Overview

Commissioning and maintenance are crucial for achieving optimal performance and longevity for Energy Storage Systems (ESSs). However, previous NEC versions only covered maintenance requirements in Section 706.7, lacking clarity on the commissioning needs of ESS installations and failing to differentiate between maintenance work needed for different settings. In the 2023 version, these concerns were addressed by introducing two new subsections. Subsection (A) now mandates commissioning for all ESSs except in one- and two-family dwellings, while subsection (B) exempts detailed maintenance for ESSs in these dwellings. These changes aim to clarify and streamline commissioning and maintenance procedures for ESS systems.

Applying the 2023 Code

Commissioning and maintenance are vital for Energy Storage System (ESS) installations to guarantee optimal performance and longevity. Commissioning entails thorough testing and validation of the system to ensure its functionality, safety, and regulation compliance. It involves identifying and rectifying any issues before the ESS is fully operational. Maintenance, on the other hand, encompasses regular inspections, testing, and upkeep to prevent deterioration, detect potential problems early, and maintain the reliability and efficiency of the ESS over its lifespan. Both procedures are essential for maximizing the benefits and lifespan of ESS installations while minimizing risks and disruptions to energy supply.

In previous NEC versions, Section 706.7 outlined the requirements for performing maintenance on ESS systems, emphasizing the need for standardized procedures and thorough record-keeping. However, it did not specify whether commissioning was required before an ESS could be put into operation mode. In the 2023 version, section 706.7 underwent several modifications. First, a new subsection (A) was added to address the commissioning requirements for ESS installations. This subsection now mandates commissioning for all ESS applications except those installed in one- and two-family dwellings. Second, a new subsection (B) was introduced to cover the maintenance provisions from earlier versions, with a small addition exempting ESS installations in one- and two-family dwellings from requiring detailed documentation and maintenance procedures.

What’s New for the 2023 NEC?

The table below presents a comparison between the 2020 NEC and the 2023 NEC regarding Section 706.7.