Can You Tack Electrical Wiring Across Floor Joists?

Size

• Most state electrical codes dictate that residents can't attach electrical wiring to floor joists unless the wires measure 6-2, 8-3 or larger. Smaller wires must run through holes drilled through joists or must be attached to a running board. This rule was established partly to stop people from using wires attached to joists as clotheslines. Check your state's electrical code before starting work.

Location

• All wiring that is tacked to floor joists should be easily accessible. You or an electrician need to be able to get to the wiring easily if the home experiences electrical problems. Wiring always should be tacked along the bottom of floor joists and as far from floorboards as possible.

Method

• Electrical wiring that can be secured to floor joists is tacked to the joists with staples and a hammer before it is connected to the power supply. Pull the wire taut against a joist, and use a staple every 20 inches. Turn off the electrical circuit to which the wiring will be connected before actually making that connection.

Considerations

• Drilling holes through floor joists requires care because cutting through wires with a power tool will result in costly repairs and is extremely dangerous. Ensure that everybody you live with is aware that the wires carry an electrical current and should not be used to hang items. All electrical fixtures fitted to floor joists should be at least 3 inches from insulation unless they are rated for insulation contact.