How To Properly Install Junction Box Into Rafter In Attic

Mount the box in such a way that all the cables entering and.

How to properly install junction box into rafter in attic. Making up joints in an attic. For junction boxes installed on the ceiling run the cable from the ceiling down into the box. Since insulation is combustible you must install face plates on all attic junction boxes to prevent contact between bare wires and insulation materials. The cable sheathing outer jacket should extend 1 4 to 1 2 inch into the box beyond the clamp and the individual conducting wires should extend about 6 inches into the box.

Feed the cables through the clamps and into the box. Active oldest votes 1 junction boxes on rafters are fine but make sure there s at least 1 5 clearance from the back of the junction box to the outside edge of the rafter since roof sheathing properly installed will be nailed with 1 5 penetration into the rafter and cables enter the junction box right at the back. Junction box mounting locations there are two options for mounting boxes that are wholly contained within the attic. You can attach them to the joist s side surface called the face or to the joist s top surface called the edge.

Fasten the cable using a wire staple within 12 inches 30 cm of the box to secure it. Mount the j box to the side of a framing member such as a wall stud ceiling rafter or floor beam using two 8 by 1 inch wood screws.