Understand Expansion Coupling Function and Midpoint Placement

What happens here

The video begins with a journeyman electrician explaining the function of an expansion coupling for outdoor electrical lines. He demonstrates how the coupling expands and contracts to compensate for thermal changes when exposed to the sun over time. He highlights the importance of installing the coupling at the 'midpoint' of the conduit run. This allows for equal expansion and contraction in both directions from the coupling, preventing stress and damage to the electrical system.

Goal: Understand the purpose and correct placement of an expansion coupling.