Philippines
Practice Relating to Rule 10. Civilian Objects’ Loss of Protection from Attack
The Philippines’ AFP Standing Rules of Engagement (2005) states:
8. General Rules for the Correct Use of Force towards Mission Accomplishment

g. … public utilities and other non-military structures, shall be protected and shall not be attacked except when they are used for military purposes. 
Philippines, AFP Standing Rules of Engagement, Armed Forces of the Philippines, General Headquarters, Office of the Chief of Staff, 1 December 2005, § 8(g).

The Philippine Army Soldier’s Handbook on Human Rights and International Humanitarian Law (2006) notes in its glossary:
Civilian objects – any object which is not a military objective. Objects which are normally civilian objects can, according to the military situation, become military objectives (e.g. house or bridge tactically used by the defender and thus a target for an attacker). In case of doubt whether an object which is normally dedicated to civilian purposes (e.g. a place of worship, a house or dwelling, a school) is a military objective or not, it shall be considered as a civilian object. 
Philippines, Philippine Army Soldier’s Handbook on Human Rights and International Humanitarian Law, A Practical Guide for Internal Security Operations, 2006, p. 67, Glossary.

The Philippine Army Soldier’s Handbook on Human Rights and International Humanitarian Law (2006) notes in its glossary:
Civilian objects – any object which is not a military objective. Objects which are normally civilian objects can, according to the military situation, become military objectives (e.g. house or bridge tactically used by the defender and thus a target for an attacker). In case of doubt whether an object which is normally dedicated to civilian purposes (e.g. a place of worship, a house or dwelling, a school) is a military objective or not, it shall be considered as a civilian object. 
Philippines, Philippine Army Soldier’s Handbook on Human Rights and International Humanitarian Law, A Practical Guide for Internal Security Operations, 2006, p. 67, Glossary.