Final answer:
Oil canning refers to the visible waviness on the sides of metal panels such as those on aluminum or steel electrical junction boxes, which could be due to various factors, including stress or manufacturing defects.
Step-by-step explanation:
Oil canning is a term used to describe the visible distortion or waviness in the flat areas of metal panels, which is not considered acceptable for finished work. In the context of aluminum or steel electrical junction boxes, oil canning might occur on the sides due to improper handling, thermal expansion, or mechanical forces. While some flatness deviation is normal due to material properties and manufacturing processes, excessive oil canning can be a sign of stress or manufacturing defects which can compromise the structural integrity of the junction boxes.
When inspecting a junction box, you might simulate a scenario where this effect is displayed. Imagine using a large flat tray with raised sides, such as a baking tray. Apply small volumes of various types of oil, like motor oil, lighter fluid, or penetrating oil, which could be used to simulate the slippery and sometimes harsh conditions an electrical box could be exposed to in an industrial setting. Adding water to the tray could illustrate the pooling effect or how the material of the tray, similar to the material of the junction box, can react to substances it might come into contact with in an actual use case. Using a camera to capture images of the oil canning would provide a visual reference for the extent of the distortion.