Engineering for Hazardous Location Compliance & Risk Mitigation

Facilities that handle flammable vapours, dusts, or fibers must meet strict hazardous location compliance requirements under Ontario and Canadian electrical codes. At HITE Engineering, we specialize in hazardous area classification, electrical design reviews, and documentation to ensure your workplace is safe, legally compliant, and operating without risk of fire or explosion.

From manufacturing and processing plants to plating rooms and fuel-handling areas, our team supports facility owners, employers, and consultants in identifying and managing hazardous environments in line with Section 18 of the Ontario Electrical Safety Code, NFPA 70, and CSA/IEC standards.

What Qualifies as a Hazardous Location?

A hazardous location is any area where flammable substances—vapours, gases, dusts, or fibers—may be present in sufficient quantities to create a fire or explosion risk. The classification depends on the type of material and how often it is present:

Class I: Flammable gases or vapours (e.g., natural gas, gasoline)
Class II: Combustible dusts (e.g., grain dust, metal dust)
Class III: Ignitable fibers or flyings (e.g., textiles, wood shavings)

Examples of Hazardous Locations:

Fuel storage or transfer areas
Chemical processing plants
Grain handling or food processing facilities
Plating and brush coating rooms
Paint spray booths

HITE has experience providing engineering support across these and other high-risk sectors.

Hazardous Area Classification Services

We help clients assess and document hazardous areas through detailed evaluation and certified engineering reports.

Services Include:

Zone Classification: Class I Division 1 / 2 or Class I Zone 0 / 1 / 2, as per Ontario Electrical Code Rule 18-004
Hazard Mapping: AutoCAD-based classification drawings indicating the extent of hazardous zones
Ventilation-Based Volume Calculations: Using proven methods to minimize classified zones
Equipment Review & Selection: Ensuring installed components are properly rated by Division, Group, and Temperature Code
Combustible Gas Detection: Application of Rule 18-070 for declassification using gas detection systems

We also provide support for Electrical Safety Authority (ESA) variance applications where non-hazardous-rated equipment is used with gas detection fallback controls.

Applicable Standards and Codes

HITE Engineering delivers fully compliant solutions using all relevant codes and cross-border standards, including:

Ontario Electrical Safety Code (OESC) Section 18
CSA C22.1 and C22.2 Standards
NFPA 70 / NEC Article 500
UL / FM Global Ratings
ATEX and IECEx International Systems

Many of our clients bring in foreign equipment (e.g., from Europe or the U.S.) that requires evaluation and documentation to meet local Ontario or CSA standards. We provide the engineering analysis and documentation needed for proper certification.

Our Engineering Approach

Every classification project follows a structured engineering process to deliver accurate results and clear documentation.

On-site Walkthrough: Review of facility layout, processes, and material handling
Ventilation & Emissions Review: Calculation of flammable vapour volumes based on airflow
Classification Mapping: Development of drawings showing zone boundaries
Code Reference Review: Application of Rule 18-050 and CSA/UL standards
Final Report & Drawing Package: Signed and sealed documentation for your records or submission to ESA

For facilities needing declassification, we engineer combustible gas detection integration in compliance with Rule 18-070, including equipment shutdown logic and system fault detection.

Common Compliance Challenges Solved

We’re often called in to resolve issues such as:

Missing or outdated classification drawings
Installation of non-compliant equipment without gas detection systems
Lack of ventilation analysis for controlling classified area size
No formal documentation for audit or insurer requirements

Real-world examples from recent projects include:

Classification and declassification of a baler room at a packaging facility (Class I Zone 2)
Full documentation and ESA support for a brush plating room at an aerospace facility
Combustible gas detection integration to allow non-hazardous rated equipment use

Why Partner with HITE Engineering

Almost 30 Years of Classification Experience: Trusted since 1997 for hazardous location evaluations
Multi-Standard Expertise: Familiar with CSA, IEC, NFPA, ATEX, and UL frameworks
Clear, Professional Documentation: Signed and sealed reports ready for ESA, AHJs, or insurers
Collaborative Approach: We coordinate with contractors, consultants, and equipment suppliers
Focus on Industrial and Commercial Buildings: Specializing in Ontario facilities—factories, plating shops, food plants, and more

Book Your Hazardous Location Audit or Classification

Whether you’re designing a new process area, upgrading equipment, or addressing ESA deficiencies, HITE can help you ensure full hazardous location compliance.

Call us today to speak to a licensed professional engineer Or request a site classification audit via our contact form

Ask about our audit prep checklist or example reports