2, every letterbox or other receptacle intended or used for the receipt or delivery of mail on any city delivery route, rural delivery route, highway contract route, or other mail route is designated an authorized depository for mail within the meaning of 18. Except as excluded by 1. This enclosure is where the main power feed from the utility company enters the house and is then divided into individual circuits that run to every outlet, light. Article 230 covers the installation requirements for service conductors and service equipment. A service consists of the conductors and equipment connecting the serving electric utility to the premises wiring system. It also contains the standards for curbside mailboxes. 22 and updated reference to IEEE C57. NEC Article 408 covers switchboards, switchgear, and Panelboards installation and applications.
