Alarm system in operation

Policy may warrant that an approved alarm system be kept in operation. In De Maurier (Jewels) Ltd v. Bastion Insurance Co. Ltd and Coronet Insurance Co. Ltd (1967), a warranty in a jewellers’ ‘all risks’ insurance stated ‘alarms on road vehicles be kept in operation… Held: ‘in operation means the system must be switched on in circumstances where the user has reason to believe that switching it on makes it fully operative. It does not mean “fully operative”. If, because of an unknown fault, it fails to operate there will be no breach of warranty by the insured.