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For 300V from MIL Std275b you'd need at least 3.17mm distance between traces for cat Ib below 3048m above sea level. The gap in between cardslot pins is only 1.7mm. For cat Ia (no humidity condensating/dry and non conductive pollution) you could get away with 1.58mm, but that might not be realistic at an open air venue... just saying


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