Lapopez,
Rita C quoted from the MLBUM and that is the best source for rules interpretations. However, it is not available publicly. The PBUC Umpires Manual, which is the manual used in the minor leagues, is not as comprehensive as the MLBUM, but much of the content is the same. In particular, your question is answered in the PBUC manual, using (for the most part) language which is identical to the MLBUM. It is available from the PBUC for $20, including shipping.
http://web.minorleaguebaseball.com/m...c=_ump_manuals
You may also be able to find it at various online suppliers of umpiring equipment. Both Gerry Davis and Jim Evans list it as available on their websites.