EN 61770:2009/prAC:2025
(Amendment)Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets
Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets
The standard specifies requirements for appliances for household and similar purposes to prevent the backflow of non-potable water into the water mains. It also specifies requirements for hose sets used for connecting such appliances to the water mains that supply water at a pressure not exceeding 1 MPa.
Elektrische Geräte zum Anschluss an die Wasserversorgungsanlage - Vermeidung von Rücksaugung und des Versagens von Schlauchsätzen
Appareils électriques raccordés au réseau d'alimentation en eau - Exigences pour éviter le retour d'eau par siphonnage et la défaillance des ensembles de raccordement
Električne naprave, priključene na vodovod - Preprečevanje povratnega vodnega udara in odpovedi cevnega sestava - Popravek AC
General Information
- Status
- Not Published
- Publication Date
- 13-Apr-2027
- Technical Committee
- CLC/TC 61 - Safety of household and similar electrical appliances
- Current Stage
- 4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
- Start Date
- 19-Dec-2025
- Due Date
- 18-Feb-2026
- Completion Date
- 19-Dec-2025
Relations
- Effective Date
- 22-Oct-2024
Overview
EN 61770:2009/prAC:2025 (CLC) is a draft amendment to the European standard EN 61770:2009 that specifies requirements for electric appliances connected to the water mains to prevent the backflow of non‑potable water into the public supply and to reduce the risk of hose‑set failure. The document covers household and similar appliances and associated hose sets used on water mains supplying water at pressures up to 1 MPa. This prAC (2025) was prepared by CLC/TC 61 in collaboration with CEN/TC 164 and is currently submitted for enquiry within CENELEC.
Key topics and technical requirements
- Scope of protection
- Prevention of backsiphonage and backflow from appliances into the water mains.
- Requirements apply to household and similar electrical appliances and connecting hose‑sets (≤ 1 MPa).
- Backflow prevention devices
- Instruction requirements: manuals must give guidance on installation and the type of backflow prevention device to use.
- Note: Certain clause requirements (4.1 and 4.2) do not apply to the backflow prevention device Category 2 shown in Figure Z22 (as referenced in the amendment).
- Air gaps
- Air gap AD calculations must use the upstream feed orifice D (n.3 of Figure Z5).
- If multiple upstream feed orifices exist, each is evaluated as a separate AD air gap.
- Pipe interrupters
- No specific orientation is required for pipe interrupters when applying the standard.
- Clarification: a water diverter valve is not considered a closing element.
- Hose‑set requirements
- Hose sets intended for connecting appliances are covered to reduce failure and consequent contamination risk; intended operating pressure up to 1 MPa.
Applications and users
This standard is practical for:
- Appliance manufacturers (washers, dishwashers, water‑connected appliances) - to design safe inlet connections and provide compliant instructions.
- Hose‑set and component suppliers - to ensure materials and fittings meet the backflow and mechanical integrity expectations.
- Installers and plumbers - for correct selection and installation of backflow prevention measures and hose connections.
- Test laboratories and conformity assessors - for evaluating compliance with EN 61770 requirements.
- Water utilities and regulators - to reference in guidance and national implementation to protect potable water supplies.
Related standards
- EN 61770:2009 and its earlier amendments (AC/A1/A11/…) - this prAC 2025 proposes modifications to that base standard.
- EN IEC 61010 - appliances for medical purposes are excluded from this standard where covered by the EN IEC 61010 series.
- CEN/TC 164 publications on water supply systems (context for backflow prevention).
Keywords: EN 61770, backsiphonage, backflow prevention, hose‑set failure, water mains, household appliances, air gap, pipe interrupter, CENELEC, CLC/TC 61.
Frequently Asked Questions
EN 61770:2009/prAC:2025 is a draft published by CLC. Its full title is "Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets". This standard covers: The standard specifies requirements for appliances for household and similar purposes to prevent the backflow of non-potable water into the water mains. It also specifies requirements for hose sets used for connecting such appliances to the water mains that supply water at a pressure not exceeding 1 MPa.
The standard specifies requirements for appliances for household and similar purposes to prevent the backflow of non-potable water into the water mains. It also specifies requirements for hose sets used for connecting such appliances to the water mains that supply water at a pressure not exceeding 1 MPa.
EN 61770:2009/prAC:2025 is classified under the following ICS (International Classification for Standards) categories: 91.140.60 - Water supply systems; 97.030 - Domestic electrical appliances in general. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 61770:2009/prAC:2025 has the following relationships with other standards: It is inter standard links to EN 61770:2009. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN 61770:2009/prAC:2025 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CLC standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2025
Električne naprave, priključene na vodovod - Preprečevanje povratnega vodnega
udara in odpovedi cevnega sestava - Popravek AC
Electric appliances connected to the water mains - Avoidance of backsiphonage and
failure of hose-sets
Elektrische Geräte zum Anschluss an die Wasserversorgungsanlage - Vermeidung von
Rücksaugung und des Versagens von Schlauchsätzen
Appareils électriques raccordés au réseau d'alimentation en eau - Exigences pour éviter
le retour d'eau par siphonnage et la défaillance des ensembles de raccordement
Ta slovenski standard je istoveten z: EN 61770:2009/prAC:2025
ICS:
91.140.60 Sistemi za oskrbo z vodo Water supply systems
97.030 Električni aparati za dom na Domestic electrical
splošno appliances in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD DRAFT
EN 61770:2009
NORME EUROPÉENNE
EUROPÄISCHE NORM
prAC
September 2025
ICS 91.140.60; 97.030 -
English Version
Electric appliances connected to the water mains - Avoidance of
backsiphonage and failure of hose-sets
Appareils électriques raccordés au réseau d'alimentation en Elektrische Geräte zum Anschluss an die
eau - Exigences pour éviter le retour d'eau par siphonnage Wasserversorgungsanlage - Vermeidung von Rücksaugung
et la défaillance des ensembles de raccordement und des Versagens von Schlauchsätzen
This draft amendment prAC, if approved, will modify the European Standard EN 61770:2009; it is submitted to CENELEC members for
enquiry.
Deadline for CENELEC: 2025-12-12.
It has been drawn up by CLC/TC 61.
If this draft becomes an amendment, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of a national standard without any alteration.
This draft amendment was established by CENELEC 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 CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 80829 Ref. No. EN 61770:2009/prAC:2
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