( a ) Persons detained pending preliminary investigation before a judge of the Court of First Instance or pending trial before the Court of First Instance. ( b ) Persons who by reason of their sentence may be deprived of liberty for not more than one year or are subjected to a fine of not more than five hundred pesos, or are subjected to both penalties; but if a prisoner receives two or more sentences in the ag gregate exceeding the period of one year, he shall not be considered a provincial prisoner. The imposition of subsidiary imprisonment shall not be taken into consideration in fixing the status of a prisoner hereunder except when the sentence imposes a fine  only. [1703-3.] [1732-2.] SECTION  1954 . Insular Prisoners . — Prisoners who are neither municipal nor provincial prisoners shall be considered Insular prisoners, among whom shall be reckoned, in any event, all persons sentenced for violation of the Customs Administrative Law or other  law within the jurisdiction of the Bureau of Customs or enforceable by it. [1703-5.] SECTION  1955 . Confinement of Provincial Prisoners in Municipal Jails . — When the sentence of a provincial prisoner does not exceed three months, the provincial board may authorize his confinement during such period in a municipal jail if in the judgment of  said board the public interest will be subserved thereby. [2454-2.] Provincial boards may, also, with the approval of the Governor-General, direct the confinement of persons detained pending preliminary investigation before a judge of the Court of First Instance or pending trial before the Court of First Instance, in the j ail of the municipality where such investigation or trial is to be held, if no provincial jail be located therein. [2454-1.] SECTION  1956 . Confinement of Municipal Prisoners in Provincial Jails . — Provincial boards may, with the approval of the Governor-General, direct the confinement of municipal prisoners in provincial jails when by reason of the lack, inadequacy, or insecurity  of municipal jails such action becomes necessary, or Copyright 2012 CD Technologies Asia, Inc. and Accesslaw, Inc. Philippine Law Encyclopedia 2011 579