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For underground installations, the minimum pressure requirement is essential to ensure that the systems function effectively and can handle the conditions they will encounter once installed. A pressure of 34 kPa (5 PSI) is the industry standard that provides sufficient safeguarding against potential ingress of water, soil, and other external factors that could compromise the integrity of the underground systems.

This level of pressure ensures that the conduit or enclosure maintains its structural integrity and protects the internal cabling or infrastructure from moisture and physical damage. It acts as a safety buffer, ensuring that the system can withstand variations in external pressures due to soil saturation, shifting ground, or other environmental factors.

In contrast, lower pressure thresholds may not offer the necessary protection and could lead to operational failures or damage over time. Therefore, adhering to the 34 kPa standard is crucial for long-term reliability and performance of underground installations.