3 Steps to Test an Extension Cord for Internal Breaks

Plug a lamp into the extension cord and turn it on A simple lamp or small appliance works best because it draws enough power to reveal a break.

Slowly bend the cord along its length Focus on areas near the ends and where the cord has been kinked or pinched. If the lamp flickers or goes out at a specific spot, you have found an internal break.

Check the plugs first for bent prongs or loose connections Those are fast fixes. If the lamp flickers, replace the cord — a broken internal wire can overheat or arc and is not worth the risk.