Installation Standard for Type AC & Type MC Armored Cable


This standard covers the installation of Type AC and Type MC cables, which are used for electrical wiring for residential, commercial and industrial occupancies. It also includes information on fittings and other accessories necessary for a quality installation of these cable systems.

This standard is intended to enhance electrical safety by:

  1. Ensuring that the proper cable is selected for the installation.

  2. Describing proper installation methods for Type AC and MC cables.

  3. Aiding installers in meeting the “neat and workman like” requirements of the NEC.

  4. Creating an installation that will protect the wire conductors from mechanical abuse.

Table of Contents


1. Scope 

1.1 Regulatory and Other Requirements 

2. Glossary 

3. Identification of Cables

3.1 Identification

4. Armored Cable (Type AC)

4.1 Description 
4.2 Equipment Grounding 
4.3 Uses Permitted, General
4.4 Uses Not Permitted 
4.5 Connectors 

5. Metal-Clad Cables (Type MC) 

5.1 Description
5.2 Conductors 
5.3 Special MC Cable Configurations 
5.4 Equipment Grounding 
5.5 Uses Permitted
5.6 Uses Not Permitted
5.7 Connectors

6. General Installation Procedures

6.1 General Installation Procedures for Type AC and MC Cables
6.2 Installation of Homeruns
6.3 Cutting AC and MC Cables 
6.4 Position of Cable in Connector 
6.5 Overcurrent Protection and Derating 
6.6 Fishing Cables
6.7 Installing Cables Through Fire-Rated Walls, Floors or Ceilings

7. AC Cables—Specific Installation Procedures 

7.1 Boxes and Fittings 
7.2 Isolated Equipment Grounding 
7.3 Health Care Facilities

8. MC Cables—Specific Installation Procedures

8.1 Boxes and Fittings
8.2 Isolated Equipment Grounding
8.3 Health Care Facilities
8.4 Terminating Type MC Cable Containing Bare Aluminum Bonding/Grounding Conductor

9. Type MC Cables in Hazardous (Classified) Locations

9.1 Class I Locations
9.2 Class II Locations 
9.3 Seals in Hazardous (Classified) Locations

Annex A: Reference Standards