Fiberglass Reinforced Plastic (FRP) cable trays have become an essential component in various industries, It has a unique combination of strength, durability, and resistance to corrosion. Whether you&#;re working on a large industrial project or a commercial building, selecting the right type of FRP cable tray is very important for managing the cables.
We, Team FGPL, would like to present a comprehensive understanding of the different types of FRP cable trays and their applications, ensuring you make an informed decision for your specific needs.
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FRP cable trays
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cmelguet
(Electrical)
(OP)
16 Jun 13 11:2716 Jun 13 11:27
Hi, I am involve in a project where we are running several 3 phase circuits of 33 kV using single phase conductors arranged in a trefoil formation. The cables are installed on a FRP cable ladder which is no good as a grounding conductor. The circuits lengths is around m, and all of the circuits goes from the main substation GIS switchgear to transformers 33/4.16 kV unitsubstations located around the plant.
Question: NEC requires to run a grounding conductor with every circuit. Normally the cable ladder is good enough for this. Since in this case i have an FRP cable ladder what are my alternatives?. Should I run an aditional grounding conductor for each circuit?. I understand the grounding grid is not good enough as a grounding conductor, even if all the grounding grids of the plant are joined together.
Regards,
Cristian
Replies continue below
7anoter4
(Electrical)
16 Jun 13 14:5616 Jun 13 14:56
According to NEC 250.4 General Requirements for Grounding and Bonding. (B) Ungrounded Systems. (1) Grounding Electrical Equipment. you have to connect the equipment non-carrying current metallic parts to the local Grounding.
But according to (4) Path for Fault Current.:
"shall be installed in a manner that creates a low impedance
circuit from any point on the wiring system to
the electrical supply source to facilitate the operation of
overcurrent devices should a second ground fault from a
different phase occur on the wiring system. The earth shall
not be considered as an effective fault-current path."
you have to install a grounding conductor along 33 kV cable on the FRP cable tray.
The grounding conductor has to withstand the Line-to-Ground-to-Line short-circuit current.
I am not sure the metallic cable tray-even aluminum made-could withstand a medium voltage system short-circuit current. Aluminum cable tray is good only up to A.-a low voltage short-circuit, may be. See NEC Table 392.60(A)
cmelguet
(Electrical)
(OP)
16 Jun 13 15:3216 Jun 13 15:32
Thanks 7anoter4,
The 33 kV system is resistance grounded (600 A).
Another idea, the 33 kV cables installed in the cable ladder have a screen. Can i use the screen as a grounding conductor?. In this way i dont need to run a grounding cable along the FRP ladder.
Regards?
davidbeach
(Electrical)
16 Jun 13 16:3316 Jun 13 16:33
Generally the higher the voltage, the lower the fault current. 40kA is real easy to achieve at 480V, but rather rare in the 15kV range. Getting above 40kA at 115kV requires lots of sources.
7anoter4
(Electrical)
17 Jun 13 10:0717 Jun 13 10:07"If the cable assembly is suitably rated for the ground fault current and is of the concentric neutral type, the shield conductors shall be permitted as the equipment grounding conductor."NEC Table 250.122 for Rating or Setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, Conduit, Not Exceeding 600 A recommends 1 awg [83.69 kcmil] copper conductor cross section.See[for instance ] some concentric neutral cables:http://www.prysmianusa.com/energy/product-families...
In my opinion, it is permitted according to NEC art.250.190 Grounding of Equipment.(C) Equipment Grounding Conductor. (2) Shielded Cables.:"If the cable assembly is suitably rated for the ground fault current and is of the concentric neutral type, the shield conductors shall be permitted as the equipment grounding conductor."NEC Table 250.122 for Rating or Setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, Conduit, Not Exceeding 600 A recommends 1 awg [83.69 kcmil] copper conductor cross section.See[for instance ] some concentric neutral cables:
7anoter4
(Electrical)
17 Jun 13 13:2017 Jun 13 13:20
I have to mention since the shield is grounded at both ends the losses of circulating current induced in the shield requires cable derating. However, you can reduce this current by cross bonding and transposition.
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Why Choose FRP Cable Trays for Your Infrastructure Needs?
It is crucial to select the appropriate materials for your projects in the ever-changing world of industrial and infrastructural uses. One such substance that has become increasingly popular is Fiber Reinforced Plastic (FRP). Engineers and project managers in particular are starting to use FRP cable trays. Leading FRP cable tray manufacturer Chemitech Group is aware of how crucial these trays are to maintaining the effectiveness and security of your infrastructure. For cable management, FRP cable trays are the best option. Here's why.
1. Superior Corrosion Resistance
FRP cable trays offer outstanding corrosion resistance, which is one of the strongest arguments in favor of using them. FRP trays, in contrast to conventional metal trays, are resistant to rust and corrosion from moisture, abrasive chemicals, and severe weather. For sectors where exposure to corrosive materials is frequent, like chemical processing, wastewater treatment, and maritime applications, this makes them perfect.
2. Lightweight and High Strength
Impressive strength-to-weight ratios are provided by FRP cable trays. They are easier to handle and install without sacrificing strength because they are substantially lighter than their metal equivalents. In addition to saving labor costs and installation time, this lessens the structural strain on structures and support systems. FRP cable trays are strong and dependable due to their ability to support heavy cables and equipment despite being lightweight.
3. Electrical and Thermal Insulation
Any infrastructure project must prioritize safety, and FRP cable trays perform exceptionally well in this area. Because they are non-conductive, they offer superior electrical insulation, reducing the risk of short circuits and accidental electrocution. Furthermore, FRP material does not retain heat due to its low thermal conductivity. This characteristic improves the overall safety of your installation by lowering the possibility of overheating and associated fire threats.
4. Durability and Longevity
FRP cable trays are made with durability in mind. Their exceptional resilience to impact, UV rays, and environmental stresses guarantee a prolonged service life, even under the most severe circumstances. This durability minimizes the need for frequent repairs or replacements, which results in cheaper maintenance costs and less downtime.
5. Customizable and Versatile
Chemitech Group provides a variety of FRP cable tray designs to satisfy various project specifications. Depending on your requirements, our FRP cable trays can be made to seem like ladders, channels, or perforations. Because of its adaptability, FRP may be easily modified and adjusted on-site to ensure a perfect fit for any purpose. Furthermore, the material has unparalleled design freedom because it can be molded into intricate forms and sizes.
6. Cost-Effective Solution
FRP cable trays may need a larger initial investment than traditional materials, but over time, the advantages greatly exceed the disadvantages. Throughout the product's lifetime, the ease of installation and the decreased need for maintenance, repairs, and replacements lead to significant cost savings. Additionally, the exceptional functionality and dependability of FRP cable trays guarantee continuous operations, enhancing the overall profitability and efficiency of the project.
7. Environmental Benefits
In today's infrastructure developments, sustainability is becoming a higher emphasis. Because FRP cable trays are composed of recyclable materials and have a smaller environmental impact than conventional metal trays, they are an environmentally responsible option. Their extended lifespan and low maintenance needs also help to save resources and cut down on waste, making them compliant with environmental laws and green construction principles.
1. Superior Corrosion Resistance
FRP cable trays offer outstanding corrosion resistance, which is one of the strongest arguments in favor of using them. FRP trays, in contrast to conventional metal trays, are resistant to rust and corrosion from moisture, abrasive chemicals, and severe weather. For sectors where exposure to corrosive materials is frequent, like chemical processing, wastewater treatment, and maritime applications, this makes them perfect.
8. Fire Retardant Properties
In high-risk workplaces, in particular, safety requirements frequently require the use of fire-resistant materials. Tough fire safety standards are met by FRP cable trays, which come with fire-retardant qualities. Your infrastructure will be safe and in compliance with industry standards thanks to this function, which offers an extra layer of security.
9. Ease of Installation and Maintenance
FRP cable trays have components that are simple to assemble and modify on-site, making installation simple. Because they are lightweight, less large installation crews and heavy lifting equipment are required, which further lowers labor expenses. Moreover, maintenance is simple and infrequent due to the long-lasting and non-corrosive qualities of FRP, which lowers operating expenses.
Conclusion
Selecting the appropriate cable management solution is essential for maintaining the longevity, effectiveness, and safety of your infrastructure. Fiber-reinforced plastic (FRP) cable trays are a great option for a variety of industrial applications since they have several advantages. Fiber Reinforced Polymer (FRP) cable trays offer a dependable and economical solution that fulfills the requirements of contemporary infrastructure projects. These features include outstanding corrosion resistance, high strength, electrical insulation, and environmental sustainability.
We at Chemitech Group are dedicated to providing the best FRP cable trays possible, adhering to the strictest industry guidelines. Our knowledge and commitment to innovation guarantee that you get the best goods and services for your requirements. Please get in touch with us right now to find out more about how our FRP cable trays can improve your infrastructure projects.
Fiber reinforced polymer (FRP) cable trays are a type of cable management system that is becoming increasingly popular. They offer a number of advantages over traditional steel cable trays, including corrosion resistance, lightweight construction, and fire resistance.
Advantages of FRP Cable Trays
Corrosion resistance: FRP cable trays are made of a composite material that is resistant to corrosion from a variety of chemicals and environmental factors. This makes them ideal for applications in harsh environments, such as marine and industrial settings.
Lightweight construction: FRP cable trays are significantly lighter than steel cable trays. This makes them easier to install and move, and it can also save money on shipping costs.
Fire resistance: FRP cable trays are fire resistant and can help to protect cables from fire damage. This is an important consideration for applications in public buildings and other areas where fire safety is a concern.
Disadvantages of FRP Cable Trays
Cost: FRP cable trays are generally more expensive than steel cable trays. However, the cost savings associated with installation and maintenance can offset the initial investment.
Strength: FRP cable trays are not as strong as steel cable trays. This means that they may not be suitable for applications where high loads are expected.
Comparison with Steel Cable Trays
The table below provides a comparison of FRP and steel cable trays:
Feature
FRP
Steel
Material
Fiber reinforced polymer
Steel
Advantages
Corrosion resistance, lightweight construction, fire resistance
Strength, cost
Disadvantages
Cost, strength
Weight, corrosion
Conclusion
FRP cable trays offer a number of advantages over traditional steel cable trays. They are corrosion resistant, lightweight, and fire resistant. However, they are also more expensive and not as strong as steel cable trays. The best type of cable tray for a particular application will depend on the specific requirements of that application.
Additional Considerations
In addition to the factors discussed above, there are a few other considerations that should be taken into account when choosing between FRP and steel cable trays. These include:
Application: FRP cable trays are typically used in applications where corrosion resistance, lightweight construction, or fire resistance are important considerations. Steel cable trays are typically used in applications where strength or cost are important considerations.
Environment: FRP cable trays are more resistant to harsh environments than steel cable trays.
Maintenance: FRP cable trays require less maintenance than steel cable trays.
By carefully considering the factors that are important for a particular application, engineers can select the best type of cable tray for the job.
Are you interested in learning more about Frp Cable Tray? Contact us today to secure an expert consultation!