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The latest IEEE Standard 1584 Guide for Performing Arc-Flash Hazard Calculations includes five different possible bus configurations in order to more accurately model different kinds of equipment. These configurations include three in-box types and two open-air types.

  • vertical conductors in a box (VCB)
  • vertical conductors with barrier in a box (VCBB)
  • horizontal conductors in a box (HCB)
  • vertical conductors in open air (VOA)
  • horizontal conductors in open air (HOA)