Bending a rolling offset

A rolling offset moves the conduit two ways at once, say up 6" and over 8" to reach a box that isn’t straight above or beside the run. Instead of two offsets, bend one offset along the diagonal and roll it over so its bends lean out of plumb.

What to measure

• Rise: how far the conduit has to move up or down, center to center.
• Roll: how far it has to move sideways, center to center.
• Angle: both bends are bent to it, as on a plain offset.
• Distance to obstruction (optional): from the end of the conduit, with the offset finished there or starting there, as on the Offset screen.

How to bend it

1. Enter the rise, roll and angle. The calculator gives the True offset, the diagonal the conduit actually travels, and the marks for an offset of that height.
2. Mark and bend it exactly like an offset: first mark on the arrow with the hook facing the end, then roll the conduit half a turn and bend the second mark to the same angle.
3. Hold the conduit in place and turn it on its own axis until the bends lean out of plumb by the Roll bends angle, toward the side it has to move.
4. Check that the far leg sits at the right height and the right distance over before you fasten it.

Where the numbers come from

From there it is an ordinary offset of the true offset height, with the same allowance for the shoe’s radius as the Offset screen.

If it turns orange or red

The colors are the Offset screen’s, for the true offset. Red means the two bends would run into each other, and orange that there is too little straight between them for the shoe to grip. Use a smaller angle.