Otis Singleton
Cable trays are an essential component of cable management, which involves organising and protecting electrical or data cables. They are used to support and transport cables, providing a reliable, rigid, and durable structural system. Cable trays are a modern alternative to open wiring, electrical conduits, or wire ways and can be used for cable management in commercial, industrial, and residential buildings. They are especially useful when changes to a wiring system are anticipated, as new cables can be easily installed by laying them in the tray. Cable trays come in various materials, including steel, aluminium, galvanised steel, stainless steel, and fibreglass, each suitable for different environmental conditions and load requirements.
| Characteristics | Values |
|---|---|
| Definition | A cable tray system is used to support insulated electrical cables used for power distribution, control, and communication. |
| Use Case | 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. |
| Benefits | Cable trays are more affordable, versatile, and durable than other wiring methods. They also improve cable organisation, simplify wiring, and preserve the life of cables. |
| Types | Solid-bottom, ventilated, ladder, trough, wire mesh, channel, and more. |
| Materials | Galvanized steel, stainless steel, aluminium, glass-fiber reinforced plastic, and more. |
| Safety | Cable trays should adhere to fire resistance standards and be properly grounded to prevent electrical hazards. Regular housekeeping is important to prevent the accumulation of combustible dust and clutter. |
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What You'll Learn
Cable tray materials
Cable trays are used to support and organise electrical cables in various installations, such as commercial buildings, industrial facilities, and data centres. They are available in various materials, each with its own advantages and suitable applications.
One of the most common materials for cable trays is galvanized steel, which offers excellent durability and strength. Galvanized steel cable trays can be further classified into hot-dip galvanized (HDG) and pre-galvanized varieties. When galvanized trays are cut to length, the exposed surface is typically painted with a zinc-rich compound to protect the metal from corrosion.
Stainless steel is another popular option for cable trays, known for its corrosion resistance and durability. It is an excellent choice for low-temperature environments, as it maintains its strength and does not exhibit a ductile-to-brittle transition at low temperatures.
Aluminum is a lightweight and readily available material for cable trays. It is often used in environments with ambient temperatures (0°F to 100°F) and is suitable for various applications due to its versatility and affordability.
Fiberglass or glass-fibre reinforced plastic cable trays offer a combustible alternative to metal trays. While they can catch on fire, the use of fire retardants or fireproofing coatings can mitigate this issue.
Other materials used for cable trays include wire mesh, which provides a flexible and cost-effective solution, and PVC, which is commonly used in electrical conduit systems.
The choice of material for a cable tray depends on various factors, including the application, environment, temperature, and specific project requirements. Each material has unique properties that make it suitable for certain conditions, and careful consideration should be given to selecting the correct cable tray material for the intended use.
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Advantages of cable trays
Cable trays are invaluable for electricians and network engineers, offering a reliable method for managing small to large-scale wiring structures. They are a modern-day alternative to wire ways and electrical conduits, providing a rigid and durable structural system to accommodate all types of electric cables and wiring.
There are several advantages to using cable trays:
Cost-Effective
Cable trays are generally more affordable than other cable management systems, offering durability and ease of maintenance, which translates to lower long-term costs. They also simplify installation by providing pre-fabricated components that are easy to assemble, reducing installation time and costs.
Enhanced Cable Protection
Cable trays provide a solid base that shields cables from physical damage, making them suitable for environments with heavy machinery or potential mechanical impact. They also protect cables from dust, moisture, and other environmental contaminants, extending their lifespan.
Improved Safety
Cable trays neatly organise cables, minimising tripping hazards and reducing the risk of electrical fires, contributing to a safer work environment. They also help prevent electromagnetic and radio-frequency interference, which is crucial for maintaining the integrity of sensitive signal cables.
Ease of Maintenance
Cable trays allow for straightforward access to cables for maintenance, upgrades, or repairs, without disrupting the entire cable arrangement. They also make it easy to add or remove cables, providing flexibility to the cable management system.
Aesthetics and Durability
Solid bottom trays contribute to a cleaner and more organised appearance in visible installation areas. Cable trays are also highly durable, with various materials available to suit specific environmental and installation conditions, such as galvanised steel, stainless steel, aluminium, or glass-fiber reinforced plastic.
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Cable tray types
Cable trays are a modern alternative to wire ways and electrical conduits, providing a secure, cost-effective, and organised solution for supporting and protecting cable networks. They are used to manage large cable networks and are especially useful when changes to a wiring system are anticipated.
Cable trays can be classified based on their materials, styles, and surface treatment processes. Common materials used for cable trays include carbon steel, stainless steel, aluminium alloy, fiberglass (FRP), PVC, and galvanised steel.
Ladder Type Cable Trays
Ladder type cable trays, also known as cable ladders, are the most popular type of cable tray. They are typically made from galvanised steel for corrosion resistance, but stainless steel is also an option for harsher environments. The structure of ladder type cable trays consists of side rails with rungs, allowing cables to enter and exit flexibly and providing good ventilation and dissipation performance.
Perforated Cable Trays
Perforated cable trays feature a ventilated bottom with holes, providing excellent airflow to prevent cable overheating. They are commonly used for managing instrumental and power cables. Perforated cable trays offer improved ventilation and heat dissipation, allowing free air circulation and reducing the risk of cable overheating.
Solid Bottom Cable Trays
Solid bottom cable trays provide maximum protection for cables but require cutting the tray or using fittings to enter or exit cables. They are widely used for holding fibre optic cables and can support all kinds of cables and electric wires.
Channel Cable Trays
Channel cable trays have a small width and are used to support short-length drop cables, typically carrying one or two cables to nearby equipment. They are economical and durable, making them an excellent alternative to other cable protection methods.
Large-Span Cable Trays
Large-span cable trays are designed for applications requiring spans greater than 4 meters. They can accommodate large bundles of cables and provide good ventilation.
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Cable tray installation
Cable trays are an invaluable tool for electricians and engineers to manage large cable networks. They are used to support electrical cables for power distribution, control, and communication. Cable tray installation is a complex process that requires careful planning and consideration of various factors. Here is a comprehensive guide to cable tray installation:
Planning and Design
Before installing a cable tray, proper planning is essential. This includes calculations and considerations based on loading, support systems, cable/wire fill and spacing, conductor types, and securing of the cables. The National Electrical Code standard of the United States provides guidelines for cable tray installation, including the requirement for a rigid structural system to securely fasten or support cables. It is also important to choose the appropriate material for the cable tray, such as galvanized steel, stainless steel, aluminum, or glass-fiber reinforced plastic, depending on the specific application and environment.
Installation Process
The installation process of a cable tray involves placing the tray in the desired location, ensuring it is securely fastened and supported. The cables are then placed inside the tray, following the manufacturer's instructions and any relevant regulations. It is important to consider the direction and elevation changes of the tray, utilizing specialized cable tray fittings and accessories such as horizontal elbows to maintain cable support. For open cable tray installations, it is crucial to protect the exposed cables from potential damage by covering them as soon as possible.
Maintenance and Safety
While cable tray installations are considered low-maintenance, regular inspections and servicing by qualified personnel are recommended as part of routine maintenance. Safety is a critical aspect of cable tray installation, and it is important to never use cable trays as a walkway or support for people. Regular housekeeping is essential, especially in hard-to-reach places, to prevent the accumulation of combustible dust and clutter, reducing the risk of cable fires. Fire-retardant measures, such as fire-retardant cable jackets or fireproofing coatings, can also be employed to enhance safety.
Choosing the Right Cable Tray
Cable trays come in various types, including solid-bottom trays, ventilated trays, ladder trays, and channel trays. The choice of tray depends on the specific application and the type of cables being used. For example, lighter cable trays are more suitable for a large number of small cables, while large power cables may require support blocks to maintain spacing and prevent overheating. It is important to select a cable tray that is compatible with the cable types, provides adequate ventilation, and offers the necessary protection for the cables.
Future Considerations
When installing a cable tray, it is important to consider future expansions or additions. The support system should be designed to accommodate potential load increases due to additional cables or other applied loads. Adjustable features, such as elbows, can be useful for accommodating future changes or irregular shapes. Additionally, it is essential to follow relevant standards and guidelines, such as NEMA VE2, which provides valuable information on cable tray installation, maintenance, and system modification.
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Cable tray safety
Cable trays are used to support electrical cables for power distribution, control, and communication. They are an alternative to open wiring or electrical conduit systems and are commonly used for cable management in commercial, industrial, and residential buildings.
To ensure safety when using cable trays, it is important to follow these guidelines:
- Consult the Cable Tray Manufacturer's Installation and Use Instructions.
- Use cables and conductors that are approved for use in cable trays and ensure they are properly insulated.
- De-energize wiring if work on cable tray installations may expose workers to live parts or damage the insulation.
- Ensure grounding of cable tray systems to protect against arcing. Metallic cable trays can be used as equipment grounding conductors.
- Secure cables within the cable trays using appropriate cable ties to maintain proper spacing and prevent cables from falling out.
- Choose cable ties based on factors like length, temperature, moisture resistance, ultraviolet resistance, chemical resistance, flammability, low smoke characteristics, and strength.
- Avoid overloading cable trays, as this can lead to a breakdown of the tray and possible hazards such as electric shock and arc-flash/blast events.
- Use fire-retardant cable jackets or apply fireproofing coatings to installed cables to prevent cable fires.
- Regularly clean and inspect cable trays to remove combustible dust and clutter, especially in hard-to-reach places.
- Be aware that plastic and fiberglass-reinforced plastic cable trays are combustible and take appropriate fire mitigation measures.
- Use trays with perforated or ventilated designs to facilitate proper ventilation and prevent wire overheating.
- Use solid-bottom trays for maximum cable protection, but note that they may require cutting or fittings for cable entry and exit.
- Use lighter cable trays for a large number of small cables, such as telephone or computer network cables.
- Utilize specialized cable tray fittings, such as horizontal elbows, to maintain support at changes in elevation or direction of the tray.
- Choose the appropriate material for the cable tray based on the application, such as galvanized steel, stainless steel, aluminum, or glass-fiber reinforced plastic.
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Frequently asked questions
A cable tray is a mechanical support system that holds large networks of cables together. Cable trays are used as an alternative to open wiring or electrical conduit systems.
Cable trays are available in various materials, including steel, aluminium, galvanised steel, stainless steel, fiberglass, and glass-fiber reinforced plastic.
Cable trays are affordable, versatile, and durable. They also improve cable organisation, simplify the wiring system process, and preserve the life of the cables.
There are several types of cable trays, including solid-bottom trays, ladder trays, trough cable trays, and wire mesh cable trays.
In the US, cable trays must adhere to the National Electrical Code (NEC) guidelines. They may also need to comply with standards from organisations like the National Electrical Manufacturers Association (NEMA) and the Institute of Electrical and Electronics Engineers (IEEE). Additionally, fire resistance standards must be considered, especially in industrial settings.
