Description

A pattress or pattress box is the container for the space behind electrical fittings such as power outlet sockets and light switches.

Some electricians use the term “pattress box” to describe a surface-mounted box, although simply the term “pattress” suffices. The term “flush box” is used for a mounting box that goes inside the wall, although some use the term “wall box”.

The term “pattress” is rarely seen in the United States or Canada, where the equivalent term is device box or switch box.