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DIN EN IEC 63402-1 VDE 0849-402-1:2026-06

Energy efficiency – Customer energy management systems

Part 1: General requirements and architecture

(IEC 63402-1:2025); German version EN IEC 63402-1:2025
Class/Status: Standard, valid
Released: 2026-06
VDE Art. No.: 0801107

Note: You can pre-order this document (delivery subject to availability). Valid from 2026-06-01.

This document specifies General Requirements and Architecture of an application layer interface between the Customer Energy Manager (CEM) and Smart Devices (SD) operating within the smart grid premises-side system (i.e. home or building but not industrial premises).
This standard does not include requirements for:
– safety;
– EMC;
– Data security; it is assumed that the underlying protocols will take the data security aspect into account;
– Special equipment (e. g. legacy heat pumps) with a direct physical connection to the grid, as such equipment bypasses the CEM and is not HBES/BACS enabled (covered by other standards than the EN 50491 series).

This Document is related to the following Topics (in bold):

27	ENERGY AND HEAT TRANSFER ENGINEERING
27.010	Energy and heat transfer engineering in general
27.015	Energy efficiency. Energy conservation in general
27.060	Burners. Boilers
27.070	Fuel cells
27.075	Hydrogen technologies
27.080	Heat pumps
27.100	Power stations in general
27.120	Nuclear energy engineering
27.140	Hydraulic energy engineering
27.160	Solar energy engineering
27.180	Wind turbine energy systems
27.190	Biological sources and alternative sources of energy
27.200	Refrigerating technology
91	CONSTRUCTION MATERIALS AND BUILDING
91.010	Construction industry
91.020	Physical planning. Town planning
91.040	Buildings
91.060	Elements of buildings
91.080	Structures of buildings
91.090	External structures
91.120	Protection of and in buildings
91.140	Installations in buildings
91.160	Lighting
91.200	Construction technology
91.220	Construction equipment

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DIN EN IEC 63402-1 VDE 0849-402-1:2026-06

Energy efficiency – Customer energy management systems

Part 1: General requirements and architecture

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