In Sec. 610-33 for sizing the disconnect it says not less than 50% of the combined short-time ampere rating of the motors or less than 75% of the sum of the short-time ampere rating of the motors required for any single motion.
My questions is if you're sizing your conductors out of 610.14E and your crane has three motions and you only use two(100% of the largest and 50% of the next largest and omit the 3rd motion)is it 50% of the two that you used or all three? And if it's less than 75% of the sum of the motors for any single motion do I compare the 3 motions and take 75% of the largest motion? And what should one use for the short-time rating? Any illumination would be greatly appreciated.
My questions is if you're sizing your conductors out of 610.14E and your crane has three motions and you only use two(100% of the largest and 50% of the next largest and omit the 3rd motion)is it 50% of the two that you used or all three? And if it's less than 75% of the sum of the motors for any single motion do I compare the 3 motions and take 75% of the largest motion? And what should one use for the short-time rating? Any illumination would be greatly appreciated.