Number of low-voltage distribution spare outlet circuits in chemical plants and the criteria for determining them
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Dear everyone: How is the number of spare outlet circuits in the low- and medium-voltage distribution cabinets of chemical processing plants generally determined? What is the basis then? Those who know please offer advice! Thank you!
Does this sentence refer to the issue of reserved circuits? \"Low-voltage distribution devices should have no less than 20% spare outgoing circuits for each bus section; moreover, motors of different capacities should each have at least one spare outgoing circuit, and it is also advisable to reserve spare slots.\" What does it mean by \"it is also advisable to reserve spare slots\"?