Code Change Summary: A new code section was added to require selective coordination for critical operations data systems.

A new code section requires selective coordination for overcurrent devices serving critical operations data systems.

A Critical Operations Data System is an information technology equipment system that requires continuous operation for reasons of public safety, emergency management, national security, or business continuity. Critical operations data systems are usually installed in vital infrastructure facilities that, if destroyed or incapacitated, would disrupt national security, the economy, public health or safety.

The new code language does not apply to the actual data cables but it does apply to any overcurrent devices that supply class 2 and 3 power sources which in turn, supply the data circuits.

In a critical operations data system, selective coordination is achieved when the circuit breaker supplying the line side of the patch panel clears a fault at the patch panel before the main breaker protecting the entire electrical panelboard does. This ensures that the remainder of the branch circuits in the same panel remain energized and other key circuits in the electrical system are still operational.

Below is a preview of the NEC^®.  See the actual NEC^® text at NFPA.ORG for the complete code section. Once there, click on the “free access” tab and select the applicable year of NFPA 70 (National Electrical code).