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WHY IS THE SIZE OF HOLE OF THE EARTH POINT IN THE PLUG
POINT BIGGER THAN PHASE AND NEUTRAL
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Answer Posted / kk_london
I will give u simple example, the tank containing water
with small tap and the other tank with same capacity of
tank and water with big tap. If we open the taps at the
same time the tank with the bigger tap will drain out first
same logic applies to size of hole of the earth point in
the plug.
| Is This Answer Correct ? | 3 Yes | 5 No |
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We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?
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