What is the second most important specification division to the Electrical Worker after Division 16?

The second most important specification division to the Electrical Worker, following Division 16, is Division 15—Mechanical. This division covers aspects related to mechanical systems, which are closely interconnected with electrical systems in many projects.

Understanding Division 15 is crucial for an electrical worker because it outlines specifications for systems like heating, ventilation, air conditioning (HVAC), and plumbing—systems that often require electrical integration. The coordination between electrical and mechanical systems is essential for both safety and functionality in building designs, making it necessary for electrical workers to be familiar with these specifications.

The other divisions do not hold the same level of relevance. While Division 11 focuses on various types of equipment and Division 12 involves furnishings that may include electrical components, they do not emphasize the critical link between electrical systems and mechanical systems as strongly as Division 15 does. Division 10, which covers specialties, also lacks the direct connection to essential mechanical systems that are vital to the work of the electrical worker.