Hi umi and other forum members and users:

According to the official definitions of the NATIONAL FIRE PROTECTION ASSOCIATION taken from the NFPA Glossary of Terms (2004)

Standard
A document, the main text of which contains only mandatory provisions using the word "shall" to indicate requirements and which is in a form generally suitable for mandatory reference by another standard or code or for adoption into law. Nonmandatory provisions shall be located in an appendix or annex, footnote, or fineprint note and are not to be considered a part of the requirements of a standard.

Code
A standard that is an extensive compilation of provisions covering broad subject matter or that is suitable for adoption into law independently of other codes and standards.

Regards