What must be ensured regarding a support system before an excavation can proceed?

Ensuring that a support system is designed to withstand calculated forces is essential for the safety and stability of any excavation. This means analyzing the soil conditions, the depth of the excavation, and any anticipated loads or pressures that may be exerted on the walls of the excavation site. Proper engineering and design considerations must be applied to prevent collapses or failures which can pose serious risks to workers and surrounding structures.

For instance, if the support system is not adequately designed to counteract the lateral forces from the earth or any additional loads, such as equipment operating nearby, the system could fail, leading to hazardous situations. Properly designed support systems enhance worker safety and support regulatory compliance, making it a crucial factor before any excavation work begins.