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Completion Certificate (Sub-50kVA)

The Irish Electrical Completion Certificate (No. 1) is issued by a Safe Electric registered electrical contractor upon completion of a new electrical installation or full rewire with a supply capacity below 50kVA. It certifies that the installation has been designed, constructed, inspected, and tested in accordance with I.S. 10101 (National Rules for Electrical Installations) and is safe for use. This certificate is mandatory for all new domestic and small commercial electrical installations in Ireland. CertBox produces the supporting test record; the Completion Certificate itself must be issued on the numbered form supplied by Safe Electric.

I.S. 10101:2020 (National Rules for Electrical Installations, as amended by A1:2024), S.I. 256 of 2007 (Electricity Regulation), Safe Electric schemeValid: No fixed expiry — attached to the installation

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Sample Completion Certificate No. 1 certificate

Sample Completion Certificate (Sub-50kVA) certificate created with CertBox, showing the professional PDF layout with installation address, client details, and description of work, earthing system (tn-s, tn-c-s, tt) and supply characteristics, ze at origin and prospective fault current (ipf)

Sample Completion Certificate No. 1 with fictional data. All personal details shown are fake.

What it covers

  • Installation address, client details, and description of work
  • Earthing system (TN-S, TN-C-S, TT) and supply characteristics
  • Ze at origin and prospective fault current (Ipf)
  • Distribution board make, type, and main switch rating
  • Circuit schedule with cable sizes, protective devices, and ratings
  • Test results per circuit: R1+R2, Zs, insulation resistance, polarity, and RCD trip time
  • Safe Electric registration number and contractor signature

Who needs a Completion Certificate No. 1?

Safe Electric registered electrical contractors
Homeowners with new wiring or full rewires
Developers and self-build clients
Small commercial property owners

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Frequently asked questions about Completion Certificate No. 1

When is a Completion Certificate No. 1 required in Ireland?
A Completion Certificate No. 1 is required for all new electrical installations and full rewires with a supply below 50kVA. This covers most domestic properties. The certificate must be issued by a Safe Electric registered contractor before the installation is energised or handed over to the client.
Who can issue an electrical completion certificate in Ireland?
Only a contractor registered under the Safe Electric scheme — operated by RECI (Register of Electrical Contractors of Ireland) — can issue a valid electrical completion certificate. The contractor's Safe Electric number must appear on the certificate.
What is the difference between I.S. 10101 and BS 7671?
I.S. 10101:2020 is the current Irish National Rules for Electrical Installations, published by the NSAI. It replaced the older ET 101 (last edition ET 101:2008) in 2020 and is broadly aligned with IEC standards — it is Ireland's equivalent of the UK's BS 7671 Wiring Regulations. Irish certificates must reference I.S. 10101, not BS 7671.

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