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Multi-Source / Microgrid Interconnection Certificate

This certificate records the commissioning of an interconnection between multiple power sources — utility, solar PV, battery storage or generator — into a single system or microgrid. It documents the interconnection point, busbar loading calculations, and the protective settings that keep sources in sync.

NEC Article 705 (Interconnected Electric Power Production Sources), NEC 705.12 (busbar/120% rule), NEC Article 712 (DC Microgrids), utility interconnection agreementValid: One-off (no expiry)

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Sample Microgrid Interconnection certificate

Sample Multi-Source / Microgrid Interconnection Certificate certificate created with CertBox, showing the professional PDF layout with interconnected sources and ratings, point of interconnection and busbar loading, overcurrent and back-feed protection

Sample Microgrid Interconnection with fictional data. All personal details shown are fake.

What it covers

  • Interconnected sources and ratings
  • Point of interconnection and busbar loading
  • Overcurrent and back-feed protection
  • Rapid shutdown and disconnect means
  • Utility interconnection approval
  • Commissioning test results

Who needs a Microgrid Interconnection?

Solar-plus-storage installers
Microgrid integrators
Commercial facilities
Electrical contractors

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Frequently asked questions about Microgrid Interconnection

What is the NEC 120% rule?
NEC 705.12 limits the sum of the utility and the back-fed source overcurrent devices on a busbar. A common allowance lets the combined rating reach 120% of the busbar ampacity when the breakers are at opposite ends. Always calculate to the current NEC edition adopted locally.
Do microgrid interconnections need utility approval?
Yes. Any source that can parallel with or back-feed the grid normally requires a signed interconnection agreement and permission to operate from the utility before it is energized.

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