Preformed tension clamp also names preformed dead end or dead end cable grips which are used on communication ADSS fiber, OPGW cable, or OPPC.
The preformed dead end is one type of guy grip which has an important function on ADSS/OPGW transmission line. The dead end cable grips are designed to connect the ADSS/OPGW/OPPC to the overhead tower or pole.
The unique preformed tension clamp design not only simplifies the installation but also makes sure the safety of the cable connection. The dead end cable grips offer superior performance to protect the ADSS/OPGW/OPPC cable from damage by the stress point, against signal decreasing during the transmission.
The preformed tension clamp and guy wire dead end grips used on the conductor and earth wire look alike in shape, but there are really big differences in the specification, raw material, and strength requirement of the two types of guy grips.
While different countries have different design standards, we can do the OEM according to the customer’s requirements.
As an experienced preformed tension clamp manufacturer and supplier, QUAN PHAM knows the standard, and manufacturing process and knows your needs.
If you have any questions, feel free to contact us.
Table of Contents
- 1 Preformed Tension Clamp: The Complete Guide
- 2 What is a Preformed Tension Clamp?
- 3 Why You Need a Preformed Tension Clamp
- 4 Types of Preformed Tension Clamp
- 5 Technical Specification of Preformed Tension Clamp
- 6 Preformed Tension Clamp Manufacturing Process
- 7 Step-by-step Preformed Tension Clamp Installation Process
- 8 Frequently Asked Questions (FAQs)
- 9 Conclusion
Preformed Tension Clamp: The Complete Guide
Are you looking for a secure and robust installation for your power line cables?
If so, you are in the right place because the information in this article will broaden your scope of knowledge.
Stay tuned as we give you all the details you have ever wanted to know about the preformed tension clamps.
What is a Preformed Tension Clamp?
A preformed tension clamp is also known as dead-end cable grips or preformed dead end.
Preformed tension clamp
You will find it in everyday use on communication OPGW cables, ADSS fiber, or OPPC.
It is also an important part of OPGW/ADSS transmission lines.
OPGW fiber cable
The preformed tension clamp and the dead-end grips are similar in appearance but differ significantly in function and specifications.
Apart from that, you will be able to see the difference in the strength requirement and raw materials of the two devices.
The raw materials on the preformed tension clamp are galvanized steel wire or aluminum clad steel.
Manufacturers usually export the galvanized steel preformed tension clamp for use overseas.
Different countries have their rules and standards that govern the manufacture of preformed tension clamps.
This is the reason why many manufacturers are ready and willing to customize a preformed tension clamp for you.
Why You Need a Preformed Tension Clamp
The cable has a particular design and has many functions as listed below.
The dead-end cable grips have a unique design that connects OPGW/ADSS/OPPC to overhead poles or towers.
The preformed tension clamp simplifies this type of connection or installation and keeps the cable inside it safe.
It protects the OPGW/ADSS/OPPC cable from any form of damage caused by the stress points.
It also makes sure that the cable is not damaged and the signal does not disappear during the process of transmission.
Types of Preformed Tension Clamp
The span or the distance between the two towers or poles will determine the kind of preformed tension clamp to use.
Different types of preformed tension clamp
There are three main types of preformed tension clamps namely single grips, double grips, and big grip dead end.
The single grips and the double grips are in use on the ADSS cable.
a) Single Grips
Single grip preformed tension clamps are in everyday use on the ADSS cable.
In case the distance between the two towers or poles is less than 100 meters, single grips will be in use.
This is because it has enough strength to hold cables connected at a span of 100 meters and below.
b) Double Grips
You will also realize that double grips preformed tension clamps are also in everyday use on the ADSS cable.
In case the span or distance between the two poles or towers is more than 200 meters, then the double grip will be in use.
It has more strength than a single grip, and it will be able to sustain this kind of connection.
c) Big Grip Dead End
This type of preformed tension clamp is in use for connections that are over 800 meters long.
In simple terms, you will use it in contexts where the towers or poles are more than 800 meters apart.
It has an extreme grip strength that wraps the cables having big spaces.
The spacing is for the spreading of the main points of strength.
Technical Specification of Preformed Tension Clamp
Some of the key aspects to consider when evaluating preformed tension clamp:
In case you are interested in making an order for a custom-made preformed tension clamp, include the following aspects.
You will have to add the diameter of the cable, length of the cable, color mark, and number you will need.
Do not forget to mention the preferred weight of the preformed tension clamp.
The diameter is in millimeters, weight in kilograms, length in meters, and strength in kilo-newtons.
· Material Type
The type of material you will require varies according to your specifications.
The principal raw materials you can choose from are galvanized steel wire or aluminum clad steel. The material type will affect factors such as weight, thickness, and strength of the preformed tension clamp.
· Finish – hot-dip galvanization
Corrosion is one of the most significant problems affecting steel and aluminum appliances.
Manufacturers make sure that their products are corrosion resistant by passing it through the process of hot-dip galvanization.
Dipping the material in hot molten zinc makes it corrosion resistant and gives it a polished finish.
The thickness of the preformed tension clamp depends on the diameter and the type of material you choose.
In most cases, the thicker the device, the stronger it will be, and it will hold a lot of loads.
The design of the preformed tension clamp varies significantly according to the type of device you intend to use.
It will also change according to the kind of load and span between the two poles or towers.
This means that you will have a different shape and number of holes when choosing between the three types.
Single grip type will have fewer holes and a completely different design on the two ends as compared to the double grip.
The lock at the ends will also vary due to the kind of weight or load they will be handling.
· Tensile strength
The tensile strength of the preformed tension clamps varies according to the type of device you choose to use.
When selecting an apparatus for use, look at the weight or load it will be handling.
You will choose the big grip dead end if the load is huge and very far apart, usually more than 800 meters apart.
This is because of the more significant the preformed tension clamp, the higher the tensile strength.
The smaller the preformed tension clamp, the lower the tensile strength.
Preformed Tension Clamp Manufacturing Process
Manufacturing preformed tension clamps require the use of aluminum and galvanized steel as the raw materials.
Preformed tension clamp
You will cut the material in accordance to the diameter and the length which will be available to you.
You will need the assistance of an expert to make a perfect device and remember to follow the safety rules and regulations.
After that, you will put the pieces together, and with the help of a spinning machine, you will make the design.
The design will vary depending on the type of preformed tension clamp you are manufacturing.
The material you are using has to pass through the process of hot dip galvanization to make it resistant to corrosion.
You will bend the final piece at the center before packing it and sending it to the customers.
Step-by-step Preformed Tension Clamp Installation Process
The process of installing the preformed tension clamp is, but you will require an assistant to help you.
An expert will also make the work more comfortable for you even though you can follow instructions and install it personally.
Installation of preformed tension clamp
Remember to put on gloves and other safety clothing to protect your hands and increase the grip of your hands.
The materials required for this process include the preformed tension clamp and a cable of the right diameter.
You will place the cable into the clevises or holes on the preformed tension clamp all the way to the end.
Remember you will be setting it on one side of the preformed tension clamp only.
You will use the opposite of the device to cover the exposed areas of cable making sure that the cable is safe.
Lock the end of the preformed tension clamp to secure the cable inside.
The process of installation will vary greatly depending on the size and length of the cable and preformed tension clamp.
You will have to look at your setup and make the right decisions before doing the installation.
Frequently Asked Questions (FAQs)
What is the application of the preformed tension clamp?
The preformed tension clamp is designed to connect the ADSS/OPGW/OPPC to the overhead tower or pole.
What are the types of the preformed tension clamp?
According to the span of the two poles/towers, there are three types：
- The single grip: If the span is less than 100m， the single grip is enough strength to connect the ADSS cable.
- Double grips: You need to choose the double grips if the span is more than 200m.
- The big grip dead end: You should use the big grip dead end which wraps the cable with big space to spread the point strength when the span is more than 800m.
What is the raw material of the preformed tension clamp?
The preformed tension clamp raw materials are aluminum clad steel wire or galvanized steel wire.
Preformed tension clamps play a huge role in connecting cables that will cover very long distances.
Armed with this information, you can make the right decision on the kind of installation you will need.
Make an order for the type of preformed tension clamp you need so that you can have it custom-made specifically for you.
The preformed tension clamp raw materials are aluminium clad steel wire or galvanized steel wire. The galvanized steel wire preformed tension clamp is more popularly used on overseas.
For different cable diameters, the preformed tension clamp length, wire number, and colour mark are different. If you want to choose the right type which fits your cable specification, please check the specification table below.
|Product Specifications: Preformed tension clamp for ADSS
|Length of the inner grip