Your No. 1 Strain Clamp Manufacturer in China—Rayphen
We supply the best quality strain clamp for your benefit all across China and beyond.

Why Rayphen Strain Clamp

  • Strain Clamp for PT PLN
  • Strain Clamp for Vietnam EVN
  • Strain Clamp for South Africa Eskom
  • Strain Clamp for Sri Lanka CEB
  • Strain Clamp for Pakistan Nepra
  • Strain Clamp for Spain RED
  • Strain Clamp for Turkey TEIAŞ

Upgrade the Level of Your Business with Rayphen Strain Clamp

Rayphen presents a vast strain clamp for overhead line collection. Just check it out and order your favorite product.

NLL Strain Clamp with Insulation Cover
NLL Strain Clamp with Insulation Cover

NLL series of Rayphen strain clamp for transmission line comes with insulation covers for extra protection. The dead end strain clamp is aluminum made and preferable for overhead lines up to 35kV and above.

A Strain clamp with an insulation cover is ideal for all types of conductors. We can help you boom your business!

Bolted Aluminum Alloy Strain Clamp
Bolted Aluminum Alloy Strain Clamp

Based on different applications, Rayphen offers a series of bolted strain clamps. The aluminum quadrant strain clamp is highly weather-resistant and corrosion-free.

The hot-dip galvanized strain clamp provides clamping to ACSR, AAC, and AAAC for aerial lines. You can choose the right strain clamp according to your project.

Bolted NLD Malleable Iron Strain Clamp

Rayphen bolted NLD strain clamp series is manufactured by cast/malleable iron. A strain clamp is all in one clamp for overhead transmission line connections.

NLD series malleable iron strain clamp provides excellent support to conductors. You can order our range of strain clamp at a reasonable price.

More Details about Rayphen Overhead Line Fittings

Strain Clamp

Type

No.

Conductor Dia.(mm)Dimensions(mm)U BoltRated Failure Load(KN)Weight

(kg)

RCMQty(pc)Dia(mm)
NLL-1Φ5.0~15.58.019162M12400.85
NLL-2Φ8.2~17.09.022163M12701.5
NLL-3Φ11.4~20.010.024164M14702.74
NLL-4Φ13.6~25.012.530184M161003.96
NLL-5Φ16.0~32.016.036225M161205.65
NLL-6Φ28.5~46.523.550246M161209.0

Strain Clamp

TypeFor AACFor ACSRClamp range

(mm)

U BoltDimensions

(mm)

Rated

Failure

Load(kN)

insulating

cover

No.Dia.CM
NLL-19035-5035-50Φ7.6-16.52M1019.01440NLLZ-190
NLL-23095-15070-95Φ8.5-202M1223.01650NLLZ-230
NLL-285150-240120-150Φ11.4-232M1228.51660NLLZ-285
NLL-320240-300Φ12.7-26.52M1232.01660NLLZ-320
NLL-320J150-185Φ12.7-26.52M1232.01670NLLZ-320J
NLL-350240-300Φ13-302M1435.01680NLLZ-350

Strain Clamp

Catalog

No.

Conductor Dia.(mm)Dimensions(mm)U BoltRated Failure Load(KN)Weight

(kg)

L1L2RCMQty(pc)Dia(mm)
NLD-15.0~101501206.51816212201.3
NLD-210.0~142051308.01816312402.1
NLD-314.1~1831016011.02218416704.6
NLD-418.1~2341022012.52518416907.0

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Strain Clamp

Let Rayphen Your No 1. Partner of Your Business

Are you looking for the best suppliers of quadrant strain clamp in China? Rayphen is the solution to all your problems.

With hot-dip galvanized technology, Rayphen offers you a comprehensive range of affordable strain clamps for overhead line.

NLL, NLD, and bolted strain clamp by Rayphen elevate your business within no time as they offer reliability, weather resistance, and smooth connection.

Rayphen provides a dead end strain clamp with insulation covers for additional protection from dust and humidity, making the connection safe..

200 Clients Worldwide

Throughout the globe, Rayphen has 200+ clients of dead end strain clamp, and the number is increasing daily.

Best Raw Material

Rayphen believes in using the best raw material to produce strain clamp for overhead line for a smooth and fine finish.

Experience of 14 Years

Rayphen has strain clamp manufacturing experience of 14 years, which is quite evident in their products.

Meet Quality Control Standards

All the products and strain clamp at Rayphen is 100% in compliance with the quality control standards.

Rayphen Dead End Strain Clamp

A strain clamp is made for holding the tension of the attached conductors. Rayphen dead end strain clamp not only keeps the conductor in a fixed place but also protects them against environmental factors.

The fireproof Rayphen dead end clamp for overhead line provides maximum clamping action. This is because of the hot-dip galvanized aluminum and malleable iron body.

Rayphen bolted strain clamp for the transmission line is easy to install and uninstall. Such clamps work perfectly for all aluminum conductors, including AAC, ACSR, and AAAC.

A high-quality NLD quadrant strain clamp by Rayphen offers corrosion-free connections. It not only is perfect in its clamping action but also gives reliability.

Rayphen strain clamp for AB cable is made in accordance with quality control standards. Hence, it gives excellent holding results with perfection.

With strain clamp manufacturing experience of 14 years, Rayphen strain clamp presents corrosion-free quality features and pocket-friendly prices.

You can completely trust Rayphen as they are the No.1 strain clamp manufacture in China supplying top-notch strain clamp for aerial lines up to 35kV.

We at Rayphen use the finest raw material for manufacturing each piece of dead end clamp for overhead line with advanced technology and precision.

Rayphen supplies overhead fittings all over the world, including strain clamps, whether bolted, hydraulic, or compression clamps.

You can contact us if you want to get customized order of dead end strain clamp. We will deliver the product of your dream quite safely through safe packaging.

Also, if you want to get different quadrant strain clamp sizes, you can have them too. Rayphen makes the strain clamp using hot-dip galvanized aluminum alloy of the dimensions you have asked for.

Want an answer to the query related to strain clamp for the overhead line? Don’t worry. Rayphen customer’s care service is 24/7 available. Just ask away, and we will help you with your problem regarding the strain clamp for the overhead line.

Visit our website and have the best strain clamp shopping experience of your lifetime!

Strain Clamp FAQs- The Ultimate Guide

Electrical hardware fittings include different accessories, tools, and devices. These come in handy while establishing secure connections. One of this hardware is the Rayphen strain clamp. Clamps, as their name indicate, provide clamping to the conductors.

If you want to excel in your business or like to purchase strain clamps. But did not know anything related to strain clamp. You need not worry anymore. This guide will help you understand the basics of strain clamps. It includes every topic regarding structure, cost, manufacturing process, installation, and much more.

Here is everything you must know!

Q1. What is a Strain Clamp?                                    

A strain clamp is a hardware fitting that fixes the conductor to its place and also bears the tension or strain of the conductor.

Strain clamps are simple fittings making the electrical connections strong and unbreakable.

As the name indicates, the strain clamp has the strength to withstand the pressure of the load the conductor is transmitting.

Rayphen has a variety of strain clamps, including bolted strain clamps, NLL strain clamps, NLD malleable iron strain clamps, strain clamps with insulation covers, and strain clamps without insulation covers.

Strain Clamp                                                                             Figure 1 Strain Clamp

You can look for different strain clamps according to the size of the cable, whether earth wire or fiber optic cable.

These clamps come in various sizes.

The manufacturing material is of high quality.

Strain clamps are manufactured through hot dip galvanization technology.

the strain clamps made from aluminum alloy through low pressure casting method.

Q2. What are the Uses of Strain Clamp?

Strain clamp is no doubt one of the best hardware fitting providing reliable connections.

But let us tell you its uses.

They are suitable for distribution and overhead lines.

These are some of the uses of strain clamp.

  • Restrict Conductor Movement

It fixes the conductor to its designated position.

The grooves of the Rayphen strain clamp ensure motion restriction of the conductor.

That happens because of environmental conditions like rain and strong wind.

It holds the conductor to its place and ensures smooth, steady current flow.

  • Reliable Connection

Rayphen strain clamp makes the conductor connections safe and reliable.

The sharp edge cutting design of these strain clamps makes them important fittings to have found applications on distribution lines.

Every type of strain clamp performs reliable clamping action.

  • Safety to Conductor

A strain clamp not only gives a secure connection but also provides security to the conductors.

The nuts and bolts of the strain clamp are highly efficient in their working that they do not allow the conductor to let loose for a second.

It gives maximum safety to the conductor while it is on the overhead line.

Q3. What are the Characteristic Features of Strain Clamp?

A good quality Rayphen strain clamp has different characteristics to offer.

These characteristics are as follows.

  • Versatility

The strain clamp is versatile in its fittings as it can be used for different diameters of the cables.

You can get strain clamps suitable for different cable sizes.

  • Easy Installation

The good thing about strain clamps is that they are easy to install and mount.

You need simple tools for its installation, and the installation procedure itself is not complex.

  • High Strength

Strain clamps are made from strong materials, and they can withstand high breaking loads.

This made them perfect power fitting to use for overhead lines.

  • Resistant to Corrosion

A good strain clamp is always corrosion-free.

It prevents maximum corrosion between the stay wires and strain clamp.

Q4. What are the Parts of a Strain Clamp?

A strain clamp is not a single unit.

Though it seems like one actually, it has small parts in it.

These parts have an individual role.

Construction of Strain Clamp                                                         Figure 2 Construction of Strain Clamp

The small strain clamp components make it act like a unit performing its assigned role.

These parts are as follows.

  • Main Body

The main body of the Rayphen strain clamp is aluminum made.

It is the central part of the strain clap that provides the ground support to the cable and conductor.

  • Washers

The role of washers is to provide protection to the conductor surface once they get tightened up through strain clamp screws.

Washers are present adjacent to the main strain clamp body.

  • Inserts

As they are threaded, inserts are commonly known as a threaded bushing.

They act as strain clamp fasteners.

They insert a threaded hole into the attached conductor.

  • Nuts and Bolts

Like most of the devices, nuts and bolts are an essential part of the Rayphen strain clamp too.

They are responsible for the completion of connection among strain clamp, wire, or conductor.

Q5. What are the Functions of Strain Clamp?

The functions of strain clamp are quite evident.

Some of the functions that strain clamp performs are:

  • The strain clamp is manufactured for the purpose of holding, turning, and making terminal connections.
  • It provide protection to the conductor and fiber optic cables.
  • The strain fixes the wires and cables on poles and towers.
  • It attaches the conductor to insulation string of various towers.

Q6. What Materials are Used for Strain Clamp Manufacturing?

Manufacturing material plays a vital role in determining the quality of a product.

So is the case with strain clamp.

Selecting the appropriate manufacturing material guarantees good production.

On top of it, if the manufacturers use hot-dip galvanized technology to make the raw material, corrosion proof is considered the best.

Rayphen believes in quality strain clamp production according to customer’s demands.

The primary manufacturing materials for strain clamp are as under.

  • Aluminum and Aluminum Alloys

The most used strain clamp material is aluminum.

Because of its malleability and thermostability, it is best to use.

Aluminum alloys also make an excellent choice meeting all the requirements of production.

They are rigid and are contain minute impurities.

  • Malleable Iron

Iron makes an excellent choice when it comes to hardware fitting manufacturing.

Everyone knows the leading property of iron.

That is, it’s casting and molding into different shapes.

You can easily convert it into anything you like.

Hence, Rayphen malleable iron strain clamps can be your perfect choice if you are considering to buy them.

Bothe the manufacturing materials are selected on the basis of their hardness.

Temperature and weather changes have a minimum effect on them.

Q7. How Many Types of Strain Clamp are There?

The strain clamp fixes the wires (usually ground one) and conductors to insulators.

Or they can link other fittings to arms of towers.

There are basically two categories of strain clamps on the basis of installation procedure and structure.

  • Detachable Strain Clamp

The detachable strain clamps are those clamps having detachable components.

It includes wedge type strain clamp and bolted strain clamp.

Wedge Strain Clamp

Wedge strain clamps by Rayphen are seen at distribution lines and substations.

Wedge Strain Clamp                                                                  Figure 3 Wedge Strain Clamp

The question is why they are called wedge type?

The answer is they perform the clamping through wedge action.

It increases the tension of the loads, ultimately increasing the wedge motion longitudinally.

This overall has an increased effect on clamping and strength of strain clamp.

Wedge friction is reduced through lubrication.

The amount of friction results in a stronger grip.

Wedge strain clamp may come with a jumper connection or is without it.

Screws hold the wedge and body together.

Bolted/Quadrant Strain Clamp

These Rayphen strain clamps have a special bolt that needs tightening.

It put pressure on the conductor parts and wires.

So that they can be fixed to a point.

It helps in holding the conductor securely.

  • Non-detachable Strain Clamp

Non-detachable Rayphen strain clamp is those having non-detachable parts.

It includes compression strain clamps.

Compression/Hydraulic Strain Clamp

These clamps put enough compression while in contact with the conductor and the wire.

They generally take the tension of the conductor quite quickly and efficiently.

Compression Strain Clamp                                                              Figure 4 Compression Strain Clamp

Q8. How to Determine the Physical Interaction Between Strain Clamp and Conductor?

To be very precise, the design of a strain clamp is responsible for dictating the physical interaction between a strain clamp and overhead lines or conductors.

The design allows the clamp to freely come across the conductor.

Strain clamp design must not cause any fatigue or stress over the conductor surface.

Rayphen strain clamps come with a perfect design that is highly compatible with the conductors and wires.

They offer smooth working to the conductors.

Q9. Can You Use Strain Clamp for the Overhead Lines?

Yes, a strain clamp is ideal to use for overhead lines.

This includes utility lines, power transmission lines, Distribution lines..

Overhead lines are 8-18 feet high.

Rayphen bolted strain clamp perfectly fit the higher altitudes.

All types of strain clamps are applicable for this role.

They provide strong and reliable connections.

Q10. What is the Classification of the Strain Clamp on the Basis of Purpose?

On the basis of purpose, there are different categories of strain clamps.

These are the general ones.

  • Fiber Optic Strain Clamp
  • Wedge small tension strain clamps for ADSS
  • Strain clamp for OPGW
  • Double tension strain clamp for ADSS and OPGW
  • Medium tension strain clamp for ADSS
  • High tension strain clamp for ADSS

As evident, these strain clamps are for different cables and wires.

They are classified on the basis of their application and for which purpose, they are performing their role.

Q11. What Features to Look for Before Buying Strain Clamp?

Having prior knowledge before buying a strain clamp is essential.

But do you feel difficulty finding the best information regarding the strain clamp?

Or you don’t see any source on how to check whether you are getting the suitable clamp or not?

Well, we will tell you the key features to look at in the strain clamp before buying.

  • Design determines the physical interaction. Try to look for the appropriate design.
  • Manufacturing material must be high-quality.
  • Check the strain clamp and wire dimensions.
  • Quality control and standard compliance of the strain clamp.
  • The strength of the grip is achievable.

You can get all these good elements in Rayphen strain clamps.

You can buy them easily and use them for different applications, including significant power projects.

Q12. Is it Okay to Use a Strain Clamp for a High Voltage Line?

Yes, strain clamps are perfect for use on high voltage lines.

The hot-dip galvanization makes the Rayphen NLL bolted strain clamp an ideal fit for high voltage.

It not only bears the heavy current load but also protects the wire and cables.

It doesn’t mean that these strain clamps are not for low and medium voltage.

They are equally capable of performing their function in low and medium voltage as well.

NLL series strain clamp is suitable for voltage 10kV and higher values too.

Q13. How to Differentiate Between a Strain Clamp and Suspension Clamp?

Strain clamp and suspension clamp are different from each other.

Though both of them belong to line hardware fittings.

The shape and body structure of the suspension clamp is entirely different from the Rayphen strain clamp.

Suspension clamp                                                                     Figure 5 Suspension Clamp

It instead has a triangular body with nuts and bolts.

The function of a suspension clamp is to make a link between different overhead cables, and it keeps these cables fix to a particular position.

You have seen them suspended between different wires of an overhead line network.

Q14. What are the Design Specifications of Strain Clamp?

Design specifications vary from supplier to supplier.

It depends on which type of strain clamp is available.

Rayphen strain clamp is bolted and is a quadrant type.

It includes a clevis and all the fittings.

The numerical value of the angle of the groove is 60.

The main body is of high-quality aluminum or its alloy.

The strain clamp has steel bolts.

The clamp has 2 washers and 2 nuts (hex).

Every component is made by hot dip galvanized material.

Q15. Does Strain Clamp Come with Insulation Covers?

Yes, it is an advantage that strain clamp comes with insulation covers.

Strain Clamps with Insulation Covers                                                           Figure 6 Strain Clamp with Insulation Covers

Rayphen NLL series bolted strain clamps are available with insulator covers.

The addition of insulation covers is a good option as it is highly safe.

The leakage of current is also minimal.

The insulation cover has the power to withstand high voltage.

It can work efficiently at temperatures from -30°C to approximately 90°C.

Q16. Which Type of Conductors is Suitable for Strain Clamp Applications?

A strain clamp is suitable to use for all aluminum conductors AAC, including the aluminum alloy conductors AAAC.

It is best for aluminum conductors steel reinforced ACSR conductors.

You can very conveniently use Rayphen strain clamp for the overhead power lines.

All this is because the strain itself is made of aluminum and its alloys or cast iron.

All these manufacturing materials are good conductors of electricity.

It makes an excellent hardware fitting for every type of cable and conductors.

It is compatible with fiber optic cables as well.

Q17. Can You Buy a Corrosion Free Strain Clamp?

Yes, you can buy a corrosion-free strain clamp.

Strain clamps being corrosion-free saves a lot of electric current accidents.

Due to rains and humidity in the air, clamps get rust.

The bolts and nuts of the strain clamp are treated hot-dip galvanizing.

which can well inhibit rust. Guarantee the service life of the strain clamp.

Primarily, they are protected against accidents and are corrosion-free.

Q18. What is the Effect of Working Temperature on Accurate Strain Clamp Working?

The working temperature dictates that to which environment a specific strain clamp is suitable to perform its role.

The temperature of the strain clamp rises by lowering the torque of the bolt.

When you increase the bolt torque, it will ultimately decrease the strain clamp temperature.

This happens for the exact value of the current.

If the torque value is 20Nm, the temperature of the strain clamp will be more than the temperature of the wire.

It is an exciting thing to notice that the strain clamp does not overheat even at high temperatures.

This is mainly because of the clean contact between the conductor surface and strain clamp.

Moreover, the increase in strain clamp working temperature has a positive temperature effect on the wire.

The temperature of the wire also increases.

If the temperature becomes too high, it doesn’t allow the current to flow properly.

Q19. Can Strain Clamp Be Customized?

Yes, you can get custom-made strain clamps.

Rayphen offers customized markings with compliance with standard values.

You can get the strain clamps with custom identification symbols or marks.

The diameter range can also be customized for bulk orders.

Also, you can get customized strain clamps with different tensile strength values.

Q20. What is the Correct Way to Pack an Optical Cable Type Strain Clamp?

The correct packaging matters a lot for the safe delivery of the strain clamp.

The strain clamp must be packed safely in a carton or wooden case.

All the components of the strain clamp should be present inside the box.

You can also use a good quality sack for the safe delivery of strain clamp.

Q21. What is the ADSS Strain Clamp?

The Rayphen strain clamp used for ADSS cables is available for performing a high-end role.

ADSS cables are self-supporting.

They usually do not need any conducting materials attached to them.

Strain clamps are best to use with such cables as they will provide them a good connection with the other components of the transmission line.

Q22. How Can You Improve the Service Life of Strain Clamp?

Increasing the service life of strain clamp is a matter of great concern.

If you are investing money in a product and it lasts only for two to three months.

It has no worth at all.

It’s all a wastage of your money and time.

To keep the strain clamps safe and to increase their life, lubrication is essential.

Though they are made of fine quality materials, corrosion-free and waterproof.

Yet you need to take good care of the strain clamps.

Regularly checking up the overhead lines saves you.

The packaging must also be done carefully so that the parts don’t get damaged and produce a loose-fitting when combined.

This also affects the service life of strain clamps.

Q23. Can You Purchase Fireproof Strain Clamp?

Yes, you can buy a fireproof strain clamp.

Buying a Rayphen fireproof strain clamp is always wise.

Due to different climatic conditions, overheating, occasional high voltage transmission, and many other reasons, fires burst out at power lines or aerial lines.

To prevent this, using a fireproof clamp comes in handy as it can withstand high temperatures and voltages.

They do not get damaged in case of a more minor fire and do not explode to cause more significant damage.

Q24. During Installation of Strain Clamp, Which Conditions Need Attention?

Considering good conditions while installing a strain clamp is as essential as looking for its key features before buying.

Before installing, check the following.

  • The weather conditions
  • Torque of the strain clamp bolt
  • The right tools for installation

If you have the prior setting of installation, it will save your time and energy.

It is not considered safe to install if you see rainy weather.

Q25. What is the Clamping Range of Strain Clamp?

The clamping range of the Rayphen NLL series for ACSR conductors ranges from 16/2.5 to 120/20 mm.

For aluminum conductors, the clamping range is 16mm to 300mm.

The clamping range varies from model to model.

Strain clamps may have clamping range values other than the ones mentioned above.

Q26. Is Strain Clamp an Insulating Fitting?

Yes, the Rayphen strain clamp can be used as an insulation fitting.

Basically, it belongs to the category of power hardware fittings.

But they have found applications with insulated wires and cables.

Hence, a good quality insulation fitting as well.

Q27. How is Wedge Type Strain Clamp Made?

Rayphen wedge type strain clamp has two equally halved cover bodies.

They correspond perfectly to each other.

These two bodies make the outer covering of the strain clamp.

It has two clamp blocks that perfectly correspond.

They meet and create an internal block.

This block forms a cone-like shape.

It is fastened through threaded inserts.

The clamp block is lateral to the outer covering.

A pull rod is also present in the wedge strain clamp.

Each end of the pull rod is accompanied by noses.

The overall structure of the wedge type strain clamp is not complex.

Hence, it has an easy installation process.

And it is suitable for every type of wire application.

Q28. Can You Get Strain Clamps of Different Sizes?

Yes, you can buy Rayphen strain clamps of various sizes.

The dimensions can be increased or decreased according to your need.

You can choose strain clamps with 4 bolts, 3 bolts, 2 bolts, etc. as per your demand.

Q29. Can You Use Strain Clamp for Heavy Duty Areas?

Yes, you can definitely use a strain clamp for heavy-duty.

The aluminum and malleable iron-made strain clamps are robust and work efficiently for heavy-duty work.

Rayphen strain clamp can be used in different power projects on the commercial level without any hesitation.

These clamps prevent the damage of cable insulation as well.

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