通常、過去4〜5年間の米国での見習い。この間、あなたは実地訓練と教室の両方の指導を受けます。

さらに、多くの州では、電気技師が試験に合格して認可されるように要求しています。
Typically, apprenticeships in the US last 4–5 years. During this time you'll receive both on-the-job training and classroom instruction. 

Additionally, many states require electricians to pass an exam to become licensed, which can take several months of study.