Power Distribution Units (PDUs) in data centers come in rack-mounted and floor-mounted designs. The most common rack-mounted PDUs are designed to fit standard 19-inch racks and are measured in rack units (U), where 1U equals 1.75 inches in height. The thickness of the enclosure itself varies:
When planning a data center layout, consider both the PDU thickness and the clearance for cabling. For example, a 2-inch thick vertical PDU may require an additional 1–2 inches of space for cable management. Floor-mounted PDUs may also require extra depth for service access and maintenance. In summary, typical PDU thickness ranges from 1.5 inches for slim vertical units to over 7 inches for high-capacity horizontal or floor-mounted units, with the exact dimension depending on power rating, monitoring features, and installation type .
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