Final answer:
The selection of shoring members in trench work is indeed based on the trench's height and width to ensure the system supports the load and complies with safety standards, making the statement true.
Step-by-step explanation:
The statement that the selection of size and spacing of shoring members is based on the height and width of the trench is True. When determining the appropriate shoring system for a trench, it is crucial to consider the dimensions of the trench because they directly influence the load that the shoring system will need to support. Incorrect sizing or spacing can lead to a failure of the system, potentially causing cave-ins and endangering lives.
Shoring is a safety measure used in trench work to support the walls of the trench to prevent collapses. The size and spacing of the shoring system components, such as vertical shores or horizontal walers, should be designed based on various factors, including soil conditions, trench dimensions, and expected loads. OSHA regulations provide guidelines and requirements for shoring installations to ensure worker safety in excavations and trenches.