Code Change Summary: Many Chapter 3 wiring methods are now required to be listed.

A sweeping change has occurred requiring most wiring methods mentioned in Chapter 3 to be listed by a nationally recognized testing laboratory.

Many wiring methods in Chapter 3 were already required to be listed before the code change. In the 2017 NEC^®, many more are now required to be listed

Requiring product listing ensures wiring methods installed have been tested to the appropriate UL standard for safety. These changes occurred in:

• 320.6 Armored Cable: Type AC
• 322.6 Flat Cable Assemblies: Type FC
• 328.6 Medium Voltage Cable: Type MV
• 330.6 Metal-Clad Cable: Type MC
• 332.6 Mineral-Insulated, Metal-Sheathed Cable: Type MI
• 334.6 Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS
• 336.6 Power and Control Tray Cable: Type TC
• 338.6 Service-Entrance Cable: Types SE and USE
• 340.6 Underground Feeder and Branch-Circuit Cable: Type UF

Below is a preview of Article 320. See the actual NEC^® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2017 NEC^® edition of NFPA 70.