Example 2: Understanding the PDU (three-phase WYE)

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Review the following example of Part 1 of the PDU planning process to understand the PDU characteristics for three-phase WYE PDU.

Part 1: Understanding specific PDU power characteristics

  • Maximum input phase current (protected by the wall breaker)
    Table 1. Maximum input voltage and amperage
    Example Line Cords Phase Voltage Derated Amperage
    1 220 - 240V AC 24A (80% of 30A line cord)
    2 220 - 240V AC 48A (80% of 60A line cord)
  • Output receptacle quantity and limitations
    • According to IEC 60320-1:
      • Each C13 receptacle is rated for up to 10A internationally (up to 15A in North America).
      • Each C19 receptacle is rated for up to 16A internationally (up to 20A in North America).
        Note: Current deratings may apply in some geographies and must be considered.
    • Each receptacle will be circuit breaker (CB) protected. Often more than one receptacle may share a 20A CB, so shared CBs must be carefully considered.
    • Receptacle groups are on a phase (L1-N, L2-N, L3-N) when line cord is a three-phase WYE.
      Example 1: Understanding the PDU (three-phase WYE), receptacle groups on PDU
  • Required level of redundancy
    Example 1: Understanding the PDU (three-phase WYE), required level of redundancy
    Notes:
    • Example only: 32A line cord in Europe (no derating).
    • Amperage of 32A is calculated as follows; 96A total effective output, if perfectly balanced.
      32A = 32A / √3