This publication describes how to convert degree-hour measures of over-temperature (OT) allowances to hours within a defined temperature range. Additionally, it will be shown how to derive the appropriate Hour Conversion Ratio (HCR) to convert a number of hours in a higher temperature Tier to an equivalent number in a lower Tier for accounting purposes. Finally, the division of Tiers into smaller Mini-Tiers is described. Mini-Tiers are used to provide a finer granularity which allows more economical "expenditure" of the allocated OT allowances.
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