A bad case of "cable spaghetti"Cabling secured with cable ties
Cable management refers to management of electrical or optical cable in a cabinet or an installation. The term is used for products, workmanship or planning. Cables can easily become tangled, making them difficult to work with, sometimes resulting in devices accidentally becoming unplugged as one attempts to move a cable. Such cases are known as "cable spaghetti", and any kind of problem diagnosis and future updates to such enclosures could be very difficult.
Cable management both supports and contains cables during installation, and makes subsequent maintenance or changes to the cable system easier. Products such as cable trays, cable ladders, and cable baskets are used to support a cable through cabling routes.
Cable selection
The choice of cables is also important; for instance, ribbon cables used to connect Parallel ATA drives to the motherboard can disrupt the airflow inside of computers, making case fans less effective; most SATA cables are more compact and therefore do not have this problem.
Cable labeling
Color-coding of cables is sometimes used to keep track of which is which. For instance, the wires coming out of ATXpower supplies are color-coded by voltage.[1] Documenting and labeling cable runs, tying related cables together by cable ties, cable lacing, rubber bands or other means, running them through cable guides, and clipping or stapling them to walls are other common methods of keeping them organized. Above drop ceilings, hooks or trays are used to organize cables and protect them from electrical interference
Planning is especially crucial for cables such as thicknet that do not bend around corners easily and fiber optic which is very difficult to splice once cut.
Cable strain relief
Strain relief plate inside an electrical enclosure, mounted on a 35 mm DIN rail shape HStrain relief plate on the end of a cable carrier
With a strain relief component, the connection between a flexible electrical line and its connection port is protected against mechanical stress. Usually, the lines are fixed by clamping them into single cable clamps made of plastic or metal. Another possibility is to use so called cord grips which consist of weaved wire strands that put a grip around the cables.[3]
A more cable-friendly alternative is attaching the lines to special strain relief plates using common cable ties. In case of industrial applications these strain relief plates are also cost-effective because the packing density (meaning the possible number of lines to be fixed on one plate) is much higher than with common cable clamps which are normally designed for holding one single line.
Furthermore, most of the available cable clamps are not very flexible when it comes to routing lines with varying diameters. That causes higher acquisition and storage costs. The installation of the single cable clamps can take a lot of mounting time, depending on the laying length of the lines. Strain relief plates are therefore a more flexible solution which allows a parallel routing of several lines with varying diameters.
Strain relief is often required for terminated electrical lines that are plugged into sockets or ports to prevent unplugging or accidentally ripping out of the connector. At which point the lines have to be strain relieved depends on the application. For PROFINET, for example, which is used in automation it is recommended to set the strain relief component approx. 1 m / 3.5ft from the connection point.[4]
Strain relief components are also used in applications where cables, conduits and hoses are exposed to constant dynamic stress (cable carriers / drag chains).
Computer data cabling, structured cabling, LAN cabling
Generally, one end of a cable is terminated in the data cabinet. The other end of a cable ends at the desk. The cable management needs at either end are different.
Buildings and office furniture are often designed with cable management in mind; for instance, desks sometimes have holes to pass cables, and dropped ceilings, raised floors and in-floor cellular raceway systems provide easy access. Some cables have requirements for minimum bending radius or proximity to other cables, particularly power cables, to avoid crosstalk or interference. Power cables often need to be grouped separately and suitably apart from data cables, and only cross at right angles which minimizes electromagnetic interference.
The organized routing of cables inside the computer case allows for optimal airflow and cooling. Good cable management also makes working inside a computer much easier by providing safer hardware installation, repair, or removal. Some PC mod enthusiasts showcase the internal components of their systems with a window mod, which displays the aesthetics of internal cabling as well as the skills and wealth of the modder.
The IT industry needs data cables to be added, moved, or removed many times during the life of the installation. It is usual practice to install "fixed cables" between cabling closets or cabinets. These cables are contained in cable trays etc., and are terminated at each end onto patch panels in the communications cabinet or outlets at the desktop. The circuits are then interconnected to the final destination using patch cables.
Because large IT infrastructures often encompass vast networks of cables — all of which need to be serviced, removed, added, and so on throughout an installation lifecycle — cable planning is a necessity.
Different methods of cable planning may be employed, depending upon the level of detail required for proper management. Spreadsheet software can be used for this purpose, but there is often a need to visually organize information that goes beyond the capabilities of such general-purpose software. For proper visualization of cabling, companies may opt to use a cable management software package.
In hospitals
In hospital situations, cable management can be critical to preventing medical mistakes. In these settings, cable management includes tubes and hoses used for liquids and gases used in healthcare, along with electrical and other cables. Emergency room nurse manager Pat Gabriel said, "My wish is that we could somehow not have spaghetti on the bed. When you look at all those wires and those IVs, it's just spaghetti".[5]
Cabling in healthcare facilities must be grounded, shielded and routed in accordance with life safety codes to minimize interference with medical equipment.
In offices
Cables are managed by five methods in commercial buildings:
Concrete trenching - a trench is dug into the building's concrete. Cabling and floor boxes are installed and the trench is sealed with concrete.
Floor decking - cables are installed on the ceiling of the floor below. Holes are drilled through the floor and outlets are installed on top of the floor.
Overhead cabling - cables are installed on the ceiling. Cable drop downs give users access to outlets.
Access flooring - cables are installed below a raised floor.
In Floor Cellular Raceway Systems - utilize enclosed steel raceways located within a concrete floor slab to distribute power, data, and telecom cabling throughout a space to any location where these services are required today – and where they may be required in the future.
Cord concealers (also called cord protectors) are commonly used in offices to prevent accidents while protecting the cord and the appliance its attached to. Office furniture can sometimes have built in cable management solutions.
In moving equipment
Cable management is particularly important in powered equipment which must move large distances while tethered to a power source and control cabling. There are several common methods of cable management.
With a suspended sliding coil, the cables are coiled like a spring, with each loop of the coil attached to a sliding shoe on a track. As the cabling is paid out, the shoes slide individually along the track and the coils expand. When sliding the other direction, the coils fold back together into a compact spiral. This is also referred to as a festoon.
Folded linear cable uses either a flexible backbone shell, or a flat cable folded into an arc along its long axis. This style of cabling is very common in computer printers to connect the printhead to the circuitry, but is also used in very large linear moving gantries. The cables are flexed only in a small region in a tight radius and so need to be very flexible.
An electrical cable is an assembly of one or more wires running side by side or bundled, which is used as an electrical conductor to carry electric current.
Twisted pair cabling is a type of communications cable in which two conductors of a single circuit are twisted together for the purposes of improving electromagnetic compatibility. Compared to a single conductor or an untwisted balanced pair, a twisted pair reduces electromagnetic radiation from the pair and crosstalk between neighbouring pairs and improves rejection of external electromagnetic interference. It was invented by Alexander Graham Bell.
An electrician is a tradesperson specializing in electrical wiring of buildings, transmission lines, stationary machines, and related equipment. Electricians may be employed in the installation of new electrical components or the maintenance and repair of existing electrical infrastructure. Electricians may also specialize in wiring ships, airplanes, and other mobile platforms, as well as data and cable lines.
A power cord, line cord, or mains cable is an electrical cable that temporarily connects an appliance to the mains electricity supply via a wall socket or extension cord. The terms are generally used for cables using a power plug to connect to a single-phase alternating current power source at the local line voltage. The terms power cable, mains lead, flex or kettle lead are also used. A lamp cord is a light-weight, ungrounded, single-insulated two-wire cord used for small loads such as a table or floor lamp.
In electricity supply design, a ring circuit is an electrical wiring technique in which sockets and the distribution point are connected in a ring. It is contrasted with the usual radial circuit, in which sockets and the distribution point are connected in a line with the distribution point at one end.
Electrical wiring is an electrical installation of cabling and associated devices such as switches, distribution boards, sockets, and light fittings in a structure.
An extension cord (US), extension cable, power extender, drop cord, or extension lead (UK) is a length of flexible electrical power cable (flex) with a plug on one end and one or more sockets on the other end. The term usually refers to mains extensions but is also used to refer to extensions for other types of cabling. If the plug and power outlet are of different types, the term "adapter cord" may be used. Most extension cords range from around 2 to 30 feet in length although they are made up to 300 feet (91.44 m) in length.
A power cable is an electrical cable, an assembly of one or more electrical conductors, usually held together with an overall sheath. The assembly is used for transmission of electrical power. Power cables may be installed as permanent wiring within buildings, buried in the ground, run overhead, or exposed. Power cables that are bundled inside thermoplastic sheathing and that are intended to be run inside a building are known as NM-B.
An air line is a tube, or hose, that contains and carries a compressed air supply. In industrial usage, this may be used to inflate car or bicycle tyres or power tools worked by compressed air, for breathing apparatus in hazardous environments and to operate many other pneumatic systems.
A raised floor provides an elevated structural floor above a solid substrate to create a hidden void for the passage of mechanical and electrical services. Raised floors are widely used in modern office buildings, and in specialized areas such as command centers, Information technology data centers and computer rooms, where there is a requirement to route mechanical services and cables, wiring, and electrical supply. Such flooring can be installed at varying heights from 2 inches (51 mm) to heights above 4 feet (1.2 m) to suit services that may be accommodated beneath. Additional structural support and lighting are often provided when a floor is raised enough for a person to crawl or even walk beneath.
In electrical and electronic engineering, a current clamp, also known as current probe, is an electrical device with jaws which open to allow clamping around an electrical conductor. This allows measurement of the current in a conductor without the need to make physical contact with it, or to disconnect it for insertion through the probe.
An electrical junction box is an enclosure housing electrical connections. Junction boxes protect the electrical connections from the weather, as well as protecting people from accidental electric shocks.
In the electrical wiring of buildings, a cable tray system is used to support insulated electrical cables used for power distribution, control, and communication. Cable trays are used as an alternative to open wiring or electrical conduit systems, and are commonly used for cable management in commercial and industrial construction. They are especially useful in situations where changes to a wiring system are anticipated, since new cables can be installed by laying them in the tray, instead of pulling them through a pipe.
An electrical room is a technical room or space in a building dedicated to electrical equipment. Its size is usually proportional to the size of the building; large buildings may have a main electrical room and subsidiary electrical rooms. Electrical equipment may be for power distribution equipment, or for communications equipment.
A fan coil unit (FCU), also known as a Vertical Fan Coil Unit (VFCU), is a device consisting of a heat exchanger (coil) and a fan. FCUs are commonly used in HVAC systems of residential, commercial, and industrial buildings that use ducted split air conditioning or central plant cooling. FCUs are typically connected to ductwork and a thermostat to regulate the temperature of one or more spaces and to assist the main air handling unit for each space if used with chillers. The thermostat controls the fan speed and/or the flow of water or refrigerant to the heat exchanger using a control valve.
A cable gland is a device designed to attach and secure the end of an electrical cable to the equipment. A cable gland provides strain-relief and connects by a means suitable for the type and description of cable for which it is designed—including provision for making electrical connection to the armour or braid and lead or aluminium sheath of the cable, if any. Cable glands may also be used for sealing cables passing through bulkheads or gland plates. Cable glands are mostly used for cables with diameters between 1 mm and 75 mm.
Copper has been used in electrical wiring since the invention of the electromagnet and the telegraph in the 1820s. The invention of the telephone in 1876 created further demand for copper wire as an electrical conductor.
An electrical conduit is a tube used to protect and route electrical wiring in a building or structure. Electrical conduit may be made of metal, plastic, fiber, or fired clay. Most conduit is rigid, but flexible conduit is used for some purposes.
Electrical busbar systems are a modular approach to electrical wiring, where instead of a standard cable wiring to every single electrical device, the electrical devices are mounted onto an adapter which is directly fitted to a current carrying busbar. This modular approach is used in distribution boards, automation panels and other kinds of installation in an electrical enclosure.
↑ Smith, Robert L. (2004). Electrical Wiring Industrial: Based on the 2005 National Electric Code. Delmar. p.52. ISBN978-1401851545.
↑ Pigan, Raimond (2008). Automating with PROFINET: Industrial communication based on Industrial Ethernet. Publicis Publishing. p.389. ISBN978-3-89578-294-7.
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