The Company shall not be liable for:
1- The deductibles stated in the Schedule to be borne by the Insured;
2- Damage and/or liability caused by the wilful act or omission or gross negligence of the Insured or his representatives;
3- Defects due to the wearing away or the wasting of the materials of a boiler or a pressure vessel, whether by leakage, corrosion or by the action of the fuel or otherwise, the grooving or the fracturing of any of the parts of a boiler or pressure vessel, or for deterioration generally, or for the development of cracks, blisters, laminations and other flaws, or for fractures, failure of joints or for bulging and deformation due to overheating of tubes (unless such defects, fractures, failures or bulging result in explosion or collapse), or for cracking of sections of cast-iron heating boilers or other vessels constructed of cast-iron.
4- The failure of individual tubes in boilers of the water tube, locomotive or other multi-tubular types, in superheaters or in economizers (unless such defects result in explosion or collapse);
5- Damage to property belonging to the Insured or held by him in trust or on commission for which he is responsible, caused by fire arising from explosion or collapse or any other cause whatsoever, or damage to the plant resulting from any extraneous cause;
6- Loss sustained by stoppage of work;
7- Loss or damage which either in origin or extent is directly or indirectly, proximately or remotely occasioned or contributed to by any of the following, namely:
a/- typhoon, hurricane, volcanic eruption, earthquake or other convulsion of nature,
b/- loss or damage directly or indirectly caused by or arising out of war, invasion, act of foreign enemy, hostilities (whether war be declared or not), civil war, rebellion, revolution, insurrection, mutiny, riot, strike, lock-out, civil commotion, military or usurped power, or malicious persons acting on behalf of or in connection with any political organization, confiscation, commandeering, requisition or destruction of or damage to property by order of the government de jure or de facto or by any public authority.
c/- any tests other than tests at a pressure not exceeding the maximum pressure permitted by the inspecting authority.
8- Any loss, destruction, damage or legal liability directly or indirectly caused by or contributed to by or arising from nuclear weapons material or radioactive contamination;
In any action, suit or other proceeding where the Insurers allege that by reason of the provisions of exclusions above any loss, destruction, damage or liability is not covered by this insurance the onus of proving that such loss, destruction, damage or liability is covered shall be upon the Insured.