What is the expected size of cable for ASTM Grade 7 personal protective grounds?

The expected size of cable for ASTM Grade 7 personal protective grounds is 350 kcmil. This choice is based on the specific requirements for grounding systems to ensure that they can handle the fault currents that may occur during electrical disturbances. ASTM Grade 7 is defined to ensure safe and effective operation under high fault conditions.

When selecting grounding cables, it's essential to consider their ability to conduct fault current without sustaining damage or overheating. The 350 kcmil size balances the need for conductivity while providing ample mechanical strength and flexibility suited for grounding applications.

In contrast, other sizes such as 250 kcmil or 4/0 may not provide the same level of performance under the anticipated conditions that Grade 7 grounds are expected to withstand. Options like 2 are significantly undersized for this application, making them unsuitable for safe protection. Therefore, 350 kcmil is the ideal choice to meet the safety standards and performance requirements for personal protective grounds at this grade.