Related Rule
Cameroon
Practice Relating to Rule 42. Works and Installations Containing Dangerous Forces
Section A. Attacks against works and installations containing dangerous forces and against military objectives located in their vicinity
Cameroon’s Instructor’s Manual (1992) defines installations containing dangerous forces as “dams, dykes and nuclear power stations whose destruction may lead to severe losses among the civilian population” and states that they lose their protection against attack “when they are used as tactical support by the belligerents”. 
Cameroon, Droit international humanitaire et droit de la guerre, Manuel de l’instructeur en vigueur dans les Forces Armées, Présidence de la République, Ministère de la Défense, Etat-major des Armées, Troisième Division, Edition 1992, p. 20, § 226.
Cameroon’s Instructor’s Manual (2006) states:
352.2 – Special protection: (persons and objects specially protected.)
Certain categories of persons and objects benefit from special protection under the law of armed conflict and international humanitarian law, both in the civilian domain and in the military domain.
352.26 Installations containing dangerous forces
[Such installations refer] to dams, dykes and nuclear power stations whose destruction may lead to severe losses among the civilian population. 
Cameroon, Droit des conflits armés et droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces de défense, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, p. 92, § 352.2 and p. 94, § 352.26; see also pp. 134, § 412.2, p. 136, § 412.26 and p. 230, § 543.
The manual also states that “attacks against works or installations containing dangerous forces, knowing that these attacks will cause excessive damage to civilians” constitute grave breaches of IHL. 
Cameroon, Droit des conflits armés et droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces de défense, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, pp. 295–296, § 661.