Frequently Asked Questions

Rashtriya Electrical & Engg. Corporation manufactures and supplies electrical equipment and components used across power distribution, transmission, substations, railways and industrial electrical applications. The product range includes polymer insulators, isolators, high-voltage fuse units, lightning and surge protection products, cable jointing kits, insulator fittings and hardware, FRP products, clamps and other electrical accessories.

Product specifications vary by voltage class, mechanical requirement, application and configuration. Buyers should check the relevant product page or contact the company with their complete technical requirement.

Depending on the product, our electrical equipment can be used in power distribution networks, transmission systems, substations, switchyards, overhead electrical lines, industrial electrical installations and railway-related applications.

The correct product should always be selected according to system voltage, current rating, mechanical load, installation environment and other technical requirements.

Products are organized into product groups, categories and individual product pages. You can first select the relevant product group, open its category and then compare the products available within that category.

Individual product pages provide technical specifications, images and other available information to help you shortlist the appropriate product.

If your exact requirement is not listed, contact us with your technical specifications.

Yes. You can contact Rashtriya Electrical by phone, WhatsApp or email for product-related enquiries.

For faster assistance, provide as much technical information as possible, such as:

Product availability can change according to manufacturing schedules, stock, specification and order quantity. Some website products may also show “NOT AVAILABLE” where a current price or commercial availability has not been confirmed.

For current availability, price and delivery information, send us the exact product name and required quantity before placing an order.

The polymer insulator range includes different types such as disc insulators, pin insulators, post insulators and line post insulators, depending on the product currently listed.

Polymer insulators are commonly used in overhead distribution, transmission and electrical equipment applications. Composite designs can combine an FRP core with silicone-rubber insulation housing and metal end fittings. Silicone housings are valued for their hydrophobic surface characteristics, while composite construction can provide a lightweight design with suitable mechanical performance.

Always select an insulator using the actual voltage, mechanical strength, creepage distance, end fitting and application requirements.

A polymer disc insulator is an insulating component used primarily where a conductor must be electrically isolated while also supporting mechanical load.

Depending on its design, it can be used in suspension or tension applications on overhead electrical systems. Important selection parameters may include rated voltage, system voltage, tensile strength, creepage distance, section length and end-fitting configuration.

Different products should not be treated as interchangeable simply because their voltage ratings are similar.

A polymer pin insulator supports and electrically isolates a conductor in an overhead distribution system. It is generally mounted using a pin-type arrangement rather than being suspended as a tension string.

When selecting a pin insulator, consider its system voltage, creepage distance, dry arcing distance, cantilever or mechanical rating, mounting arrangement and conductor/application requirements.

Use the specifications of the actual product rather than selecting it only by voltage.

A post insulator provides both electrical insulation and mechanical support for conductors or electrical equipment. Depending on the design, post insulators may be used for busbar support, outdoor electrical equipment, panel or substation applications, and overhead lines.

A line post insulator is specifically designed to support conductors on an overhead line. Line-post products typically specify properties such as creepage distance, dry arc distance and cantilever strength.

The required design depends on the installation and mechanical loading conditions.

An isolator, also called a disconnector or disconnect switch in many applications, is used to provide electrical isolation between sections of a power system.

It helps establish a disconnected condition for inspection, maintenance or system operation. Depending on the design, disconnectors may also be combined with an earthing switch. High-voltage switchgear designs commonly use disconnector and earthing-switch arrangements to provide isolation and maintenance earthing functions.

An isolator must be selected according to voltage, current, installation arrangement and operating requirements.

An isolator without an earth switch primarily provides electrical isolation between sections of the system.

An isolator with an earth switch additionally provides an arrangement for connecting the isolated side to earth under the intended operating procedure. This can be useful for maintenance and operational safety when used according to the electrical system's approved switching procedure.

The required configuration depends on the substation or installation design and should be specified at the enquiry stage.

Yes. A manual isolator is operated mechanically by an operator through the provided operating mechanism, while a motorized isolator uses a motor-operating mechanism for switching control.

The appropriate option depends on factors such as:

A drop-out fuse is an outdoor protective device commonly used on electrical distribution networks. During operation under certain fault conditions, the fuse element interrupts the circuit and the fuse carrier can move to a visibly open position.

Drop-out fuse applications can include protection of distribution lines or the primary side of distribution transformers, depending on the system design and product rating.

Voltage rating, current rating, interrupting requirements and system configuration must be checked before selection.

A horn-gap fuse unit is a high-voltage protection arrangement used in electrical distribution or outdoor installations according to system design.

It combines insulating support, conductive components and the required fuse/protective arrangement. The exact construction can vary considerably between products.

When making an enquiry, specify the rated voltage, system voltage, current requirement, insulator type, installation arrangement and quantity instead of requesting only a “horn-gap fuse”.

A surge arrester helps protect electrical equipment against temporary transient overvoltages caused by events such as lightning or switching operations. Surge arresters are commonly applied in distribution networks, substations, transformers, switchgear and cable systems according to system requirements.

The correct arrester must be selected according to the electrical system rather than simply matching the nominal voltage printed on another component.

A surge counter is used with surge-protection systems to record or indicate surge discharge events, depending on its design.

It can help maintenance or engineering teams monitor how often surge activity has occurred through an associated surge arrester.

A surge counter should be selected for compatibility with the intended arrester and installation arrangement.

The product range includes various insulator fittings, suspension and tension-related hardware, clamps and associated electrical line accessories, depending on the currently available products.

Because fittings must match the relevant insulator, conductor and mechanical arrangement, buyers should provide an existing drawing, required dimensions, fitting type or complete technical specification wherever possible.

Rated voltage is the voltage value assigned to the equipment for its intended electrical rating and application.

It should not automatically be treated as identical to every other voltage term shown in a specification. Depending on the equipment, you may also see values such as highest system voltage, rated insulation voltage, power-frequency withstand voltage or impulse withstand voltage.

Always compare like-for-like specifications when selecting electrical equipment.

Rated voltage identifies the nominal rating used to classify or specify the equipment, while highest system voltage refers to the maximum system voltage associated with the equipment or network classification.

For example, a product may be described by one nominal/rated voltage while its specification separately identifies the highest system voltage.

Do not substitute one value for another when preparing a technical purchase specification.

The current rating, expressed in amperes (A), indicates the electrical current level for which a particular product or component is rated under its specified conditions.

It is different from the voltage rating.

For equipment such as isolators or fuse arrangements, both voltage and current ratings can be important. A correct voltage rating does not automatically mean that the current rating is suitable.

Creepage distance is the shortest path along the surface of a solid insulating material between conductive parts.

It is an important insulation parameter because the insulator surface may be exposed to moisture, dust, pollution or other environmental contamination.

Required creepage distance depends on the equipment, voltage, insulating material, environmental conditions and applicable design requirements. Therefore, a larger number should not automatically be considered “better” without considering the complete application.

Outdoor insulators are exposed to environmental conditions such as dust, moisture, industrial contamination and, in some locations, salt or other pollution.

Surface contamination can influence insulation performance, which is why creepage distance and insulator profile are important parts of outdoor insulation design. Pollution conditions are a recognized consideration when selecting insulation for electrical systems.

Provide the required creepage distance if it is already specified by your utility, consultant or project engineer.

Dry arcing distance is broadly the shortest distance through air between the conductive end portions of an insulator under dry conditions.

It is different from creepage distance, which follows the insulating surface.

Both parameters may appear in an insulator specification because they describe different aspects of the insulation geometry.

Do not replace the specified dry arcing distance with creepage distance or vice versa.

kN means kilonewton, a unit of force.

In insulator specifications, a kN value may describe a mechanical rating such as tensile strength, specified mechanical load or cantilever strength, depending on the insulator type.

For example, a suspension/tension insulator may be associated with tensile loading, whereas a post or pin design may specify a cantilever-related mechanical requirement.

Always identify what the kN rating represents rather than comparing the number alone.

No.

Different insulator types experience different mechanical loading conditions.

A suspension or tension-type insulator may commonly be specified by a tensile mechanical rating, while a post or pin insulator may be selected using a cantilever or bending-related rating, depending on its design.

Therefore, a tensile-strength value should not be copied from one type of insulator into another product specification.

Cantilever strength describes an insulator's ability to withstand a specified mechanical force applied in a bending-type loading condition.

It is particularly relevant to post and line-post applications where the conductor or connected equipment can place sideways mechanical load on the insulator.

Actual required cantilever strength must be determined from the mechanical design of the installation.

Power-frequency withstand voltage indicates the dielectric ability of equipment to withstand a specified AC test voltage for a defined test duration.

It is used as part of insulation coordination and dielectric testing. It should not be confused with the normal operating voltage.

Power-frequency withstand and lightning-impulse withstand values describe different electrical stresses.

Lightning impulse withstand voltage represents the ability of electrical insulation to withstand a standardized high-voltage impulse intended to simulate transient overvoltage conditions such as those associated with lightning.

It is different from normal operating voltage and power-frequency withstand voltage.

Where a project specification includes an impulse-withstand requirement, provide that value during your enquiry.

End fittings are the metal connection components at the ends of a composite insulator. They provide the mechanical interface between the insulator and the line, structure or associated hardware.

Depending on the product, fitting arrangements can include configurations such as:

The insulating material affects electrical behaviour, mechanical construction, weight, environmental performance and installation considerations.

Composite/polymer insulators commonly use a combination of a fiberglass/FRP structural element, silicone-rubber housing and metallic fittings. Silicone housings can provide hydrophobic surface characteristics and composite construction can offer a relatively lightweight design.

Material alone, however, should never be the only basis for product selection.

Not necessarily.

Two products can have the same nominal voltage but differ in:

Start with the electrical and mechanical requirements of your installation.

Important information can include:

For an isolator enquiry, provide key information such as:

You can send your requirement even if the exact configuration is not displayed online.

Provide the complete technical specification, drawing, required quantity and application. The requirement can then be reviewed to determine whether the requested configuration can be supplied or manufactured.

Do not assume that an unlisted specification is available until it has been technically and commercially confirmed.

For a custom or non-standard requirement, provide as much information as possible, including:

Customer drawings and technical specifications can be submitted for review.

The company can evaluate the requested dimensions, configuration, electrical rating, mechanical requirement, material and quantity against manufacturing and commercial feasibility.

Final confirmation should always be obtained before treating a customer-specific configuration as approved for production.

Yes, photographs can be helpful—especially for replacement or matching enquiries.

However, a photograph alone may not reveal important electrical or mechanical specifications.

Where possible, also provide:

Check the relevant product page first and then contact Rashtriya Electrical for a current commercial quotation.

Pricing can depend on product configuration, specification, quantity, material requirement and current commercial conditions.

For an accurate quotation, send the product name or website link together with your required quantity and technical specification.

“NOT AVAILABLE” means that a confirmed website price is not currently displayed for that product.

It should not automatically be interpreted as meaning the product can never be supplied.

You may contact the company with the required specification and quantity to check current availability and commercial feasibility.

Refer to the pricing information displayed on the relevant product page or quotation.

Where the website or quotation states that GST is additional, the applicable GST is calculated separately from the base product price.

For purchase decisions, always follow the latest formal quotation because tax treatment and commercial details should be clearly confirmed before the order.

Send your enquiry by WhatsApp, phone or email with:

A website price may represent the currently displayed base product information, while a formal quotation can depend on factors such as:

Minimum order quantity can vary from one product to another.

Some standard products may be available in smaller quantities, while customer-specific or manufacturing-based products may require a different commercial quantity.

Send the required product and quantity to receive confirmation rather than assuming one MOQ applies to the entire product range.

Transportation, freight, courier or postal charges can depend on factors such as shipment weight, package dimensions, destination, transporter and dispatch method.

Where freight is quoted as extra, it can be charged according to the actual or agreed transportation arrangement.

Provide the delivery PIN code/city and required quantity when requesting a quotation so that dispatch requirements can be assessed more accurately.

Packing depends on the size, material, weight and fragility of the product.

Suitable packaging may include boxes, protective wrapping or other packing arrangements appropriate for transportation. Special packing requirements should be communicated before the quotation/order is finalized.

If your project requires a particular packing method, export packing or labeling standard, mention it in your enquiry.

Dispatch time depends on product availability, quantity, specification, manufacturing requirement and order status.

Delivery time after dispatch also depends on the transporter and destination.

Ask for the expected dispatch schedule when obtaining the formal quotation, especially for project-based or time-sensitive requirements.

Yes. International buyers, distributors, contractors and other business customers can send export enquiries with their product and technical requirements.

Please include the destination country, required quantity, specification, applicable standards or project requirements, and any documentation or packing needs.

Product availability, commercial terms, export feasibility, documentation and delivery arrangements should be confirmed separately for each enquiry.

Yes. EPC contractors, electrical contractors, distributors, procurement teams, utilities and bulk buyers can contact Rashtriya Electrical for product and commercial enquiries.

For project enquiries, provide an itemized requirement or BOQ along with technical specifications and quantities wherever possible.

This allows the requirement to be reviewed product by product rather than relying on a general price request.

An export enquiry should ideally include:

If you cannot find the required information in these FAQs, contact Rashtriya Electrical & Engg. Corporation directly by phone, WhatsApp or email.

For product enquiries, send the relevant product link together with your complete technical requirement and quantity.

Providing detailed specifications at the beginning helps the team understand your requirement and respond more efficiently.