I sent you the 2001 NFPA Style Manual. See Section 2.6 Exceptions.
2.6.1 Placement and Order. Exceptions shall
immediately follow the main rule to which they apply.
Exceptions containing the mandatory terms shall or shall not are to be listed first in the sequence.
Permissive exceptions containing shall be permitted are to follow any mandatory exceptions and be listed in their order of
importance as determined by the Code-Making Panel.
2.6.2 Numbering. Where there are two or more
consecutive exceptions, each shall be numbered.
