Type AC armored cable is governed by which UL standard?

Type AC armored cable is primarily governed by UL 4, which outlines the safety standards and performance requirements for this type of cable. UL 4 specifies the construction criteria, testing methods, and other essential aspects that ensure the cable can safely withstand environmental conditions and comply with electrical safety regulations. This standard is important because Type AC cable, also known as "BX" cable, is frequently used in residential and commercial wiring applications, providing a balance of flexibility, durability, and mechanical protection. Understanding the appropriate UL standard is crucial for electrical professionals to ensure compliance and safety in installations.