for rain water.
The size of the piping for waste water has to be calculated according to the amount of waste water
linked to the sanitary appliances.
In case of a combined sewerage system, both types of sewage piping should be connected at the
connecting piping or the connecting sewer only. It is recommended to do so as close as possible to the
public sewage water system.
5.3 Drainage system: design and dimensioning
Design and dimensioning of the drainage system inside buildings is very important. It has to be taken
into account:
— minimum slope,
— minimum flow rate,
— filling level, and
— ventilation
of the drainage system.
Only in case all aspects are respected properly the function of the drainage system is warranted, i.e.
solids can be flushed out sufficient with the first flush and transported later on.
Wrong dimensioning will lead to failures such as:
— in case of too small pipes: the waste water system is not capable to take the complete waste water
and also ventilation. This means: blockage occurs;
— in case of too big pipes: solid waste will not be transported sufficiently. Blockages will occur.
Pouring down more water in the drain is not the solution.
5.4 Basis for drainage systems
Basic standard for drainage systems in Europe is the series of standards EN 12056 (Gravity drainage
systems inside buildings) consisting of:
— Part 1: General and performance requirements
— Part 2: Sanitary pipework, layout and calculation
— Part 3: Roof drainage, layout and calculation
— Part 4: Wastewater lifting plants. Layout and calculation
— Part 5: Installation and testing, instructions for operation, maintenance and use
The EN 12056 series has to be understood as a basic standard to be used as a European frame work.
Additional national rules have to be taken into account. Special aspects of national legislation may
overrule certain requirements of EN 12056.
If a reference to EN 12056 is made in the following, this refers to the series of the standard with all
parts.
6 Types of drainage systems
6.1 General
Different types of drainage system are installed all over Europe. Variations are based on differing types
of sanitary appliances, history of the installation and technical habits of building.
EN 12056 defines four types of drainage systems, which mainly differ in terms of allowed filling level in
the connecting pipes.
6.2 System I: Single discharge stack system with partly filled branch discharge pipes
Sanitary appliances are connected to partly filled branch discharge pipes. The partly filled branch
discharge pipes are designed with a filling degree of 0,5 (50 %) and are connected to a single discharge
stack.
6.3 System II: Single discharge stack system with small bore discharge branch pipes
Sanitary appliances are connected to small bore branch discharge pipes. The small bore branch
discharge pipes are designed with a filling degree of 0,7 (70 %) and are connected to a single discharge
stack.
6.4 System III: Single discharge stack system with full bore branch discharge pipes
Sanitary appliances are connected to full bore branch discharge pipes. The full bore branch discharge
pipes are designed with a filling degree of 1,0 (100 %) and each branc
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