Understanding NC6 and NC7 in Simple Terms
If you’re installing domestic solar PV in Ireland — whether for a home or small business — it’s important to understand the difference between two ESB Networks forms: NC6 and NC7. These forms help ESB Networks monitor and manage grid connections for solar installations.
NC6 — For Smaller Domestic Systems or Commercial Systems
The NC6 notification is required for domestic solar PV systems and is generally used when the inverter size does not exceed the basic threshold for commercial installations. The threshold is below 6kw for any Single Phase connection and 10kw for a Three Phase connection.
In practical terms:
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NC6 applies when you are installing a standard rooftop solar array on a home or small property and the inverter is under 6kw.
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It is the form used to inform ESB Networks that a solar PV installation has taken place and that the system will export electricity to the grid under the standard allowable export limits.
For homeowners and installers, NC6 is the most common ESB form encountered during residential installations. It is often submitted when the system installation is agreed and must be managed correctly to ensure the grid connection is logged and compliant with ESB standards.
NC7 — For Larger Residential or Higher Capacity Systems
The NC7 form applies when a system’s electrical characteristics exceed the standard NC6 domestic thresholds — for example, larger capacity systems or installations that require more detailed grid interaction.
Key differences in usage:
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NC7 is used for larger rooftop systems (still considered domestic, but above certain technical limits).
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It often applies to three-phase domestic systems or installations where the export threshold or inverter size is higher than typical small residential systems.
Because NC7 submissions require more technical data and careful handling to ensure compliance with ESB Networks grid requirements, they are often prepared by experienced installers or with professional support.
Why the Difference Matters
There are three main reasons understanding NC6 vs NC7 matters:
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Compliance: Choosing the correct form ensures you meet ESB Networks requirements quickly and without rework.
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System Size Thresholds: The type of system you install (single-phase vs three-phase, and capacity) determines which form is appropriate.
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Installer Responsibility: Misfiling can lead to follow-up queries, delays or grid rejection, which is why many installers use professional support for NC7 when systems approach higher capacities.
How Solar Admin Ireland Can Help
At SolarAdmin Ireland, we assist installers with both NC6 and NC7 submissions to ESB Networks. Whether a domestic rooftop needs a straightforward NC6 notification or a higher-capacity installation requires an NC7 application, we ensure compliance, accuracy, and timely submission so your installations proceed without admin delays.