PESO Approval for Flameproof Panels: Complete Guide 2026

• The approval from PESO for flameproof panels is important for equipment that is used in areas where there is a risk of explosion according to Indian safety rules.

• The approval process depends on how the panel’s protected, how it is built, the test reports, if it is suitable for dangerous areas and other papers that support the application.

• People who make or bring in these panels can avoid delays by making sure they have drawings, official papers, technical details and information about the model before they submit their request.

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Introduction

A manufacturing company had finished most of its installation work when the project team found a problem. The control panels they chose for an area did not have the right documents for regulatory acceptance.

The control panels were well made. The manufacturer gave them drawings and test papers. The EPC contractor put them in according to the project plan.There was a big difference between control panels that are technically good and control panels that are approved for use in hazardous areas.

This difference can be very expensive.

For manufacturers a problem with approval can stop them from sending out the control panels or getting acceptance from customers. For people who import control panels it can cause problems when a certificate from another country does not match the rules in India. For EPC contractors a mismatch can mean they have to do the work when it is not easy to change the electrical equipment.

This is where getting approval from PESO for flameproof control panels becomes very important.

PESO or the Petroleum and Explosives Safety Organisation makes sure that safety rules are followed. These rules include the Petroleum Rules from 2002. PESO. Approves flameproof control panels and other special electrical equipment that will be used in hazardous areas with flammable gases or vapours.

The important thing to learn from this is simple: do not think of PESO approval as some papers to fill out after the control panel is made or installed. You should think about PESO approval when you are choosing the control panel, deciding how to get it certified and making the documents for PESO approval, for flameproof control panels.

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What Is PESO Approval for Flameproof Panels?

PESO Approval for flameproof panels is approval of electrical equipment that is meant for use in dangerous areas under the control of PESO. The approval process looks at the product’s details, the way it is protected, the tests that were done, the certification and any extra information that is needed.

PESOs own instructions say that electrical equipment used in areas covered by the Petroleum Rules must get approval from the Chief Controller of Explosives. PESO accepts ways of protection like flameproof, intrinsic safety and encapsulation for dangerous-area uses.

A flameproof panel usually has a kind of case and parts that are meant to stop an inside fire from causing a fire in the dangerous area around it.

That does not mean every metal electrical panel is a flameproof panel.

The case, the connections, the places where cables go in the parts, how it is built, the temperature behavior and the proof of certification are all important.

For someone who is buying or working as a project engineer the safer question is not:

“Is this panel called flameproof?”

The better question is:

“Does this exact panel setup have the Ex protection and proof for the dangerous area where it will be placed?”

Changing the way people think like this avoids problems, with following the rules.

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Is PESO Approval Mandatory for Flameproof Panels in India?

For devices used in dangerous places that are covered by the PESO rules permission is needed before the equipment is put to use or set up as required by the rules.

PESO says that electrical devices working in places under the Petroleum Rules must get permission from the Chief Controller of Explosives. PESO has also written about places like petroleum refineries, storage areas, service stations and other places connected to petroleum where approved electrical devices are needed.

The exact rules should be found out from:

• The place and the work being done
• Rules from PESO that’re relevant
• Classification of dangerous areas

Type of electrical device

• Method of protection
• Certification of the product
• Where it will be installed
• PESO approval rules

This is very important because the rules and the instructions can change.PESO gave rules for approving Ex Electrical Devices in March 2024 after changes to the Petroleum Rules, 2002.For projects planned in 2026 using a checklist from a blog or a vendors quote is not a good way to follow the rules.

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PESO Approval for Flameproof Panels: What Does PESO Check?

The current PESO standard operating procedure for Ex Electrical Apparatus lists requirements like test reports, valid certification, general assembly drawings, technical details, manufacturing facilities, trained workers and other supporting documents. For flameproof-type Ex equipment the procedure specifically mentions a BIS license or relevant IECEx documentation along with the proper test evidence.

Depending on the product and how it will be used the technical review can cover areas such as:

1. Protection technique

The panel must have an explained protection plan.A flameproof enclosure labeled with protection type “d” is not the same as a safe device labeled “i.”The documentation needs to explain the protection method.

2. Hazardous-area suitability

The area where the equipment is meant to work is important.PESO guidelines describe areas in terms of zones based on how likely and how long flammable gas or vapor might be present.An equipment meant for one type of area cannot automatically be considered safe for all hazardous locations.

3. Gas group

The gas group that the equipment is designed for must match the intended use.This is especially important for industries that deal with hydrocarbons, solvents, gases and chemical vapors.

4. Temperature classification

Surface temperature is a safety factor.The equipment’s temperature characteristics must be right for the environment it will work in.

5. Enclosure construction

For flameproof equipment the enclosure and its flameproof joints are central to the protection idea.BIS documentation for IS/IEC 60079-1 talks about requirements related to equipment protection using flameproof enclosures “d.”

6. Cable entries and accessories

Even a certified enclosure can cause a compliance issue if the cable entry setup, glands, plugs or other parts are not the same as the approved design.

7. Model and product identification

Model numbers, ratings, certificates and drawings should all match.A common problem is when the model number on the application is different from the one on the test report or when the product drawing shows a different setup.

That is the kind of mismatch that should be fixed before filing.

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What are the hazardous zones for flameproof panels?

To pick the panel you need to know about hazardous area classification.PESOs guidance on Ex-equipment says that

• Zone 0 is an area where you have gas or vapor all the time or most of the time or a lot of the time.

• Zone 1 is an area where you might have gas or vapor when everything is working normally.

• Zone 2 is an area where you probably will not have gas or vapor when everything is working normally but you might have it for a little while if something goes wrong.

The zone classification is important when you are choosing equipment.

For example if you are putting a control panel near a place where people handle petroleum products you need to talk about different rules than if you were putting a regular electrical panel in a normal office.

This is why you should start a project by figuring out the hazardous area classification of just asking someone for a flameproof panel.

You should think about flameproof panels and what kind of zones they are for because flameproof panels are important for safety.

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Which Standards Apply to Flameproof Panels?

For protection of flameproof enclosures the standard reference is IS/IEC 60079-1.This standard is important for flameproof enclosure protection.

BIS says that IS/IEC 60079 Part 1 is the standard for equipment protection by flameproof enclosures in atmospheres.We need to check the standard that applies to our product and the way we get it certified.The rules of PESO are very important here because they tell us what we need to do for Ex Electrical Apparatus.

For things made in India PESO says we need a test report from an Indian laboratory and a valid BIS licence for Ex Electrical Apparatus with flameproof protection.Sometimes we also need IECEx documents.So manufacturers should not just say they have an IEC certificate.

The certificate should be for the flameproof enclosure product we are making.It should be relevant to the flameproof enclosure product.

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Documents Needed for PESO Approval for Flameproof Panels

The list of documents you need can be different depending on if the equipment’s made in India or brought in from another country and what kind of product it is.The current PESO rules give us a place to start.

You will need some documents like:

• Online PESO application
• Information about the company that made the equipment
• Papers that show the company is registered to do business
• Tax information like PAN and GST
• A list of products the company makes
• Details about how the equipment works
• A simple drawing of how the parts fit
• Detailed drawings of the equipment
• A report that shows the equipment was tested
• A special licence from BIS
• An IECEx Certificate of Conformity if you need one
• An IECEx Quality Assessment Report summary, if you need one
• An IECEx Test Report if you need one
• Information about if the equipment’s safe to use in areas with hazardous materials
• Details about the area where the equipment will be used
• What kind of gas the equipment can handle
• How hot or cold the equipment can get
• Information about the factory where the equipment is made
• Details about the quality control process
• Information about the people who build and test the equipment
• Any promises or guarantees you need to make
• Papers that show you have permission to bring in equipment from another country if you need them

PESO says you need to give them information like how the equipment works, where it can be used, what kind of gas it can handle and how hot or cold it can get. They also want to know about the factory and the people who build and test the equipment.

Remember: use this list as a guide but make sure you check the PESO rules, for your specific equipment, Flameproof Panels.

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PESO Approval Process for Flameproof Panels

A simple approval process for Flameproof Panels looks like this.First you need to figure out if your panel really needs PESO approval.You do this by looking at a things:

• the type of product
• how it is protected
• where it will be used
• what zone it is for
• what kind of gas it can handle
• what temperature it can take
• who made it
• who imported it if that applies

if there are already test certificates for it.This helps you avoid mistakes when you apply.

Next you need to check the certificate.The certificate should match the product.

So you look at:

• the certificate number
• the product name
• the model
• what kind of gas it can handle
• what temperature it can take
• the enclosure
• the ratings
• who made it
• what standard it meets.

If these things do not match you need to fix the problem before you apply.Then you need to get the drawings ready.The drawings should show how the product is put together.PESO wants these drawings to be checked by the test laboratory.The drawings should clearly show what the product looks like as described in the test results.After that you need to get the manufacturing information ready.If you made the product in the country PESO wants to know about your factory, machines and how you control quality.This is especially important if you are asking for approval for your product.Once you have all the paperwork ready you can apply to PESO.PESO has a way of doing things and a way to apply online for electrical equipment that is safe to use in certain areas.If PESO asks you questions it does not mean they are saying no.You need to answer their questions clearly and give them proof if they need it.Finally if everything is okay you get the approval.This is not the end.You need to make sure that if you change the product later you do not just assume it is still approved.If you change the outside the parts, how the cables are connected the ratings how it is built or the certified parts you might need to get it checked again depending on what you changed.

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PESO Approval for Indian Manufacturers vs Importers

The approval route can differ depending on whether the panel is manufactured domestically or imported.

For Indian manufacturers

The manufacturer needs to demonstrate its technical and manufacturing capability.

The current PESO SOP asks for company documentation, test evidence, drawings, technical details, manufacturing facilities and technically trained personnel.

The practical challenge is usually product consistency.

If a manufacturer has ten variants of a panel, each with different components or enclosure dimensions, the certification strategy needs to reflect those differences properly.

For importers

Imported equipment creates another layer of responsibility.

An overseas certificate alone does not automatically answer the question of Indian regulatory acceptance.

The importer needs to establish:

• Who is the manufacturer?
• Who is the Indian applicant/representative?
• What certificate covers the product?
• Does the certificate match the model?
• Does the protection concept match the intended application?
• Is the documentation acceptable under the current PESO procedure?

This is where an experienced compliance review can save substantial time.

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Common Reasons PESO Approval Applications Get Delayed

In practice, many delays are not caused by the absence of a certificate. They happen because the documents do not agree with one another.

1. Model number mismatch

The application says Model A, while the test report says Model A1.That small difference can become a technical clarification.

2. Drawing mismatch

The certified enclosure and submitted drawing show different dimensions or component arrangements.

3. Wrong hazardous-area information

The application may not clearly state the intended zone, gas group or temperature class.

4. Outdated documentation

A company may reuse a document pack prepared years earlier even though PESO has revised its guidelines.

PESO issued revised Ex-electrical approval guidelines in 2024, and its current SOP provides updated documentation requirements.

5. Uncontrolled component changes

Replacing a certified gland, switch, terminal or other component without considering the effect on the certified configuration can create problems.

6. Incomplete imported-product documentation

Foreign manufacturers sometimes provide a certificate but not the supporting technical information needed for an Indian regulatory application.

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Flameproof Panel vs Ordinary Electrical Panel

The difference is not simply the thickness of the enclosure.

Feature	Ordinary Electrical Panel	Flameproof/Ex Panel
Intended environment	General industrial areas	Applicable hazardous areas
Explosion protection	Generally not designed for explosive atmospheres	Designed around a defined Ex protection concept
Certification	Depends on product	Specific Ex certification/approval requirements
Hazardous-zone suitability	Normally not intended	Must correspond to application
Gas group	Generally irrelevant	Important where applicable
Temperature class	General electrical design	Important for hazardous-area application
Enclosure/joints	Conventional enclosure	Protection concept may rely on certified flameproof construction
PESO relevance	Depends on application	Important where covered by PESO hazardous-area requirements

A common purchasing mistake is to compare two panels only on IP rating.

IP rating and explosion protection are not the same thing.

A panel can have a high ingress-protection rating and still not be an appropriate Ex panel.

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What Is the Role of BIS in Flameproof Panel Approval?

BIS and PESO should not be treated as interchangeable authorities.BIS develops and administers Indian Standards and conformity-assessment activities, while PESO is the regulatory authority responsible for the safety framework within its statutory jurisdiction.

For flameproof Ex equipment, BIS has published product material relating to IS/IEC 60079-1, which addresses equipment protection by flameproof enclosures “d.”

PESO’s current Ex-equipment SOP also refers to a valid BIS licence for flameproof-type Ex Electrical Apparatus, alongside the relevant test evidence, while recognising specified IECEx documentation in the applicable route.

So, when preparing a flameproof-panel application, check the current PESO requirement rather than assuming that either BIS or IECEx documentation by itself completes the process.

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How Much Does PESO Approval for Flameproof Panels Cost?

There is no reliable single “PESO flameproof panel certification price” that applies to every product.

The overall cost can depend on:

• Product category
• Number of models
• Testing requirements
• Existing test certificates
• BIS requirements
• IECEx documentation
• Laboratory charges
• Technical documentation
• Application complexity
• Imported vs indigenous product
• Professional consultancy charges
• Additional testing or corrections

The current PESO SOP lists a scrutiny fee of ₹2,000 per type/model/safety marking, with a maximum of five equipment entries with different test certificates in one online application, subject to the applicable procedure.That government scrutiny fee should not be confused with the total project cost.

Testing, certification, engineering documentation and professional support can represent separate costs.

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How Long Does PESO Approval for Flameproof Panels Take?

There is no sensible universal timeline.

The actual duration can depend on:

• Completeness of the application
• Quality of technical documentation
• Availability and validity of test reports
• Product complexity
• Queries raised by the authority
• Speed of applicant responses
• Testing requirements
• Whether the product is imported
• Whether additional clarification is required

A manufacturer with a complete, internally consistent technical file can be in a much better position than one that starts gathering documents only after an objection is received.The best way to shorten the process is usually not to “push the application”.It is to reduce avoidable questions before submission.

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How Diligence Certifications Can Help

For a manufacturer or importer, the difficult part is often not filling an online form.The difficult part is understanding whether the entire technical file tells one consistent story.

Diligence Certifications can support businesses with:

• PESO applicability assessment
• Technical document review
• Product and model verification
• Test certificate review
• Drawing/document coordination
• Application preparation
• PESO submission support
• Query and objection handling
• Compliance coordination
• Post-approval documentation support

For businesses dealing with several hazardous-area products, having one compliance team review the entire product family can be more efficient than preparing every application independently.

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Conclusion

For companies operating in oil and gas, chemicals, petroleum, paints, solvents, storage, processing and other hazardous environments, electrical equipment cannot be selected on appearance or ordinary electrical specifications alone.The panel must be suitable for the environment in which it will operate.PESO Approval for flameproof panels is therefore an important compliance consideration for applicable Ex electrical apparatus used in hazardous areas under PESO’s jurisdiction.

The strongest applications are built around consistency: the product, certificate, drawing, model number, protection method, hazardous-area classification and technical documents should all point to the same equipment.

If you are a manufacturer preparing a new flameproof panel, an importer bringing Ex panels into India, or an EPC contractor checking compliance before installation, it is worth reviewing the documentation before the project reaches the approval stage.

Diligence Certifications can help you assess the applicability, organise the technical documentation, coordinate the application and respond to regulatory queries. Contact the Diligence Certifications team for professional support with your PESO approval requirement.

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Frequently Asked Questions