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Washington HVAC/Refrigeration - Restricted (6B) Contractor License

The HVAC/Refrigeration - Restricted (6B) Contractor License allows you to do the following work:

  • Install, repair, maintain:
    • Telecommunications
    • Class 2 low-voltage control circuit wiring and components
  • 30 volts and less control and limited voltage line work within 250 volts, 125 amp, single phase HVAC/R systems

CANNOT perform electrical work if the primary electrical power connection to the HVAC/refrigeration system exceeds 250 volts, single phase, or 120 amps.

How to Get the HVAC/Refrigeration - Restricted (6B) Contractor’s License in Washington?

  1. Be an electrical trainee or have equivalent out-of-state or military experience
  2. Meet the experience and training requirements:
    You can use the Washington Department of Labor & Industries' tool to verify the hours of experience
    • HVAC/Refrigeration - Restricted (6B):
      • 2,000 hours of work experience related to the selected specialty as an electrical trainee
      • 24 hours of basic classroom instruction
      • Be supervised 75% of the time
  3. Fill out the corresponding application form for the electrical examination:
  4. Mail the application and the documents needed to certify the experience required for each license to:
    Electrical Licensing and Certification
    PO Box 44460
    Olympia WA 98504-4460
  5. Register with PSI© and schedule the examination once the application has been reviewed by the Washington State Department of Labor & Industries. For more information on the test, refer to PSI©’s Electrical Certification Candidate Information Bulletin

Washington HVAC/Refrigeration - Restricted (6B) Contractor License Exam Prep Courses

Washington HVAC/Refrigeration - Restricted (6B) Contractor License Exams

Below is all the information related to the trade and WA Codes exams, including the official reference lists.

Washington HVAC/Refrigeration - Restricted (6B) Contractor Trade Exam

  • Testing Method: Computer-based testing
  • Testing Company: PSI©
  • Number of Questions: 20
  • Types of Questions: Multiple choice
  • Time Allowed: 60 Minutes
  • Minimum Passing Score: 70%
  • Subjects Involved (No. of Questions):
    • NEC 90 - Introduction (1)
    • NEC 100-110 - General Requirements (1)
    • NEC 240 - Overcurrent Protection (2)
    • NEC 250 - Grounding & Bonding (2)
    • NEC 300-398 - Wiring Methods (3)
    • NEC 400-427, 455-480 - Electrical Equipment (1)
    • NEC 430-450 - Motors, HVAC, Generators & Transformers (3)
    • NEC 500-516 - Hazardous Locations (1)
    • NEC 705-780 - Special Conditions (2)
    • General Trade Knowledge & Theory (4)
  • PSI© HVAC/Refrigeration - Restricted (6B) Official Content Outline

Washington HVAC/Refrigeration - Restricted (6B) Contractor WA Codes Exam

  • Testing Method: Computer-based testing
  • Testing Company: PSI©
  • Number of Questions: 17
  • Types of Questions: Multiple choice
  • Time Allowed: 60 Minutes
  • Minimum Passing Score: 70%
  • Subjects Involved (No. of Questions):
    • Washington Laws & Rules (RCW & WAC) (17)
  • PSI© WA Codes Official Content Outline

Washington HVAC/Refrigeration - Restricted (6B) Contractor Book Set

This set of books includes all required references for the HVAC/Refrigeration - Restricted (6B) and WA Codes exams. Orders placed before 2 PM are shipped the same day via UPS and a tracking number is emailed before 3 PM.

  • WASHINGTON HVAC/REFRIGERATION - RESTRICTED (6B) - BOOK SET WITHOUT TABS INCLUDES ALL BOOKS FOR TRADE AND BUSINESS EXAMS

    Sales price: $349.45

  • WASHINGTON HVAC/REFRIGERATION - RESTRICTED (6B) - BOOK SET WITH TABS INCLUDES ALL BOOKS FOR TRADE AND BUSINESS EXAMS

    Sales price: $399.45

Washington HVAC/Refrigeration - Restricted (6B) Contractor Exam Books

Books Allowed in Testing

Washington HVAC/Refrigeration - Restricted (6B) WA Codes Exam Books

Books Allowed in Testing

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