Eagle-eyed Metreel LinkedIn followers will know we recently worked on a project involving an Akapp multiconductor system, which keeps a travelling gantry crane operating smoothly. For this project, the curved, continuous copper system delivered reliable power for efficient roof-glass cleaning.
Whether you are specifying cabling for an industrial control system, a fire alarm installation or a commercial audio-visual setup, the chances are you will encounter multiconductor cable at some point. It is one of the most versatile cable formats in electrical engineering, yet the term is broad enough to cause confusion.
Allow the material handling and powerfeed experts here at Metreel to shed light.
In this article, we’ll explain what a multiconductor cable is, how it is constructed and the main applications it serves across different industries.
What Is A Multiconductor Cable?
A multiconductor cable is any cable containing two or more individually insulated conductors within a single outer jacket. Each conductor is electrically isolated from the others by its own insulation layer, allowing multiple independent signals or power circuits to be carried simultaneously through one cable run. In Europe, the terms multicore or multi-core are more commonly used to describe what is referred to elsewhere as multiconductor cable.
The number of conductors typically ranges from two to twenty-five, although cables designed for specific purposes can exceed that significantly. The conductors themselves are almost always copper, chosen for its electrical conductivity, flexibility and resistance to corrosion. Depending on the application, conductors may be solid or stranded and may be arranged in twisted pairs, triads or concentric layers to improve electrical performance and reduce signal interference between adjacent conductors.
The outer jacket material varies according to the operating environment. PVC is the most common choice for general-purpose installations, offering flexibility, moisture resistance and low cost. For more demanding environments, jacket materials such as polyurethane, thermoplastic rubber and cross-linked polyethene (XLPE) provide greater resistance to abrasion, chemicals, oils and extremes of temperature.
Shielded Vs Unshielded Multiconductor Cable
One of the most important distinctions when selecting multiconductor cable is whether shielding is required. Shielded multiconductor cable incorporates a layer of conductive material around the conductors, typically aluminium foil, braided copper or a combination of both, which prevents electromagnetic interference (EMI) from disrupting the signals carried within. Each shielded cable includes a drain wire that terminates and grounds the shield, improving its effectiveness.
Shielding is particularly important in industrial environments where motors, variable speed drives, welding equipment and other high-powered machinery generate electromagnetic fields that can corrupt low-voltage control and data signals running nearby. In situations where no significant EMI is present, an unshielded multiconductor cable is a more cost-effective choice and is easier and faster to install.
What Is A Multiconductor Cable Used For?
Multiconductor cable is used across an exceptionally wide range of applications. The following are the most common.
Industrial Control And Automation
In industrial settings, multiconductor cables are used for control systems, factory automation, process automation and machine tools. A single cable run can carry power to a device, a signal pair for a sensor and a further pair for a control output, all within one jacket. This simplifies installation, reduces the number of cable runs required and makes fault-finding significantly easier. Engineers, contractors and system integrators favour multiconductor cable because it reduces labour expense and on-site errors while eliminating pulling damage and speeding up installations.
Remote Signalling And Communications
Multiconductor cables are widely used for remote signalling, intercom systems, access control and building management applications. Typical installations include burglar alarms, intercom systems and cash registers, where the cable needs to be relatively thin and flexible to route easily through building fabric.
Fire Alarm Systems
Fire alarm cables are a specific category of multiconductor cable designed to maintain circuit integrity during a fire. They connect control panels, detectors, sounders and call points within a single integrated system and must comply with BS 5839 in the UK. The conductors are typically copper, selected for their ability to maintain conductivity under thermal stress and the cable construction must meet defined fire resistance classifications depending on the risk level of the installation.
Audio-Visual And Broadcast
In sound reinforcement and audio engineering, multiconductor cables are commonly referred to as snake cables and are used to transmit analogue audio signals between equipment, for example, connecting multiple microphones on stage to a mixing console. This is far more practical than running individual cables for each channel, which becomes difficult to manage and time-consuming to install.
Telecommunications And Data
In telecommunications, multiconductor cables are valued for their high bandwidth and low crosstalk, making them well suited to high-speed digital communications. Telephone systems, data centres and satellite installations all make use of multiconductor cable configurations.
Aerospace And Transit
In aerospace applications, multiconductor coaxial cables are used where cables must withstand severe heat, vibration and mechanical stress while carrying significant current loads. In transit applications, multiconductor cables are used for lighting, communications and other vehicle equipment.
How To Choose The Right Multiconductor Cable
Selecting the correct cable requires consideration of several factors. This includes the number of circuits required, the voltage and current ratings, the operating temperature range, the mechanical demands of the installation (including whether the cable will be subject to repeated flexing) and whether EMI shielding is necessary. Jacket material should be matched to the operating environment, with particular attention to chemical exposure, UV radiation and temperature extremes.
The conductor material, size and number are key specifications. Copper is the most widely used conductor material due to its excellent corrosion resistance and high thermal conductivity. Stranded conductors are generally preferable where the cable will be flexed repeatedly, as they are more resistant to fatigue failure than solid conductors.
In the UK, installations must comply with BS 7671 (the IET Wiring Regulations) where the cable forms part of a fixed electrical installation. For specialist applications such as fire alarm cabling or hazardous area installations, additional standards and certification requirements apply.
Metreel – Talk To Us About Your UK Powerfeed Or Material Handling Needs
So now you know what a multiconductor is, are you ready to explore our vast range of industrial powerfeed or material handling solutions?
On the Metreel website, you can browse our products, which we supply and install across the UK.
However, if you need any further help, you can also give us a call on 0115 932 7010 or send us a message and we’ll be with you shortly.