Usually those 5-turn burner elements are designed for 240Vac and 2000W of full power make them red hot. Using them at 120Vac makes them 500W, which is probably plenty for your smoker, but they'll run "on" longer and won't get red hot. If this is from a 120V hot plate, it prob gets red hot when on. Your wiring all looks safe and professional but this does mean in a vertical smoker that the lower tray of meat/fish is getting both infrared and convective cooking power but the top trays, even if your measured temperature inside is perfectly uniform, is getting just convective heating since the lower meat is "shading" the IR component.
If you find your meat isn't cooking uniformly, you can add a "heat shield" just a simple piece of steel about an inch above the element, just large enough that none of the lower meat "sees" the red hot element, and that will greatly reduce the cooking inequality.