This standard is concerned with terms and definitions used in electrical installations and utilization equipment installed or used within or on buildings, structures and other premises, including: – Conductors and equipment in electric-supply stations. – Overhead and underground electric-supply and communication lines. – Conductors that connect an installation to a supply of electricity. – Other outside conductors adjacent to the premises. It does not include: – Installations in ships, watercraft, railway rolling stock, aircraft or automotive vehicles. – Installations underground in mines. – Installations of railways for generation, transformation, transmission, or distribution of power used exclusively for operation of rolling stock or installations used exclusively for signaling and communication purposes