You're right to question that. It's a common misconception and a violation of electrical code in many jurisdictions. Here's the breakdown: Ceiling Grids and Box Support

The boxes themselves are often permitted to be supported by the ceiling grid in certain conditions, up to a certain weight and typically using listed clips or fasteners specifically designed for that purpose. The box is secured to the grid so it is a firm structure, and doesn't fall down from vibrations or other incidents.

Wires and Cable Support: NOT the Same Thing

This is where the critical distinction lies.

Electrical code almost always requires that wiring (cables and conductors) be independently supported. This means the wires cannot simply hang from the box or rest on the ceiling grid. They need to be secured to a building structural member with appropriate fasteners (cable ties, J-hooks, staples, etc.) spaced at regular intervals (typically every few feet). Why Independent Support is Crucial



Weight

Wires can be heavy, especially bundled together. Relying on the box or grid to support the weight puts undue stress on those components and can lead to failure.

Strain Relief

Wires entering a box need strain relief to prevent tension on the connections inside the box. If the wire is not properly supported, movement or pulling on the wire can put stress on the terminals inside the box, loosening connections or even causing arcing and fire hazards.

Code Compliance

Most electrical codes (like the NEC in the US) explicitly state requirements for independent support of wiring. It's a fundamental safety principle.

Future Access

It's much easier to pull new wires or make changes if the existing wires are neatly supported.

Why the Picture Might Be Wrong or Misleading



Simplified Illustration

Sometimes diagrams are simplified for clarity and don't show every detail. But in this case, omitting the wire support is a significant omission.

Incorrect Installation

Unfortunately, it's entirely possible that the installation in the picture is simply wrong and not up to code.

Specific Local Codes

While unlikely, it's possible there might be some extremely specific local codes that differ from general practice, but it's highly doubtful.

In summary: A picture showing wires not supported independently from the box or grid is likely either misleading or depicts a non-compliant installation. The wires must* be secured to the building structure. Flag for review