In a 3-phase bus arrangement, which of the following sequences is correct when viewed from the front?

In a 3-phase bus arrangement, viewing the sequence as A, B, C from front to back is the standard convention. This arrangement follows the industry practice of aligning the phases in a logical order that facilitates clear understanding of the setup and ensures ease of identification for maintenance and operation.

When visualizing the bus from the front, the phases are typically organized to minimize errors and confusion, especially during connections or troubleshooting. Arranging the phases front to back helps maintain consistency across various installations, as this configuration is commonly adopted in electrical engineering.

Other arrangements, such as left to right, or from top to bottom, do not adhere to the prevalent conventions used in 3-phase systems. Such variations can lead to misunderstanding and incorrect setups, especially in environments where multiple technicians may be involved in working with the system. Hence, the front-to-back arrangement of A, B, C is crucial for clarity in a 3-phase bus setup.