Which type of armored cable is listed under UL 4 with permitted conductor sizes from 14 AWG to 1 AWG?

• A. MC
• B. AC
• C. HCF
• D. NM

Answer: (B)

The type of armored cable that is listed under UL 4 with permitted conductor sizes from 14 AWG to 1 AWG is AC cable, or Type AC (Armored Cable). Type AC cable is designed to provide protection for electrical conductors and is primarily used in both light and power applications. It is constructed with a flexible metal armor that enhances its durability and resistance to physical damage, making it suitable for use in locations where additional protection is necessary.

The size range of 14 AWG to 1 AWG specified under UL 4 aligns with the typical conductor sizes allowed for AC cable, indicating its versatility for various installations. This standard also defines aspects such as the construction and performance requirements of the cable, ensuring safety and reliability in electrical systems.

While MC (Metal Clad) cable, HCF (Health Care Facility) cable, and NM (Non-Metallic Sheathed Cable) have distinct applications and requirements, they do not fit the criteria defined by UL 4 in terms of the conductor sizes and specific construction methods that characterize AC cable.