For "old work", how is it common to install cables behind the finished surface?

Fishing the cable refers to a method commonly used in "old work" installations where cables need to be routed behind existing finished surfaces, such as drywall. This technique is essential in scenarios where access to the wall cavity is limited and where traditional methods, like running cables through newly constructed walls, are not possible.

When fishing a cable, electricians typically use tools such as flexible fish tapes or rods to guide the cable through small openings or existing holes in the walls. This process allows the cable to be pulled through the space without having to open up large portions of the wall, preserving the integrity of the finished surfaces and minimizing the amount of patchwork needed afterward.

The utilization of this method reflects a common practice in the electrical trade, as it provides an efficient solution for retrofitting electrical systems in older buildings or renovation projects without significant structural alterations.