A DSEAR verification inspection is an independent check confirming that all electrical and non electrical installations in hazardous areas comply with DSEAR and IEC 60079 requirements. It verifies that explosion protection measures have been correctly designed, installed, and documented before first use.

Verification is required before a new or modified installation is brought into service in a hazardous area. It should also be repeated if there have been major equipment changes, layout modifications, or system upgrades affecting explosion safety.

Only competent personnel with hazardous area expertise in the field of explosion protection should conduct the verification. They must be independent of the original design or installation team to ensure objectivity.

A verification involves:

• Review of hazardous area classification drawings and DSEAR assessments.
• Review of design and equipment documentation.
• Review of competency of persons involved in design, installation and inspection.
• Review of initial inspection records for consistency with the installation.
• Confirmation that installed equipment matches design documentation and inspection records.
• Review of commissioning records to ensure all control measures are effective prior to operation.
• Review on site signage and emergency arrangements.
• Verification report and compliance certificate where applicable.

For a typical process area or small facility, verification takes one to two weeks depending on complexity, documentation quality, and accessibility of equipment. Larger COMAH or multi-plant sites and installations may require phased verification.

Any non-compliance findings are documented with clear corrective actions. Ecfio provides practical recommendations and can support remediation or re-inspection to close out findings before regulator or insurer review.

Yes. Regulation 7(4) of DSEAR requires “verification of the overall explosion safety of the workplace before it is used for the first time.” It is a legal requirement and a key part of demonstrating compliance with the ATEX framework.

• DSEAR risk assessment and HAC drawings
• Equipment schedules and Ex certificates.
• Inspection records Electrical and mechanical installation drawings
• Operating and maintenance procedures

Yes. Most battery technologies can release explosive gases during charging, so DSEAR applies to the assessment of these risks.

Yes. We provide recommendations on ventilation, detection, interlocks, and other protective measures as part of the assessment.

A structured evaluation of how well an organisation meets DSEAR requirements, focusing on documentation gaps, zoning accuracy, and control measures.

A Gap Analysis identifies missing or outdated elements but does not replace a full assessment. It helps determine what additional work is required.

HSE L138, IEC 60079‑10‑1 / -10‑2, IEC 60079‑14, EI 15, and IGEM/SR/25.

Every 3–5 years or following modifications to processes, substances, or ventilation.

Yes. Ecfio frequently reviews and updates older or inconsistent DSEAR documentation.

P&IDs, site plans, ventilation data, MSDSs, equipment lists, and access to operational personnel.

We provide a prioritised action plan and, if required, can support follow‑up DSEAR risk assessment, HAC studies, and verification work.

Intrinsic safety (IS) is a protection concept ensuring electrical equipment in hazardous areas cannot release enough energy — by spark or thermal effect — to ignite an explosive atmosphere. It is widely used in low-power control, instrumentation, and telemetry systems where continuous operation and safety are critical.

A Design Safety Document (DSD) is a formal record demonstrating that an intrinsically safe system complies with IEC/BS EN 60079-11, -14, and -25.

It compiles loop drawings, energy calculations, equipment certificates, and cable data to prove that the system remains intrinsically safe under normal and fault conditions.

DSDs are a key deliverable for verification and are routinely reviewed during DSEAR or Ex inspections.

Whenever an IS system or loop is designed, modified, or verified, a DSD should be produced or updated. It provides documented assurance that all components—barriers, isolators, field devices, and wiring—remain within certified energy limits.

Verification involves:

• Reviewingloop calculations and energy parameters.
• Checkingequipment certification for compatibility.
• Confirmingcable length and capacitance/inductance 
• Ensuring segregation between IS and non-IS wiring.
  Ecfio engineers can independently verify or compile DSDs to meet audit and regulatory standards.

• IEC/BS EN 60079-11– Intrinsic safety “i” protection method.
• IEC/BS EN 60079-14– Installation requirements for hazardous areas.
• IEC/BS EN 60079-25– IS system design, documentation, and verification process.

IS systems limit electrical energy at its source, preventing ignition. Explosion-proof (Ex d) systems contain any ignition within an enclosure. IS design is typically preferred for low-voltage, maintenance-accessible control systems.

Each IS circuit is cross-checked against the zone classification (Zone 0, 1, 2 / 20, 21, 22) defined in the HAC. The DSD confirms that all devices and wiring meet the protection level required for that area.

Yes. We routinely review and update legacy DSDs to ensure alignment with current standards and to close documentation gaps before inspection or audit.

• IS loop and wiring diagrams
• Equipment datasheets and Ex certificates
• Cable schedules and capacitance data
• IS system verification reports
• Maintenance and inspection records (BS EN 60079-17)

It provides a traceable record of compliance, supports modification control, and simplifies future verification. Insurers and regulators increasingly request DSDs as evidence of due diligence for hazardous area systems.

IS systems and DSDs are standard practice in:

• Oil & Gas (refineries, terminals, offshore platforms)
• Chemical manufacturing and storage
• Utilities (water, wastewater, pumping stations)
• Hydrogen production and refuelling
• Food & Drink (mills, distilleries, breweries)

It’s an evaluation of explosion and fire risks from dangerous substances, considering the likelihood of formation and ignition of explosive atmospheres.

HAC defines the extent and likelihood of explosive atmospheres (zones), forming the technical foundation for equipment selection and control measures under DSEAR and is specified as a requirement under Reg 7

Assessments follow HSE L138, IEC 60079-10-1/-10-2, IEC 60079-14, and Industry codes of practice such as Energy Institute EI 15 and IGEM/SR/25.

After a “suitable period of time”. This typically means every three to five years, or whenever changes occur to processes, substances, or ventilation systems. We often provide competent resource to attended site and walk through the requirements to ensure that everything is up to date and that any onsite changes have been adequately included in the site documentation. 

Process and instrumentation diagrams (P&IDs), site layout and ventilation drawings, Material Safety Data Sheets (MSDS), equipment lists, maintenance records, and access to operational and maintenance teams.

Yes. Ecfio frequently audits or updates older DSEAR and HAC reports to align with current best practice and correct inconsistencies in classification or documentation.

A clear scope and methodology, hazard identification and zone classification data, calculations or engineering justification for zoning, recommendations for improvements, and drawings suitable for engineering and inspection use.

Any workplace where flammable gases, vapours, or dusts are present — including energy, chemicals, manufacturing, utilities, food and drink, and waste management sectors.

We will hold a handover meeting in which we will provide a prioritised action plan with clear responsibilities, helping clients update drawings, verification records, and maintenance systems to ensure ongoing compliance.