NEC 610.14(A) cranes and hoists feeder size

[Isaiah]

I’m still a little confused with 610.14(A).
Let say I have one large motor, 460V crane motor 3 ph at 125FLA.
And 4 smaller 460 V 3ph motors - 2 @ 11FLA and 2 @ .5 A
And one 480V, 3 ph 45kVA Transformer at 54A
Along with a few miscellaneous loads such as CPTS etc of around 20A
The total is about 222A
All motors are non-continuous, short time duty If I size the fuses at 250A can I run #3/0 cable using the 75 degree column (280 A) of 610.14(A) from disconnect switch to the hot rails?


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[Dale001289]

I’m still a little confused with 610.14(A).
Let say I have one large motor, 460V crane motor 3 ph at 125FLA.
And 4 smaller 460 V 3ph motors - 2 @ 11FLA and 2 @ .5 A
And one 480V, 3 ph 45kVA Transformer at 54A
Along with a few miscellaneous loads such as CPTS etc of around 20A
The total is about 222A
All motors are non-continuous, short time duty If I size the fuses at 250A can I run #3/0 cable using the 75 degree column (280 A) of 610.14(A) from disconnect switch to the hot rails?


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The motor loads are short time non continuous but other loads, such as control panels should be considered continuous.
So, you can’t just replace 310.16 with 610.14(A). It’s a mixture thereof which makes it problematic to size the feeder from the OCPD.


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