In which year did the United Association (UA) mandate a five-year apprenticeship?

The United Association (UA) mandated a five-year apprenticeship in 1921 as a way to standardize training and ensure high-quality workmanship among its members. This decision reflected the growing complexity of plumbing, pipefitting, and HVACR work at the time, requiring more in-depth training and experience to prepare apprentices for the challenges of the trade. By extending the apprenticeship period to five years, the UA aimed to equip its workforce with the necessary skills and knowledge to meet industry standards and demands, ultimately enhancing safety and professionalism within the trade.

The other years listed do not correspond with significant changes regarding apprenticeship lengths in the UA; 1889 marks the establishment of the UA, while 1954 and 2001 do not indicate the introduction of a five-year apprenticeship model.