scope:

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. 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. The following aspects are excluded from the scope: -- nits exceeding nominal 230/400V; - single phase units that exceed 16 A; - multi phase units that exceed 16 A per phase; - multiple units that exceed 16 A per phase in aggregate, for one installation; - issues of revenue rebalancing, metering or other commercial matters; - generators never to be connected to the supply networks. The intention of the CWA is to insure that micro-cogeneration satisfies appropriate provisions for: - safety of persons; - information to electricians working inside the house; - voltage quality; - reliability of supply; - protection of the cogeneration unit. Requirements for automatic disconnection and isolation regulations for safety purposes are included, however the CWA does not cover the safety of DNO personnel or their contracted parties, as their safety is a combination of the electrical conditions and working instructions, which is the responsibility of the DNO. Labour safety of electricians working in the house is covered by other standards.