What is the maximum spacing permitted for labels or markings on PV system raceways?

The maximum spacing permitted for labels or markings on photovoltaic (PV) system raceways is 10 feet. This requirement is critical for ensuring safety and proper identification of the electrical components in a PV solar installation. Labels and markings help technicians, emergency responders, and maintenance personnel quickly identify the nature of the electrical infrastructure they are dealing with.

By placing labels at regular intervals, specifically at a maximum of 10 feet, the NEC aims to reduce the risk of accidents or misinterpretations when working in proximity to the electrical components. This is particularly important in emergency situations when quick identification of electrical systems can significantly affect safety outcomes.

The 10-foot spacing guideline is intended to strike a balance between adequate visibility and practicality in a range of installation contexts, promoting better adherence to safety practices in the maintenance and operation of PV systems.