:001_huh:Needing help with calc for installing a capacitor-
Have a 120/208 1200a MDP that's maxed out for breaker space for a 240v 3 wire 90kvar PF capacitor. The capacitor is a GE GMP50900D333FL. Am looking at tapping the MDP's 1200a buss and feeding a 400a fused switch. The conductor length is about 30'. Question is: Can 350thhn's feed this?
90kvar x .75= 67.5kvar for 208v rating
67.5 x 1000/ 208x1.73= 185.6amps
185.6a x 135% =253amps
350's @75*are 310amps...correct?
can the disconnect be fused at 400a since the capacitor has internal fusing, or do I need to drop the OCP to 300amps?
Have a 120/208 1200a MDP that's maxed out for breaker space for a 240v 3 wire 90kvar PF capacitor. The capacitor is a GE GMP50900D333FL. Am looking at tapping the MDP's 1200a buss and feeding a 400a fused switch. The conductor length is about 30'. Question is: Can 350thhn's feed this?
90kvar x .75= 67.5kvar for 208v rating
67.5 x 1000/ 208x1.73= 185.6amps
185.6a x 135% =253amps
350's @75*are 310amps...correct?
can the disconnect be fused at 400a since the capacitor has internal fusing, or do I need to drop the OCP to 300amps?
