Oil-filled composite outdoor terminations represents today’s state of the art. They are designed, manufactured, and installed with the highest technology standards; nevertheless, an accidental event like an internal arc may occur due to several reasons. One approach to reducing the risk is to minimize the consequential damage of such an event. Brigg’s design for an explosion-resistant composite outdoor termination represents the most reliable way to minimize damage and therefore risks. Design and testing activities are reported in this article.