November 23, 2022

NEC Disconnect Requirements for Energy Storage Systems

Got questions about how to disconnect energy storage systems in compliance with the 2017 and 2020 National Electrical Code? Find answers here.
Electrical disconnect switch

No matter what type of energy storage system you might encounter in an emergency, public safety depends on simple, uniform, and consistent procedures for isolating the system and disconnecting it.

Citing requirements from NEC 2017 and 2020, this informational bulletin discusses methods of disconnection and where to locate energy storage system (ESS) disconnects. The document defines key terms for components used to disconnect an ESS. It also notes where NEC 2020 introduced new code provisions and where requirements have stayed the same.

SEAC’s Storage Snapshot working group created sample system design drawings and provided other reference visuals for the document, including a site directory and three equipment disconnect labels.

The Clarifying NEC Requirements of ESS Disconnecting Means informational bulletin can help inform first responders, homeowners, and other untrained people. SEAC published the document in November 2022.

SEAC makes this informational bulletin publicly accessible to anyone who fills in the download form on this page. Your privacy is important to us. We do not sell or share your personal data.

This material is based upon work supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy and Technologies Office Award Number DE-EE0009001.0000. The views expressed herein do not necessarily represent the views of the U.S. Department of Energy or the United States Government.