What must be ensured regarding the vertical support for guardrails above ground?

The requirement for vertical support for guardrails above ground being no more than 4 feet apart is grounded in safety regulations aimed at ensuring the structural integrity and stability of the guardrails. When vertical supports are spaced appropriately, the guardrail system effectively prevents accidental falls and provides adequate protection for workers or individuals near elevated surfaces. This spacing helps to maintain the strength of the guardrail, ensuring that it can withstand the forces that may be applied to it during use.

In contrast, spacing supports too far apart could lead to weakening of the system, increasing the risk of failure under load, which could result in serious accidents. Proper adherence to the 4-foot spacing guideline is vital for compliance with safety standards and provides reassurance that the guardrail will perform as intended in preventing falls. This standard is part of broader occupational safety regulations that strive to protect workers and maintain a safe working environment.