The code book is divided into numbered parts, each of which covers a different aspect of electrical work. The section number is represented by the first two digits of the rule number before the hyphen, which is RULE 00-000. With the Symbols and Conversion Factors for SI Units chart, you may convert celsius to fahrenheit or millilitres to cubic inches, among other things. When a rule is changed, it will be indicated with the delta sign ‘∆’ in the margin. On page xxx of the code book’s first section, there is a table that provides the metric trade designator for conduit and its counterpart in English. the diameter of the conduit in inches