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Old 09-18-2012, 09:54 AM   #16
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industrial motor circuit


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Originally Posted by electures View Post
Rob,

I disagree. The motor brach circuit conductors have to be sized at 125% of the motor FLA using Table 430.250.

361 x 125% = 451.25A

700 KCMIL THHN CU (rated 460A) per conductor if three are used.

250 KCMIL THHN CU x 2 per phase if two sets of paralleled (6 conductors in one conduit).

250 KCMIL THHN CU are rated 290A x 2 = 580A x 80% = 464A
You are correct.

In all the motor calculations I've done, this time I failed to include the 125%.

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Old 09-18-2012, 12:05 PM   #17
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industrial motor circuit


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Originally Posted by micromind View Post
You are correct.

In all the motor calculations I've done, this time I failed to include the 125%.
Its okay. No one is perfect. No one.
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Old 09-19-2012, 03:10 PM   #18
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industrial motor circuit


The compressor has a controller panel with a softstart installed. Does this change any of the parameters?
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Old 09-19-2012, 04:01 PM   #19
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industrial motor circuit


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Originally Posted by scott.cameron
The compressor has a controller panel with a softstart installed. Does this change any of the parameters?
No. All good.

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