" Non-Contributory" bedeutet, dass keine Leistungspflicht anderer Versicherungen besteht. Die Erstversicherung kommt für den vollen Schadensbetrag auf (d.h. bis zum Limit natürlich), und andere Versicherungen werden zur Begleichung des Schadens nicht in Anspruch genommen


"noncontributing, noncontributory
Insurance issued on the basis that it will not seek contribution from other insurance policies that apply to a covered loss on the same basis (e.g., primary). Requests for additional insured status sometimes specify that it be provided on a noncontributing or noncontributory basis. The additional insured in such cases is seeking assurance that its own policy will not be asked to contribute to a covered loss."
http://www.irmi.com/online/insurance-glossary/terms/n/noncon...


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Note added at 1 hr (2010-01-26 22:04:27 GMT)
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Beispiel:
Joe Construction subs out some work to Jack's Plumbing, requesting this wording. It means, if Joe Construction is sued, Jack's Plumbing's GL policy covers. They pay first (primary), and Joe Construction's policy doesn't have to kick in (non-contributory).