Section 2.4 - GENERAL CONVENTIONSThe following conventions apply when using 521 CMR:
2.4.1 Graphic and other illustrations are provided in 521 CMR to illustrate a solution only. They are not to be taken as the best solution or the only solution, but are provided to clarify the intent of the written regulations. The written word always prevails.2.4.2 Graphic conventions are shown in Figure 2a. Dimensions that are not marked minimum or maximum shall comply with 521 CMR 2.4.4, unless otherwise noted in the text or captions. Click to view image
2.4.3 Words italicized in the text indicate that a definition of that word is provided in 521 CMR 5.00: DEFINITIONS.2.4.4 Tolerances on all dimensions, unless otherwise noted, shall not exceed the following: a. Dimensions between zero and two inches, (0" and 2" = 0mm and 51mm) inclusive, shall have a maximum tolerance of plus or minus one-eighth inch (1/8" = 3mm).b. Dimensions more than two inches and less than 36 inches (>2" and <36" = >51mm and <914mm) shall have a maximum tolerance of plus or minus one-half inch (1/2" =13mm).c. Dimensions 36 inches or greater (36" or > = 914mm or >) shall have a maximum tolerance of plus or minus one inch (1" = 25mm).d. Slopes may not exceed maximums. Slopes shall be measured in two-foot increments. Note: Tolerances do not apply to minimums or maximums.
2.4.5 When a percentage is calculated to determine the number of accessible elements, if the number ends in a fraction of five-tenths (.5) or more, the number shall be rounded up to the next whole number. If the number ends in a fraction less than five-tenths (.5), the number shall be rounded down.2.4.6 When calculating the conversion from inches to millimeters (using 1"=25.4mm), if the number ends in a fraction of five-tenths (.5) or more, the number shall be rounded up to the next whole number. If the number ends in a fraction less than five-tenths (.5), the number shall be rounded down.