CEN/WS 005 - Domestic Micro-Cogeneration

Micro-cogeneration is the generation of electricity and the recovery and use of the thermal energy
supplying the needs of domestic premises. This CEN Workshop Agreement covers the electrical
interface between the appliance and the low-voltage electrical network (nominal 230/400 V). Specific
elements like metering are not included. The intention of the CWA is to recommend future good
practice, noting that the CWA, local existing standards and practices may require modification in the
future due to larger market penetration and the associated return of experience.
NOTE The CWA reflects a pan-European view on best practice for the connection of micro-cogeneration; however it may not
be the most appropriate document for use in all countries and under all circumstances.
The following aspects are included in the scope:
· all technologies for micro-cogeneration are applicable;
· all generator types are applicable;
· the size is limited to a maximum of 16A per phase in a single low-voltage
installation (nominal 230/400V)
· both 3-phase and single-phase connections are applicable;
· connection is limited to low voltage networks;
· the electrical interface is the principal focus and this includes the method of
connection, the settings and protection requirements for connection, the operation
of the electrical interface under normal conditions, emergency shutdown,
distribution network-independent operation, start-up and distribution network
synchronisation;
· this document relates to the electrical interface only as existing standards and
directives apply to the other parts of the system;
· this document covers technical issues of connection.
NOTE The size is maybe increased up to 20 A (24 A) in accordance to the existing national standards in Germany, Austria,