10 Things to Consider When Buying suspension clamp for fiber optic cable

How to Select Suspension Clamp – The Ultimate Guide

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Cable Suspension Clamp

Suspension Clamp Manufacturer

TTF Power manufactures and supplies suspension clamps for overhead power transmission and distribution systems. Suspension clamps for ABC cable protect conductors and other devices from aerial vibrations and swinging caused by strong winds and storms. Made from galvanized steel and aluminum alloy, these clamps resist corrosion from various environmental conditions, which enhances their durability and reduces maintenance and repair costs.

They are used alongside other devices such as bolts, nuts, and washers to ensure secure connections on overhead lines, thus minimizing loose connections that could lead to electrocution. For optimum performance, these additional components should be made from materials similar to the conductors to reduce abrasion and friction between different devices.

The design, mechanical, and technical attributes of the cable suspension clamps vary, affecting their functionality and operability. As a result, each type of suspension clamp is suited for specific applications within the installation of overhead transmission lines.

Components of Suspension Clamp

A suspension clamp is composed of several key components that connect to the conductors. These include:

• The body — The frame supporting the ADSS suspension clamp for the conductor, made of strong and corrosion-resistant aluminum alloy, ensuring the longevity of the OPGW suspension clamp.
• The keeper — Connects the conductor of the transmission line to the body of the helical suspension clamp.
• The strap — Transfers the load from the swaying axis directly to the insulator string. Made from zinc-coated material, the straps efficiently fulfill their purpose.
• Washers — Used when the clamping surface isn't vertical, providing support to the aluminum suspension clamp and the conductors. Made of steel to resist corrosion and rust.
• Bolts and nuts — Mechanically secure the connections when using fiber optic suspension clamps. Constructed from steel for enhanced strength and corrosion resistance.
• Threaded inserts — Fastening elements injected into components with threaded holes to complete the connection, made of stainless steel to prevent corrosion and rust.

Types of Suspension Clamps

Suspension clamps for ADSS cables are manufactured in various designs and models, each tailored for specific roles in transmission lines. Selecting the appropriate type for your needs is crucial. Here are some commonly used suspension clamps:

• Suspension clamp for ADSS cable
• Suspension clamp for ABC cable
• Suspension clamp for OPGW cable
• AGS suspension clamp
• Preformed suspension clamp
• Double suspension clamp
• Suspension clamp for HT & LT cable
• Cable suspension clamp u-type

Design of Suspension Clamps

The design and mechanical and technical requirements of ADSS suspension clamps are essential for their functionality in transmission lines. A well-designed OPGW suspension clamp ensures smooth coordination between the cable and other components. Key design considerations include:

1. Bolts and nuts — Should be compatible with the ABC suspension clamps during construction, made from similar materials as the conductors.
2. Design of straps — Round-shaped and sized to match the trunnion's dimensions.
3. Anchor clamp — Should facilitate free movement of the conductor and be integrated into the body's trunnion.
4. Conductor supporting groove — Must be measured accurately for the application. The fiber optic suspension clamp's keeper should be free of sharp edges.

Uses of Suspension Clamps on Transmission Lines

Suspension clamps primarily suspend conductors from transmission lines, ensuring safer connections. They also serve other important purposes:

• Hanging and suspending conductors.
• Protecting the conductor during transmission line installations on poles.
• Use on electrical pole overhead lines and telephone transmission lines.
• Providing mechanical support by ensuring proper hold on transmission lines.
• Controlling cable movement against external forces like wind and storms.

Factors to Consider When Purchasing Suspension Clamps

Selecting the right suspension clamp for your overhead transmission can be challenging. Consider the following factors to make an informed decision:

1. The purpose of the suspension clamp — Different clamps serve different functions, so knowing your intended application is crucial.
2. The material used — Galvanized steel, stainless steel, or aluminum alloy are ideal materials for resistance to corrosion and abrasion.
3. Mechanical and tensile strength — Necessary for supporting the conductor's weight effectively.
4. Compatibility with other fittings like bolts and nuts — Important for secure connections.
5. The manufacturer — Different manufacturers specialize in various transmission products.

Different Suspension Clamps Available in the Market

TTF Power Systems in China manufactures various suspension clamps, each designed for specific purposes in transmission line constructions, including:

• Aluminum trunnion suspension clamp — Used on standard voltage power lines, compatible with horizontal or vertical post insulators.
• Bolted aluminum suspension clamp — Used to suspend or hang cables or conductors on utility poles for extra protection.
• Bolted aluminum trunnion suspension clamp — An improved conductor support and protection system using bolts and nuts, with a body made from aluminum alloy.
• Double helical cushion suspension assembly — Designed for standard voltage applications with all aluminum, ACSR, ACSS, or aluminum alloy conductors, made from aluminum alloy to resist corrosion.
• Double shield wire suspension clamp — Designed for standard voltage applications and aluminum alloy conductors, with a body made from aluminum alloy.
• Ground wire suspension clamp — Used as ground wires with galvanized steel cable, with components made from various materials.
• Hot line hold down shackle — Suitable for both transmission and distribution lines, made from galvanized ductile iron or forged steel.
• Standard voltage suspension clamp — An electrical power line fitting used to suspend or hang cables and conductors on poles. Made from aluminum alloy to resist corrosion.

FAQs

What is a suspension clamp?

Suspension clamps are used in overhead transmission lines to suspend or hang cables, providing protection to conductors by minimizing swinging from strong winds and storms.

What are some types of suspension clamps?

Various types of suspension clamps serve different functions in transmission line construction, including:

• Suspension clamp for ADSS cable
• Suspension clamp for ABC cable
• Suspension clamp for OPGW
• Double suspension clamp
• Preformed suspension clamp
• AGS suspension clamp
• Cable suspension clamp u-type

What materials are used to make the suspension clamps?

Suspension clamps are made from galvanized steel, which resists corrosion, abrasion, and rust, leading to prolonged life and reduced maintenance and repair costs.

What fittings can be used with the suspension clamps?

Suspension clamps can be used with bolts, nuts, and washers to secure connections between conductors and other devices in overhead transmission lines.

What are the features of a suspension clamp?

Suspension clamps should protect cables and be easy and quick to install.

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Why are suspension clamps used?

Suspension clamps provide necessary mechanical support, irrespective of conductor conditions, and help regulate and reduce conductor movement during strong winds and storms.

What is the main factor to consider when purchasing a suspension clamp?

The design and material should fit the intended purpose, and the manufacturer's reputation should also be considered.

How to Choose an Optic Fiber Cable

To procure the desired fiber-optic cable model, one must consider various factors such as application, installation, and signal specifications. Engineering calculations are essential for selecting a product that suits specific conditions, and fiber-optic line installations always follow a thorough project evaluation. Whether for the Internet, telephone lines, or telemetry data transmission, the choice should align with design documentation.

It's important to note that laying fiber-optic cables and computing the line requires specialized knowledge, skills, and tools, so consulting with an expert when purchasing a cable is crucial.

Cable Selection Based on Network Type
Optical cables are utilized across all communication networks:

• International
• Long distance
• Urban
• Rural
• Subscriber
• Local

Hence, their transmission parameters, reliability, and cost efficiency should suit the network type and the equipment used in information transmission systems.

Access Network
For transport networks (interoffice), where information flows between communication nodes (CS), high broadband and network reliability are essential. Conversely, for access networks that provide information to subscribers (cable TV networks, optical Ethernet, passive optical networks - PON), factors like cost-effectiveness, flexibility, compact size and weight, protection against accidental damage, and ease of installation are crucial.

We'll focus more on optical cables for access networks because they feature diverse cable types, and the design and installation often involve specialists from various technical fields.

The choice of optical cable design largely depends on the network section in which it will be used and the placement conditions (e.g., in cable ducts, suspended on supports, indoors).

Varieties
Models of optical conductors can be categorized based on:

• Number of modes transmitted along a thread
• Application and installation method
• Number of fibers

The Quality of Fibers in Optical Cables
Based on the required optical fibers, different types of cables include:

• FTTH - 1-2-4 optical fibers
• UT - 4 to 8 optical fibers, or 8-12 (possibly 12-24-48)
• LT - 12-24 fibers, or more (possibly 8-12)

Optical fibers are also categorized into multimode (MM) and single-mode (SM), differing by light guide core diameter. Each type got its name based on radiation propagation. Fiber consists of a core and sheath with varied refractive indices. Single-mode fibers have a core diameter of about 8-10 microns, facilitating single-beam propagation. Multimode fibers have a light guide conductor of about 50-60 μm, allowing multiple beam modes.

Fiber quantity impacts the network’s conductivity and geometry. A single fiber can send and receive data, while data exchange between two fibers is also possible. Cable types depend on network location: trunk spans may need cables with 24 or more fibers, distribution spans could do with eight, and subscriber spans usually need one to four fibers.

A vital consideration is fiber stock availability, typically specified per situation. For trunk sections, 30-50% of fibers are spare; for distribution, 15-20% spare is typical; subscriber sections often don’t require spares.

Cables are classified by installation location as internal or external. An external-use conductor might also be suitable indoors, sometimes termed "universal."

Fiber Count
Optical fiber costs hinge on various parameters including fiber material, bundling method, functionality, manufacturer’s brand, and other properties.

Choosing Fiber Count
The number of fibers depends on the number of transceiver nodes and the network diagram. For instance, signals might be received and sent using two different fibers or one (commonly in PON). Creating a broadcast network might only require one fiber for one-way transmission.

Consider fiber suppleness for network expansion. For example, backbone sections of access networks often have 20-50% spare fibers, distribution sections have 10-20%, while small subscriber sections usually don't have a spare provision, as additional low-fiber cables can be added easily. The fiber count in each section should be determined by specific network design needs.

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