4. Safety distance categories of explosives. - (1) Explosives are divided into four categories according to the risks, which they present when initiated, namely (i) Category X - Those explosives, which have a fire or a slight explosion, risk or both but the effect of which will be local. (ii) Category Y - Those explosives, which have a mass fire risk or a moderate explosion, risk, but not the risk of mass explosion. (iii) Category Z - Those explosives, which have a mass explosion, risk and major missile effect. (iv) Category ZZ - Those explosives, which have mass explosion, risk and minor missile effect. (2) If any question arises as to whether any explosive belongs to Category X, Category Y, Category Z or Category ZZ, the matter shall be referred to Chief Controller whose decision shall be final.
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