Code Clarity: How Illumine-i's expertise averted a series of AHJ rejections

When it comes to solar design and installations, strict adherence to electrical codes is paramount to guarantee safe and efficient systems.

This case study delves into a particular scenario where meticulous attention to National Electrical Code (NEC) regulations proved crucial in maintaining compliance and quality in a series of solar projects.


Illumine-i operates nationwide, dedicated to delivering tailored and compliant solar solutions for installers and designers across the United States.

The case in point is a plan-set designed by Illumine-i for a leading installer operating in Texas, Louisiana and Arkansas. The client requested a modification in disconnect sizes for their smaller-scale projects, aiming to utilize 30A fused disconnects with #10 AWG conductors instead of the previously employed 60A fused disconnects.

Challenges Faced:

The request stemmed from a misunderstanding that as long as the Over-Current Protection Device (OCPD) was 30A or below, a 30A disconnect sufficed. However, this decision conflicted with NEC guidelines.

Addressing Compliance Concerns:

NEC 230.79 (D) mandates a minimum service disconnect rating of 60 amperes for Line Side Taps (LST), effectively creating new service disconnects. Additionally, NEC 230.42 (B) stipulates that conductors cannot be smaller than the rating of the service disconnecting means specified.

Source: Code Corner

Resolution and Client Education:

Recognizing the imperative nature of NEC compliance, our team re-evaluated the disconnect size, reverting to the industry-standard 60A disconnects when performing an LST. We engaged proactively with the client, explaining the NEC regulations and how this adjustment ensures code adherence, minimizes potential rejections during reviews and inspections, and upholds industry norms for safety and quality.

Key Takeaways:

Our experience highlights the significance of continual education, communication, and dedication to adherence, ensuring not just compliance but also the highest standards of safety and quality in solar installations.