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In outdoor lighting installations, following the National Electrical Code (NEC) clearance requirements is essential for safety and compliance. The common voltage threshold of 120 volts serves as a reference point for many outdoor electrical systems. This voltage is significant because it falls within the standard range used for residential and commercial lighting applications.

Outdoor installations must account for various factors such as the potential for moisture, physical damage, and the need for proper grounding to protect both the equipment and the individuals who may come into contact with the lighting systems. The NEC establishes guidelines to ensure that installations maintain safe distances from other structures, electrical equipment, and areas where people may be present.

While other voltages like 100, 220, and 240 volts may be utilized in specific applications, 120 volts is the most prevalent for typical outdoor lighting setups, thus aligning with general industry practice and compliance with NEC requirements. This uniformity helps in maintaining safety standards and provides a clear understanding for electricians working on these installations.