![]() ![]() My barricades need to be set up at 2.22 meters or about 7 1/2 feet. How far away do I need to place my barricade? We know from our rule of thumb that this will take 0.1 seconds. So if an arc flash were to occur when I was racking out the feeder breaker then I’m relying on the main breaker to trip. Above that is a transformer with an MVA equal to 10. Let’s say I’m racking out a 5kV circuit feeder breaker that is fed by another 5kV circuit breaker (which I’ll refer to as the main breaker).
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