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ANSI/CPLSO-14
ANSI/UL2737 (Withdrawn)
ASTM F2973
MIL-L-24410 (Withdrawn)
Tests by Independent Organizations
Load Insulator
Miller & Hirtzer
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Page 8 of 13 CPLSO Procedures for the Development and Coordination of Standards (ANSI Approved: 11th December 2018) Annex B – Metric policy Units of the International System of Units (SI), the modernized metric system, are the preferred units of measurement in American National Standards. All standards will contain appropriate International System of Units (SI) units for each measure accompanied by units. U.S. Customary (inch‐pound) units may be the primary unit following a value, but an SI equivalent value and unit must follow the customary value and unit. For example, a measurement of twelve inches may be shown as 12” (304.8 mm). Customary measurements may be converted by hard or soft conversion. A soft conversion recalculates the measure in metric terms (e.g. an item with a 12 inch measurement does not change size, but is measured as 304.8 millimeters). A hard conversion actually requires physical change to match a rounded metric value (e.g. a two quart measurement may be hard converted into 2 liters). Soft conversions may also be made as rational equivalents. A rational equivalent conversion rounds a measurement to the nearest appropriate metric rounded value without significantly changing the value. For instance, the rational equivalent for a twelve inch measurement may be shown as 300 mm rather than 304.8 mm. Soft conversions do not need to be identified, but hard conversions must be identified with the words “hard conversion” following the conversion value. For example, a measurement of two quarts, hard converted to two liters may be shown as 2 qt. (2 L, hard conversion). Whenever any hard conversion is contained in a standard, the standard must contain an explanation of the term “hard conversion”. The following is suggested language to be contained in a standard regarding hard conversions: Hard conversion: The process of converting U.S. customary units into nonequivalent metric units, possibly significantly changing the measure. Hard conversion is used to simplify the measurement and use standardized metric measures that are functionally equivalent. Hard conversion may also be referred to as size substitution.
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