The electrician determined that the old conduits could be replaced with new PVC and wiring. Of course, some portion of the old conduit pipe had to be retained where it came out of the foundation, and it had to be joined up to the new sections. He made the junction inside what is called a "Christy box", a sunken container open on the bottom with a removable cover. The photo below at the left shows the box on the bedroom side of the atrium with the old conduits coming in from the left side. A portion of the foundation is visible at the left. The box cover is on the right.

Traditionally these boxes are rectangular in shape and made of concrete. You probably have one or two in the front yard of your house where the sewer connection is or the water meter. Recently they started manufacturing them from fibreglass, which is what is shown here. With fibreglass it is easy to make cutouts on the side of the box to bring in the old and new conduits. The photo below at right shows one of two boxes on the garage/living room side of the atrium, the foundation is at the right.