Understanding NEC 230.71(B): Why Service Disconnects Changed After 2020

The “six disconnect rule” has been around for a long time in the electrical industry, and for years it allowed up to six service disconnects to be grouped together as a means of shutting down power to a building. Many older service installations were built around this concept, where multiple breakers or disconnect switches were installed in a single enclosure or shared space, all acting together as the service disconnecting means. While this approach was acceptable under previous versions of the code, the 2020 National Electrical Code introduced a key clarification that changed how these disconnects must be installed moving forward.

NEC 230.71(B) now requires that each service disconnect be installed in a way that provides clear separation. This does not eliminate the ability to have up to six disconnects, but it does change how they are physically arranged. Instead of grouping multiple disconnects together in one open section, each disconnect must now be located in its own enclosure, compartment, or clearly separated vertical section with barriers between them. The intent is to ensure that each disconnect is distinctly isolated, making it obvious what is being controlled and reducing any ambiguity when operating the equipment.

This change becomes much easier to understand when looking at real-world examples. In newer, code-compliant equipment, each disconnect is installed in its own dedicated space, often with physical dividers or separate compartments that isolate it from adjacent disconnects. In contrast, older installations often placed multiple disconnects within the same open section of a panel or meter center, without any physical separation between them. While those installations were compliant at the time, they do not meet current code requirements and cannot be replicated in new work or most upgrade scenarios.

The reason behind this change is rooted in safety and clarity. When disconnects are not separated, it can be difficult to quickly determine which disconnect controls which portion of the system, especially in emergency situations. There is also a higher risk of assuming power has been shut off when it has not. By requiring separation, the code improves visibility, reduces confusion, and creates a more standardized approach across different types of service equipment. Each disconnect becomes easier to identify, easier to operate, and more predictable for electricians, inspectors, and first responders.

This requirement commonly comes into play in multi-family services, meter banks, and larger residential or commercial service upgrades where multiple disconnects are still permitted. It is also one of the more frequent reasons that older service designs need to be updated when a property is being upgraded. Equipment that once met code may no longer be acceptable, not because the concept of multiple disconnects is gone, but because the way they are arranged no longer meets the separation requirement.

For property owners and contractors planning a service upgrade, this is an important detail to understand early in the design process. Attempting to replicate an older layout with grouped disconnects will typically lead to corrections during plan review or inspection. Modern service equipment is now designed with this code requirement in mind, and selecting the right gear from the beginning helps avoid delays, redesigns, and additional costs.

At Slazik Electric, service upgrades are approached with current code requirements as the baseline, not an afterthought. That means evaluating existing conditions, selecting equipment that meets today’s standards, and laying out the system in a way that is both clean and compliant. If you are working with an older service or planning an upgrade, understanding how NEC 230.71(B) applies to your project can make a significant difference in how smoothly the job moves from design to final inspection.