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Recommended spare capacity above the expected load for the power distribution system of all electrical equipment?

asked Jul 13, 2014 in E&I by antonjoh (2,870 points)
What is the recommended spare capacity above the expected load for the power distribution system of all electrical equipment (main and emergency generators, transformers, switchgear, UPS, DC systems, etc.)?

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answered Jul 13, 2014 by josvanden (2,940 points)
Propose to include power generation equipment sized to provide at least 20% spare capacity above the expected load.  The expected load should be defined to include the maximum running load exclusive of stand-by motors. With that said, no design margin is established for the provision of online transfer of the largest motor.
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