National And International Unions

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 United Association (UA)

• Full Name: United Association of Journeymen and Apprentices of the Plumbing, Pipefitting and Sprinkler Fitting Industry of the United States and Canada.
   
• Scope: Plumbers, pipefitters, sprinkler fitters, HVACR (Heating, Ventilation, Air Conditioning & Refrigeration) service technicians, and welders.
   
• Notes: This is the primary union representing plumbing, HVAC and welding trades nationally with local affiliates across the U.S. 

https://ua.org/ 

 International Brotherhood of Electrical Workers (IBEW)

• Full Name: International Brotherhood of Electrical Workers Wikipedia
   
• Scope: Electricians working in construction, utilities, telecommunications, and related industries. NABTU
   
• Notes: One of the largest skilled-trades unions in North America, representing electricians through many local unions nationwide

https://ibew.org/

 International Association of Sheet Metal, Air, Rail & Transportation Workers (SMART)

• Full Name: International Association of Sheet Metal, Air, Rail and Transportation Workers
   
• Scope: Represents sheet metal workers (including fabrication and installation of HVAC ductwork), some service technicians, and welders within certain units.
   
• Notes: Nationwide union with local affiliates.

https://www.smart-union.org/

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