The goal of the research was to reduce the number of external trigger cables needed to trigger the oil insulated LTD cavity. The usual trigger circuit inside LTD cavity is a single wire O-ring and the minimum number of the external trigger cables connected to this O-ring is determined as 1 cable per 10 switches. In recent article LTD cavity of 34 bricks with novel trigger system and special internal trigger brick was represented. In our tests similar trigger system was used but without the

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... nal trigger brick. The LTD cavity of 16 bricks was tested in more than 3000 shots. In all these shots no malfunction was observed. Numerical simulation has shown that up to 40 switches might be successfully triggered by 1 external trigger cable by using both the novel trigger system and a simple wire O-ring. This last prediction was tested in experiment with LTD cavity of 16 bricks in 600 shots and no malfunction was observed also. The results of this research have shown that previous requirement can be reduced to less strict claim of 1 trigger cable per 16 switches.