How to Safely Run Extension Cords Through Your Window for Outdoor Lighting

Why You May Want to Run Cords Through a Window

Adding outdoor lighting can greatly improve the look and safety of your home's exterior. However, getting power to these lights often requires running electrical cords from indoors to outdoors. Running cords out a door can leave unsightly gaps or tripping hazards, while running them through walls requires permanent installation. For a flexible, reversible option, feeding cords through a window is an easy DIY solution.

Potential Risks and How to Avoid Them

Running cords out a window does carry some safety considerations. Follow these tips to avoid potential hazards:

• Use GFCI protection - Outdoors, electrical cords should always be used with GFCI (ground fault circuit interrupter) outlets. GFCIs shut off power if a ground fault is detected, preventing shocks.

• Keep cords clear of water - Don't let cords sit in puddles or snow. Use outdoor-rated, water-resistant cords.

• Avoid pinching the cord - Leave some slack so the cord isn't stretched tight or pinched in the window frame. This can damage the insulation over time.

• Secure cords properly - Use cord guides or clamps so cords don't tug loose or get strained. Don't just knot cords.

• Check condition frequently - Inspect cords for damage to the insulation or plugs. Replace immediately if any is found.

How to Run Cords Safely Through Windows

Running extension cords through windows is a simple process, though some planning helps do it neatly and safely:

Gather Supplies

• Outdoor extension cord(s) - 12-16 gauge rated for outdoor use. Match length to needs.
• Surge protector (optional) - Protects devices from power spikes.
• GFCI outlet or GFCI adapter - For ground fault protection.
• Cord conduit or clips - To run cord neatly through window.
• Weather sealant (optional) - Caulk small gaps around cord.

Choose a Window

• Pick a first floor window closest to your electrical panel. This minimizes distance and tripping hazards.
• Ensure window fully closes around cord to block weather and insects.
• A sliding window usually works best for running a cord in and out.

Run the Cord Through

• Coil excess cord to avoid pinching and leave some slack.
• For sliding windows, run cord between frame and sliding pane.
• For hinged windows, rout cord underneath the pane in the slot.
• Secure cord with plastic clips or conduit. Avoid excess sagging.

Seal and Secure

• Caulk small gaps around cord if needed to maintain weather seal. Remove cord before fully closing window.
• Attach GFCI outlet or adapter to the cord's indoor end.
  -Plug in and turn on outdoor lights to test operation.
• Label cord at the outlet and window so it's not unplugged.

With proper precautions, running cords through a window is a safe, convenient way to connect outdoor lighting. Just be sure to use heavy-duty outdoor cords and GFCI protection. And inspect cords periodically for any damage before use.