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GFCI and AFCI Testing Explained | How to Test Ground Fault and Arc Fault Circuit Interrupters

Learn the essential skills for GFCI and AFCI testing using Klein Tools RT390 Circuit Analyzer in this comprehensive HVAC training. This video shows how to test Ground Fault and Arc Fault Circuit Interrupters in residential environments, covering everything technicians need to know about electrical safety testing.

What You’ll Learn:

  • GFCI Testing – Understanding how Ground Fault Circuit Interrupters protect against electrical shock in wet environments like bathrooms, kitchens, garages, and outdoor spaces
  • AFCI Testing – How Arc Fault Circuit Interrupters prevent electrical fires by detecting dangerous arcing conditions
  • Professional Testing Equipment – How to use advanced circuit testers with GFCI, AFCI, 30mA, and load testing capabilities
  • Electrical Safety Fundamentals – Why standard circuit breakers (15-20 amp) won’t protect you from electrical shock
  • Troubleshooting Techniques – How to identify wiring issues, voltage drops, and circuit problems using load testing
  • Thermal Imaging Tips – Why AFCI breakers run hotter and what to look for during panel inspections

 

Key Topics Covered:

  • How GFCI devices detect current imbalances between hot and neutral wires
  • Why wet environments require GFCI protection (bathrooms, kitchens, outdoor outlets)
  • Understanding human body resistance and why standard breakers won’t protect you (resistance explained with live demonstration)
  • How AFCI breakers detect arc signatures to prevent electrical fires
  • Where AFCI protection is required in modern homes (occupied rooms, convenience outlets)
  • Step-by-step guide to using professional circuit testing tools
  • The 30 milliamp test function and what it simulates
  • Load testing to check voltage drop under various load conditions
  • How to identify improperly wired outlets (reversed polarity, neutral-ground issues)
  • Best practices for maintenance inspections without testing every outlet

 

Perfect for:

  • HVAC Technicians expanding their electrical knowledge
  • Maintenance professionals performing home inspections
  • Electricians looking for testing best practices
  • Home inspectors needing electrical safety training
  • Anyone interested in residential electrical safety

 

Pro Tips Included:

  • High-risk areas to prioritize during inspections (bathrooms, garages, porches)
  • How to have effective conversations with clients about electrical concerns
  • Understanding why AFCI breakers appear hot on thermal cameras
  • When to call a licensed electrician vs. handling issues yourself

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