Energy storage container grounding

Can pre-engineered and self-contained energy storage systems have working space?

Language found in the last paragraph at 706.10 (C) advises that pre-engineered and self-contained energy storage systems are permitted to have working space between components within the system in accordance with the manufacturer’s recommendations and listing of the system.

What is an energy storage system?

An energy storage system consisting of batteries installed at a single-family dwelling inside a garage. Article 706 is primarily the result of the work developed by a 79-member Direct Current (DC) Task Group formed by the NEC Correlating Committee.

What is required working space in and around the energy storage system?

The required working spaces in and around the energy storage system must also comply with 110.26. Working space is measured from the edge of the ESS modules, battery cabinets, racks, or trays.

Are energy storage systems connected to other energy sources?

Energy storage systems can be (and typically are) connected to other energy sources, such as the local utility distribution system. There may be one or more sources connected to an ESS. The connection to other energy sources is required to comply with the requirements of 705.12.

Are energy storage systems safe?

The emergence of energy storage systems (ESSs), due to production from alternative energies such as wind and solar installations, has driven the need for installation requirements within the National Electrical Code (NEC) for the safe installation of these energy storage systems.

Why do we need a battery energy storage system?

Demand for energy storage is on the rise. The increase in extreme weather and power outages also continue to contribute to growing demand for battery energy storage systems (BESS). As a result, there are many questions about sizing and optimizing BESS to provide either energy, grid ancillary services, and/or site backup and blackstart capability.