SIST EN 476:2011

General requirements for components used in drains and sewers

This European standard specifies general requirements for components such as pipes, fittings and manholes with their respective joints intended for use in discharge pipes, drains and sewers ((result of merging EN 476, EN 773 and EN 1293))

Allgemeine Anforderungen an Bauteile für Abwasserleitungen und -kanäle

Diese Europäische Norm legt allgemeine Anforderungen an Bauteile innerhalb und außerhalb von Gebäuden (siehe EN 12056-1), wie Rohre, Formstücke und Einsteigschächte mit ihren jeweiligen Verbindungen fest, die für Abwasserleitungen und -kanäle bestimmt sind und die als Schwerkraftentwässerungssysteme (Freispiegelsystem) mit maximal 40 kPa betrieben werden. Sie legt ebenfalls allgemeine Anforderungen an Bauteile für hydraulisch und pneumatisch betriebene Abwasserdruckrohre, -leitungen und -kanäle fest. Sie enthält grundlegende Festlegungen, die für diese Anwendungen in den werkstoffbezogenen Produktnormen zu berücksichtigen sind. Sie ist nicht anwendbar zur direkten Beurteilung von Produkten. Sie ist als Referenz zur Erstellung einer Produktspezifikation anwendbar, sofern keine Produktnorm zur Verfügung steht.
ANMERKUNG Wird der Begriff „innerhalb von Gebäuden“ in Verbindung mit Bauteilen verwendet, die innerhalb des Gebäudes befestigt sind, schließt das auch an den Außenflächen der Gebäude befestigte Abwasserleitungen und Formstücke mit ein.
Diese Europäische Norm behandelt Bauteile, die in zufriedenstellender Weise eingesetzt werden, um
- häusliche Abwässer;
- Regen- und Oberflächenwasser; sowie
- weitere Abwässer (z. B. industrielles Abwasser), die zur Ableitung in das System zulässig sind, abzuleiten.
Diese Europäische Norm gilt für Bauteile mit kreisförmigem Querschnitt sowie weiteren Querschnitten. Diese Europäische Norm gilt gleichermaßen für werkseitig und, soweit zutreffend, für vor Ort hergestellte Bauteile. Diese Europäische Norm ist nicht auf Bauteile anwendbar, die bei grabenlosem Einbau nach EN 14457 verwendet werden und nicht für Bauteile, die für die Renovierung von Abwasserleitungen und -kanälen nach EN 13380 eingesetzt werden.

Prescriptions générales pour les composants utilisés dans les branchements et les collecteurs d'assainissement

La présente Norme européenne spécifie les prescriptions générales applicables aux composants tels que les tuyaux, les raccords et les regards avec leurs assemblages respectifs, destinés à être utilisés dans les canalisations d’évacuation, les branchements et les collecteurs fonctionnant comme des réseaux à écoulement libre, dans lesquels toute pression susceptible de se produire ne dépasse pas 40 kPa. Elle spécifie également les prescriptions générales applicables aux composants utilisés dans les canalisations d’évacuation, les branchements et les collecteurs sous pression hydraulique ou pneumatique, et fournit des spécifications de base et des prescriptions minimales à respecter pour toutes les normes de produits relatives à cette application. NOTE L’expression « à l’intérieur des bâtiments » est employée dans le contexte des composants fixés à l’intérieur des bâtiments et inclut également les canalisations d’évacuation et les raccords fixés aux surfaces extérieures des bâtiments. La présente Norme européenne traite des composants à utiliser pour transporter de manière satisfaisante : ⎯ les eaux usées domestiques ; ⎯ les eaux pluviales et les eaux de surface ; et, ⎯ d’autres eaux usées (par exemple, les eaux usées industrielles) qui n’endommageront pas les composants. La présente Norme européenne s’applique aux composants de section circulaire ou non. La présente Norme européenne s’applique de la même façon aux composants qui sont préfabriqués et aux composants construits in situ, le cas échéant. La présente Norme européenne ne s’applique pas aux composants utilisés pour la construction sans tranchée selon l’EN 14457, ni aux composants utilisés pour la rénovation des branchements et des collecteurs selon l’EN 13380.

Splošne zahteve za elemente za odvod odpadne vode in kanalizacijo

Ta evropski standard določa splošne zahteve za elemente, kot so cevi, fitingi in vstopne odprtine z ustreznimi spoji, ki se uporabljajo pri odtočnih ceveh, vodih in kanalih (rezultat združitve EN 476, EN 773 in EN 1293).

General Information

• Status: Withdrawn
• Publication Date: 10-Oct-2011
• Withdrawal Date: 10-May-2022
• ICS: 13.060.30 - Sewage water
• ICS: 93.030 - External sewage systems
• Technical Committee: IOVO - Water supply and waste water engineering
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 11-May-2022
• Due Date: 03-Jun-2022
• Completion Date: 11-May-2022
• Ref Project: EN 476:2011 - General requirements for components used in drains and sewers

Relations

• Replaced By: SIST EN 476:2022 - General requirements for components used in drains and sewers
• Effective Date: 01-Jul-2022
• Replaces: SIST EN 1293:2000 - General requirements for components used in pneumatically pressurized discharge pipes, drains and sewers
• Effective Date: 01-Nov-2011
• Replaces: SIST EN 773:2000 - General requirements for components used in hydraulically pressurized discharge pipes, drains and sewers
• Effective Date: 01-Nov-2011
• Replaces: SIST EN 476:1997 - General requirements for components used in discharge pipes, drains and sewers for gravity systems
• Effective Date: 01-Nov-2011

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 476:2011
01-november-2011
1DGRPHãþD
SIST EN 1293:2000
SIST EN 476:1997
SIST EN 773:2000
Splošne zahteve za elemente za odvod odpadne vode in kanalizacijo
General requirements for components used in drains and sewers
Allgemeine Anforderungen an Bauteile für Abwasserleitungen und -kanäle
Prescriptions générales pour les composants utilisés dans les branchements et les
collecteurs d'assainissement
Ta slovenski standard je istoveten z: EN 476:2011
ICS:
13.060.30 Odpadna voda Sewage water
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
SIST EN 476:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 476:2011

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SIST EN 476:2011


EUROPEAN STANDARD
EN 476

NORME EUROPÉENNE

EUROPÄISCHE NORM
January 2011
ICS 93.030 Supersedes EN 1293:1999, EN 476:1997, EN 773:1999
English Version
General requirements for components used in drains and
sewers
Exigences générales pour les composants utilisés pour les Allgemeine Anforderungen an Bauteile für
branchements et les collecteurs d'assainissement Abwasserleitungen und -kanäle
This European Standard was approved by CEN on 23 November 2010.

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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same
status as the official versions.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 476:2011: E
worldwide for CEN national Members.

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SIST EN 476:2011
EN 476:2011 (E)
Contents Page
Foreword .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Symbols and abbreviations .9
5 Dimensional requirements .9
5.1 General .9
5.2 Dimensions of pipes and fittings .9
5.2.1 Nominal sizes .9
5.2.2 Internal diameters and tolerances . 10
5.2.3 Geometrical characteristics of pipes . 10
5.2.4 Geometrical characteristics of fittings . 11
5.3 Dimensions of manholes and inspection chambers. 12
5.3.1 General . 12
5.3.2 Manholes with access for cleaning and inspection by personnel . 12
5.3.3 Manholes with access for cleaning and inspection by personnel in only exceptional
circumstances . 12
5.3.4 Inspection chambers . 13
5.4 Interconnection . 13
6 Performance requirements . 14
6.1 Mechanical resistance of pipes and fittings . 14
6.1.1 Mechanical strength of pipes and fittings in the cross section . 14
6.1.2 Longitudinal bending moment resistance . 15
6.2 Mechanical resistance of manholes, shafts and inspection chambers above the base unit . 15
6.2.1 General . 15
6.2.2 Circular sections . 15
6.2.3 Other shapes . 15
6.2.4 Tapers, reducing and cover slabs. 15
6.3 Tightness . 16
6.3.1 Maximum internal test pressure . 16
6.3.2 Seals for joints . 17
6.3.3 Rigid joints . 17
6.3.4 Joint deflection . 17
6.3.5 Joint shear load . 18
6.3.6 Restrained joints . 18
6.4 Continuity of invert . 18
6.5 Temperature . 18
6.6 Dimensional stability . 19
6.7 Smoothness of bore . 19
6.8 Appearance . 19
6.9 Corrosion resistance . 19
6.10 Abrasion resistance . 19
6.11 Coatings and linings . 19
6.12 Long-term behaviour . 19
6.13 Durability . 20
6.14 Sealing elements. 20
6.15 Resistance against cleaning operations . 20
6.16 Handling . 20
2

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SIST EN 476:2011
EN 476:2011 (E)
7 Test methods . 20
7.1 Measurement of dimensions . 20
7.1.1 Mean internal diameter of barrels . 20
7.1.2 Mean external diameter of barrels . 20
7.1.3 Spigots and sockets . 20
7.1.4 Wall thickness of barrels . 20
7.1.5 Deviation from straightness of barrels . 21
7.1.6 Deviation from squareness of the ends of the pipes . 21
7.2 Load bearing capacity tests . 21
7.2.1 Load bearing capacity tests for pipes . 21
7.2.2 Load bearing capacity tests for sections of manholes and shafts . 22
7.3 Longitudinal bending moment resistance test for pipes . 22
7.4 Tightness tests . 22
7.4.1 Tightness test of pipes, fittings, manholes and inspection chambers . 22
7.4.2 Tightness test of joints . 24
7.4.3 Test methods for discharge components for use inside buildings . 24
8 Marking, labelling and packaging . 25
Bibliography . 26

3

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SIST EN 476:2011
EN 476:2011 (E)
Foreword
This document (EN 476:2011) has been prepared by Technical Committee CEN/TC 165 “Waste water
engineering”, the secretariat of which is held by DIN.
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 July 2011, and conflicting national standards shall be withdrawn at the
latest by July 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 476:1997, EN 773:1999 and EN 1293:1999.
The specifications of this standard have been based on the requirements for wastewater systems specified in
EN 752 and EN 12056.
This document is the result of merging EN 476, EN 773 and EN 1293.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
4

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SIST EN 476:2011
EN 476:2011 (E)
1 Scope
This European Standard specifies general requirements for components inside and outside buildings (see
EN 12056-1) such as pipes, fittings and manholes with their respective joints intended for use in discharge
pipes, drains and sewers which operate as gravity systems allowing for a maximum pressure of 40 kPa.
It also specifies general requirements for components used in hydraulically and pneumatically pressurised
discharge pipes, drains and sewers.
It provides basic specifications to be respected in material related product standards for these applications.
It is not applicable for the direct evaluation of products. It is applicable as a reference for drawing up a product
specification, if there is no product standard available.
NOTE Where the term "inside buildings" is used in the context of components fixed inside buildings, it also includes
discharge pipes and fittings fixed on external surfaces of buildings.
This European Standard covers components to be used in conveying in a satisfactory manner:
 domestic wastewater;
 rainwater and surface water; and
 other waste waters acceptable for discharge into the system (e.g. industrial wastewater).
This European Standard applies to components of circular and other cross sections.
This European Standard applies equally to components which are factory-made and to those constructed on
site, where applicable.
This European Standard does not apply to components used for trenchless construction according to
EN 14457 and for components used for renovation of drains and sewers according to EN 13380.
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 124, Gully tops and manhole tops for vehicular and pedestrian areas — Design requirements, type testing,
marking, quality control
EN 681-1, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 1: Vulcanized rubber
EN 681-2, Elastomeric Seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 2: Thermoplastic elastomers
EN 681-3, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 3: Cellular materials of vulcanized rubber
EN 681-4, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 4: Cast polyurethane sealing elements
EN 805:2000, Water supply — Requirements for systems and components outside buildings
5

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SIST EN 476:2011
EN 476:2011 (E)
EN 1085:2007, Wastewater treatment — Vocabulary
EN 13101, Steps for underground man entry chambers — Requirements, marking, testing and evaluation of
conformity
EN 14396, Fixed ladders for manholes
EN 14801, Conditions for pressure classification of products for water and wastewater pipelines
ISO 48, Rubber, vulcanized or thermoplastic  Determination of hardness (hardness between 10 IRHD and
100 IRHD)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1085:2007 and EN 805:2000 and the
following apply.
3.1
hydraulically pressurised system
system where flow is caused by hydraulic pressure and where the pipe normally operates full
3.2
pneumatically pressurized system
system where flow is caused by pneumatic pressure which can be applied either as compressed air upstream
or partial vacuum downstream and where the pipe normally operates full
3.3
nominal size
DN
numerical designation of size of component, which is a convenient integer approximately equal to a
manufacturing dimension in millimetres and can apply to either the internal diameter (DN/ID) or the external
diameter (DN/OD)
NOTE DN/OD pipes with solid or hollow spiral or annular profiled external surface and outside smooth spigot jointing
dimensions, and with larger OD than the spigot may be designated by the spigot dimension.
3.4
external diameter
OD
mean external dimension of the pipe barrel at any cross section where for pipes with external profiles on the
barrels, the external diameter is the maximum diameter when viewed in cross section
3.5
internal diameter
ID
mean internal dimension of the pipe barrel at any cross section
3.6
pipe barrel
cylindrical part of the pipe with a uniform longitudinal profile excluding socket and spigot
3.7
invert
lowest point of the internal surface of the barrel of a pipe or channel at any cross section
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SIST EN 476:2011
EN 476:2011 (E)
3.8
rigid pipe
pipe, the load carrying capacity of which is limited by breaking or overstressing, without significant deformation
of its cross section
3.9
semi-rigid pipe
pipe whose load carrying capacity is limited either by deformation/overstressing (flexible behaviour) or by
breaking (rigid behaviour) depending on its ring stiffness
3.10
flexible pipe
pipe, the load carrying capacity of which is limited by diametral deformation under load to the ultimate design
criteria without breaking or overstressing
3.11
joint
connection between the adjacent ends of two components including the means of sealing
3.12
adjustable fitting
fitting which is designed to permit specific angular deflection at the time of installation (for pressurized and
vacuum systems)
3.13
adjustable joint
joint which permits significant angular deflection at the time of installation but not thereafter
3.14
flexible joint
joint which permits angular deflection
3.15
rigid joint
joint that does not permit angular deflection
3.16
restrained joint
joint in which a means is provided to prevent separation
3.17
proof load
specified test load which a component withstands where the related requirements of the product standard are
met
3.18
ultimate load
load which causes failure of a component (under test) which shall be as specified in product standards
3.19
crushing strength
load per unit length a rigid pipe is required to withstand in kN/m
3.20
ring stiffness
resistance of a pipe to diametral deflection in response to external loading applied along one diametric plane
given as follows:
7

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SIST EN 476:2011
EN 476:2011 (E)
E ⋅ I

S =
3
D
m
3.21
manhole
chamber with a removable cover constructed on a drain or sewer to permit entry by personnel
[EN 752:2008, 3.41]
NOTE Examples are given in Figure 1.

Key
1 adjusting unit 5 reducing slab
2 base unit 6 shaft unit
3 cover slab 7 taper
4 chamber unit
NOTE 1 Joint details have been omitted for clarity
NOTE 2 Precast base slabs of structures can be integral with the base unit or a separate slab incorporating
construction joints.
Figure 1 — Description of manhole and inspection chamber components
3.22
inspection chamber
chamber with a removable cover constructed on a drain or sewer that permits the introduction of cleaning and
inspection equipment from surface level, but does not provide access for personnel
[EN 752:2008, 3.34]
8

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SIST EN 476:2011
EN 476:2011 (E)
4 Symbols and abbreviations
DN/ID nominal size related to the internal diameter
DN/OD nominal size related to the external diameter
PFA allowable operating pressure [EN 805:2000]
PMA allowable maximum operating pressure [EN 805:2000]
PEA allowable site test pressure [EN 805:2000]
D diameter of the neutral axis of the pipe wall, in metres
m
E  modulus of elasticity in flexure in the circumferential direction in kilonewtons per square metre
I  second moment of area of the pipe wall in the longitudinal direction, per unit length, in metres to the
 fourth power per metre
S  the ring stiffness of the pipe in kilonewtons per square metre
r radius for bends
α  angle of bends
β angle of branches
5 Dimensional requirements
5.1 General
Product standards may include specifications which are more stringent, but not less stringent than those in
this standard.
5.2 Dimensions of pipes and fittings
5.2.1 Nominal sizes
Nominal sizes DN shall be given in product standards as DN/ID or DN/OD and shall preferably be selected
from Table 1 or Table 2 for reasons of interchangeability. Other nominal sizes can be specified in product
standards.
Table 1 — Preferred nominal sizes DN/ID
Gravity systems Hydraulically pressurized systems Pneumatically pressurized
systems

DN/ID DN/ID DN/ID
30, 40, 50, 60, 70, 80, 90, 100, 125, 20, 25, 30, 40, 50, 60, 80, 100, 125, 150, 30, 40, 50, 60, 80, 100, 125, 150,
150, 200, 225, 250, 300, 350, 375, 200, 250, 300, 350, 400, 450, 500, 600, 200
400, 450, 500, 600, 700, 800, 900, 700, 800, 900, 1 000, 1 100, 1 200,
1 000, 1 200, 1 250, 1 400, 1 500 1 250, 1 300, 1 400, 1 500, 1 600, 1 800,
1 600, 1 800, 2 000, 2 200, 2 500, 2 000, 2 100, 2 200, 2 400, 2 500, 2 600,
2 800, 3 000, 3 500, 4 000 2 800, 3 000, 3 200, 3 500, 4 000
NOTE For each material, it is intended to limit the number of nominal sizes.
9

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SIST EN 476:2011
EN 476:2011 (E)
Table 2 — Preferred nominal sizes DN/OD
Gravity systems Hydraulically pressurized Pneumatically pressurized
systems systems
DN/OD DN/OD DN/OD
32, 40, 50, 63, 75, 90, 100, 110, 22, 25, 28, 32, 40, 50, 63, 75,90, 32, 40, 50, 63, 75, 90, 100, 110,
125, 160, 200, 250, 315, 400, 500, 100, 110, 125, 140, 160, 180, 200, 125, 140, 160, 180, 200
630, 800, 1 000, 1 200, 1 400, 225, 250, 280, 315, 355, 400, 450,
1 600, 1 800, 2 000 500, 560, 630, 710, 800, 900,
1 000
NOTE For each material, it is intended to limit the number of nominal sizes.

For non circular cross sections dimensions can be specified in product standards.
5.2.2 Internal diameters and tolerances
Product standards shall specify:
 internal diameters and tolerances; or
 external diameters, wall thicknesses and tolerances; or
 minimum internal diameter.
Maximum tolerances on the internal diameter ID are listed in Table 3.
Table 3 — Maximum tolerances on internal diameters
Nominal size Gravity, hydraulically and pneumatically pressurized
systems
Tolerances on mean internal Tolerances on individual
diameter internal diameter
mm mm
± 0,05 × DN ± 0,1 × DN
DN ≤ 100
± 5 ± 10
100 < DN ≤ 250
250 < DN ≤ 600 ± 0,02 × DN ± 0,04 × DN
DN > 600 ± 15 ± 30
NOTE DN can be applied to either DN/ID or DN/OD.

5.2.3 Geometrical characteristics of pipes
Pipe straightness shall be within tolerances specified in product standards (see 7.1.5).
Pipes for pressurised systems may also be delivered in coils. Product standards shall specify the minimum
radius of the coils instead of straightness.
The angle between the planes of the end faces of the pipe and the relevant axis shall be 90° with a tolerance
such that the function of the pipe joint shall not be impaired (see 7.1.6).
A range of pipe lengths can be specified in product standards.
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SIST EN 476:2011
EN 476:2011 (E)
Product standards shall specify tolerances on pipe lengths, even if the lengths themselves are not specified.
For pressurised systems, tolerances on the wall thickness shall be specified in product standards.
5.2.4 Geometrical characteristics of fittings
5.2.4.1 General
Angles of fittings shall be specified in the product standards. Where applicable, tolerances on angles shall be
specified in product standards.
5.2.4.2 Bends
Angles α for bends (see Figure 2) shall be specified in product standards. Angles α should preferably be
selected from 11°15', 15°, 20° to 22°30', 30°, 45°, 60° 67° to 70° and 87° to 90°. Other angles α may be
specified in product standards.
NOTE Radii r for bends (e.g. swept and unswept) should be specified in product standards.

Key
r radius of bend
α angle of bend
Figure 2— Illustrations of angle αααα and radius of bends r
5.2.4.3 Branches
Angles β for branches (see Figure 3) specified in product standards should preferably be selected from 45°,
60° to 70° or 87° to 90°.
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SIST EN 476:2011
EN 476:2011 (E)

Key
β angle of branches
Figure 3 — Illustrations of angle ββββ of branches
5.3 Dimensions of manholes and inspection chambers
5.3.1 General
Dimensions of manholes with access for personnel shall comply with the safety requirements in force at the
place of installation. In the absence of local regulations the diameter of the clear opening of the manhole cover
according to EN 124 shall be ≥ 600 mm (see Figure 4). For manholes where steps or ladders are integrated
during production, the load requirements and test methods shall be specified in accordance with EN 13101 or
EN 14396 respectively.
5.3.2 Manholes with access for cleaning and inspection by personnel
Manholes for all maintenance works with access for personnel shall have internal diameter (ID) and
dimensions according to Figures 4 a) and b), or a nominal size for rectangular sections of
750 mm × 1 200 mm or greater or square sections of 1 000 mm × 1 000 mm or greater, or a nominal size for
elliptical sections of 900 mm × 1 100 mm or greater.
NOTE National or local regulations or the relevant authority can specify larger minimum dimensions e.g. for the
access.
5.3.3 Manholes with access for cleaning and inspection by personnel in only exceptional
circumstances
Manholes for the introduction of cleaning equipment, inspection and test equipment with exceptional
possibility of access for a man equipped with a harness, shall have internal diameter (ID) and dimensions
according to Figure 4 c) or a nominal size for rectangular sections of 750 mm × 1 000 mm or greater or square
sections of 800 mm × 800 mm or greater, or a nominal size for elliptical sections of 800 mm × 1 000 mm or
greater.
NOTE National or local regulations or the relevant authority can specify larger minimum dimensions e.g. for the
access.
12

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SIST EN 476:2011
EN 476:2011 (E)
Dimensions in millimetres


a) b) c)
a
The 450 mm shaft depth (including the straight part of the taper, if applicable) is required to allow the first step or ladder rung to be
in an accessible position. For septic tanks or separators, this dimension can be increased up to 600 mm.
Figure 4 — Dimensions of circular manholes
5.3.4 Inspection chambers
Inspection chambers having DN/ID's less than 800 permit the introduction of cleaning, inspection and test
equipment, but do not provide access for personnel.
5.4 Interconnection
Product standards shall state whether or not components within dimensional series (or tolerances) are
capable of interconnection.
Where such interconnection is not confirmed, product standards shall specify which means (e.g. adaptors) are
required to effect interconnection.
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SIST EN 476:2011
EN 476:2011 (E)
6 Performance requirements
6.1 Mechanical resistance of pipes and fittings
6.1.1 Mechanical strength of pipes and fittings in the cross section
Mechanical strength requirements according to Table 4 shall be specified in product standards. Depending on
the material, additional requirements can be necessary.
Table 4 — Mechanical requirements of pipes and fittings in the cross section
Drains and sewers Requirements t
...