Which of the following is NOT a main type of scaffolding system?

Brick scaffolding is considered NOT a main type of scaffolding system because it doesn't represent a formal category used in the construction industry. The other options—frame, modular, and suspended scaffolding—are established and widely recognized types that have specific designs and applications.

Frame scaffolding consists of a series of connected frames that provide a stable structure for workers, materials, and equipment, facilitating horizontal and vertical access to various heights. Modular scaffolding is designed using pre-engineered components that can be assembled in various configurations, making it versatile and adaptable to different construction needs. Suspended scaffolding involves platforms that are hung from a building or structure using ropes or cables, allowing workers to reach high areas efficiently.

In contrast, 'brick scaffolding' does not refer to a distinct or formal category within scaffolding systems, and it may cause confusion as it is not a recognized method in scaffolding practices. This highlights the importance of understanding the specific types of scaffolding used in the industry to ensure safety and effectiveness on construction sites.