It's important to clarify that you should NEVER drill a hole directly in a stud wire (electrical cable). That is extremely dangerous and could result in electrocution, fire, or damage to your electrical system. Instead, you drill through the stud to run the wire.
Here's how to properly drill a hole in a stud for electrical wiring, assuming that's what you meant:
Safe Practices for Drilling Studs for Electrical Wiring
Before drilling any holes, always turn off the power to the circuit you'll be working near at the breaker box. Use a non-contact voltage tester to confirm the power is off.
1. Planning and Preparation
- Determine Wire Path: Plan the route for your electrical wiring. This includes identifying where the wire needs to enter and exit each stud bay.
- Mark Hole Locations: Use a pencil to mark the center point of where you need to drill each hole in the studs. Ensure the holes align horizontally so the wire can run straight.
- Height Considerations: Generally, electrical codes require wires to be run at least 1 1/4 inches back from the edge of the stud. Using metal nail plates where the wiring might be vulnerable is also a code-compliant option. Check your local electrical codes for specific requirements. Consider using a stud finder to verify that you aren't drilling through existing wires or pipes.
2. Choosing the Right Drill Bit and Technique
- Bit Selection: Use a wood-boring drill bit, such as an auger bit or a spade bit. The size should be appropriate for the type of electrical cable you're running. For standard NM-B cable (Romex), a 3/4-inch or 1-inch bit is generally suitable. The "Ask This Old House" video references using an auger bit because it clears wood efficiently.
- Drill Speed: Use a moderate drill speed to prevent splintering the wood.
- Drilling Straight: Hold the drill perpendicular to the stud face to ensure a straight hole.
- Pilot Hole (Optional): For larger diameter bits, drilling a small pilot hole can help guide the larger bit and prevent "walking."
3. Drilling the Hole
- Start Drilling: Position the drill bit on your marked location and begin drilling slowly.
- Maintain Pressure: Apply steady pressure to the drill, allowing the bit to do the work. Avoid forcing the bit, as this can cause it to bind or break.
- Drill Through: Drill completely through the stud.
- Check for Obstructions: Before running wire, visually inspect the hole to ensure there are no sharp edges or splinters that could damage the cable.
4. Running the Wire
- Feed the Wire: Carefully feed the electrical cable through the drilled holes.
- Secure the Wire (If Necessary): Depending on local codes, you may need to secure the wire within the stud bay using staples or cable ties, ensuring not to pinch the cable.
Important Safety Considerations:
- Always de-energize circuits before working with electrical wiring.
- Wear safety glasses to protect your eyes from wood chips.
- Check local electrical codes for specific requirements.
- When in doubt, consult a qualified electrician.
