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Electrical Blog: Things To Consider When Rewiring A House - Types Of Wires - BX cable

BX cable, also known as armored cable or "BX," is a type of electrical wiring commonly used in residential, commercial, and industrial applications. It consists of a flexible metal sheath, usually made of aluminum or steel, surrounding insulated conductors. BX cable is highly versatile and provides a number of benefits in electrical installations. This article provides an overview of BX cable, including its features, installation guidelines, and safety considerations.

Features of BX Cable:

  1. Metal Sheath: The primary characteristic of BX cable is its metal sheath, which offers protection to the enclosed conductors. This sheath is usually made of interlocking metal strips, providing excellent durability and resistance to damage from impact, moisture, and rodents.

  2. Conductors: Inside the metal sheath, BX cable contains insulated conductors, typically made of copper. These conductors are color-coded for easy identification, and they transmit electrical current to power outlets, lighting fixtures, and other electrical devices.

  3. Flexibility: BX cable is designed with flexibility in mind, allowing it to be easily bent and routed through walls, ceilings, and conduits. This flexibility simplifies installation, especially in areas where rigid conduit or other types of cable may be impractical.

Installation Guidelines:

  1. Planning: Before installing BX cable, it's crucial to plan the routing and location of the cable to ensure compliance with local electrical codes. Determine the appropriate cable length, consider the voltage requirements, and calculate the electrical load to determine the correct gauge (thickness) of the cable.

  2. Tools and Materials: To install BX cable, gather the necessary tools, including wire cutters, wire strippers, and a screwdriver. Ensure you have the correct connectors, fittings, and clamps required for secure connections and proper grounding.

  3. Installation Steps: BX cable can be installed either exposed or concealed. For exposed installations, use appropriate clamps and secure the cable to the surface at regular intervals. When concealed, run the cable through walls or ceilings, protecting it from damage by using appropriate fasteners and avoiding sharp bends or tight corners.

Safety Considerations:

  1. Grounding: Proper grounding of BX cable is crucial for electrical safety. Follow local electrical codes and ensure that the metal sheath is electrically bonded to the grounding system of the building to minimize the risk of electrical shock.

  2. Overloading: Avoid overloading BX cable by calculating the total electrical load and ensuring the cable's gauge is adequate to handle the expected current. Overloading can cause overheating and potential fire hazards.

  3. Compatibility: Ensure BX cable is compatible with the intended application and environment. BX cable may not be suitable for direct burial or wet locations unless specifically designed for such conditions.

  4. Professional Installation: While BX cable installation can be tackled by experienced DIYers, it's often recommended to hire a licensed electrician for complex or large-scale projects. They have the expertise to ensure safe and compliant installations.


BX cable is a reliable and durable electrical wiring option commonly used in various residential, commercial, and industrial applications. Its metal sheath provides excellent protection to the enclosed conductors, making it resistant to damage and environmental hazards. By following proper installation guidelines and safety considerations, BX cable can be safely used to power electrical devices while ensuring compliance with electrical codes and regulations.

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