TSSA G3 Gas Trade Training Units

Complete coverage of all Gas Trade Training Units required for TSSA G3 (Gas Technician 3 - Basic) certification in Ontario. All materials aligned with CSA B149.1-25 and CSA B149.2-25 code requirements.

📋 G3 Certification Requirements

Units Required: Gas Trade Units 1-9 (all units listed below)
Code Knowledge: CSA B149.1-25 fundamentals, CSA B149.2-25 basics
Prerequisites: High school diploma, enrollment in TSSA-accredited training program
Exam Format: Multiple choice (50-110 questions depending on unit)
Passing Grade: 75% or higher on all unit exams
Work Scope: Under supervision on appliances up to 400,000 BTUH
Next Step: G2 certification after 2 years (4,000 hours) of documented experience

Unit 1: Safety

Foundation of all gas technician work - personal safety, workplace hazards, gas system safety, and emergency procedures.

Personal protective equipment and safety gear
Workplace hazard identification
Gas system safety protocols
Emergency response procedures

CSA Code: B149.1-25 Section 2, 3

📖 Study Material ✅ Practice Questions

Unit 2: Tools, Fasteners & Testing Equipment

Master the tools and testing equipment used in gas installations and service work - essential for code-compliant installations.

Hand tools and power tools
Fasteners and gas-tight connections
Combustion testing instruments
Pressure testing and leak detection
Electrical testing equipment

CSA Code: B149.1-25 Section 8

📖 Study Material ✅ Practice Questions

Unit 3: Properties of Natural Gas & Propane

Understanding fuel properties, combustion principles, and safe handling of natural gas and propane - foundation for all gas work.

Properties of Natural Gas
Properties of Propane
Combustion Principles
Safe Fuel Handling

CSA Code: B149.1-25 Fuel Properties

📖 Study Material ✅ Practice Questions

Unit 4: Codes & Regulations

Understanding CSA B149.1-25, code structure, scope, definitions, and general requirements for gas installations.

CSA B149.1-25 code structure
Scope and application
Definitions and terminology
General installation requirements

CSA Code: B149.1-25 All Sections

📖 Study Material ✅ Practice Questions

Unit 4a: Ontario Regulations

Provincial regulations specific to Ontario - O. Reg. 215/01, TSSA Act, licensing requirements, and inspection procedures.

Ontario Regulation 215/01
TSSA Act and enforcement
Licensing and certification
Inspection and compliance

Regulations: O. Reg. 215/01, TSSA Act

📖 Study Material ✅ Practice Questions

Unit 5: Basic Electricity

Electrical fundamentals for gas systems - circuits, testing, grounding, and safety requirements for gas appliances.

DC and AC electricity
Circuits and electrical components
Motors and transformers
Electronics in gas systems
Electrical testing and troubleshooting
Grounding and bonding

CSA Code: B149.1-25 Section 3

📖 Study Material ✅ Practice Questions

Unit 6: Technical Drawing, Manuals & Graphs

Reading blueprints, piping diagrams, manufacturer manuals, and technical documentation for gas installations.

Blueprint reading and interpretation
Piping diagrams and symbols
Manufacturer manuals and specifications
Graphs and technical charts

CSA Code: B149.1-25 Section 4

📖 Study Material ✅ Practice Questions

Unit 7: Customer Relations

Professional communication, customer service, conflict resolution, and maintaining a positive service experience.

Professional communication skills
Customer service excellence
Conflict resolution techniques
Building customer trust

Focus: Professional conduct and communication

📖 Study Material ✅ Practice Questions

Unit 8: Introduction to Piping

Foundation of gas piping systems - materials, sizing basics, connections, and support requirements per CSA B149.1-25.

Piping materials and specifications
Basic pipe sizing principles
Connections and fittings
Support and protection requirements

CSA Code: B149.1-25 Section 4

📖 Study Material ✅ Practice Questions

Unit 9: Introduction to Gas Appliances

Gas appliance types, basic installation, clearances, and manufacturer requirements - foundation for appliance work.

Appliance categories and types
Basic installation requirements
Clearances and spacing
Manufacturer specifications

CSA Code: B149.1-25 Section 3, 6

📖 Study Material ✅ Practice Questions

📚 Recommended G3 Study Path

Start with Unit 1: Safety - Build a strong foundation with safety protocols and procedures. This is critical for all gas work.
Progress to Unit 2: Tools - Learn the tools you'll use daily. Understanding your equipment is essential before studying installations.
Study Unit 4 & 4a: Codes - Understand the CSA B149.1-25 code structure and Ontario regulations. This is the framework for everything else.
Complete Unit 3: Venting - Master venting and combustion air - critical for safe appliance operation and frequent exam topic.
Learn Unit 8: Piping - Gas piping fundamentals. Build on this knowledge as you progress to more complex installations.
Study Unit 9: Appliances - Introduction to gas appliances. Connect piping knowledge to actual equipment installations.
Complete Unit 5: Electricity - Electrical fundamentals for gas systems. Essential for control circuits and troubleshooting.
Finish Unit 6: Technical Drawing - Blueprint reading and technical documentation. Ties everything together.
Review Unit 7: Customer Relations - Professional conduct and communication. Important for career success.
Take Practice Exams - Test your knowledge regularly with chapter reviews and unit exams. Aim for 75%+ consistently.
Review CSA B149.1-25 Throughout - Use Code Compass to reference specific code sections as you study each unit.
Complete TSSA-Accredited Program - This self-study supplements but doesn't replace required formal training for exam eligibility.

🚀 Ready to Begin Your G3 Certification Journey?

Start with Unit 1: Safety → Study CSA B149.1-25 Code → Launch AI Tutor →

📚 Additional Study Resources

⚠️ Independent Educational Content

CSA-Compliant Study Materials: This content is provided by LARK Labs as independent educational resources based on CSA B149.1-25 (Natural Gas and Propane Installation Code) and industry-standard Gas Trade Training curriculum. We are not affiliated with CSA Group or TSSA.

Complementary Training: These materials complement official TSSA-accredited training programs but do not replace certified instruction required for TSSA G3 certification eligibility. You must complete an approved training program to write the TSSA exams.

Code References: All code references are to CSA B149.1-25 (17th Edition, 2025) and CSA B149.2-25 unless otherwise noted. Always consult the official published codes for authoritative information.

Created by: Mike Kapin | 20 years field experience + 10 years teaching HVAC programs at Fanshawe College