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Update - Motor Wire and Protection Chart |
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Here’s an update to our December 8 newsletter that provided you with a Motor Wire and Protection Chart. Based on your comments, Mike has updated the chart to include Fuse Protection.
Click here to download it - print it out, give it a go, and if there’s further feedback let us know.
Note: Voltage drop is not an NEC requirement
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| Copyright© Mike Holt Enterprises of Leesburg, Inc. All Rights Reserved This article is protected by United States copyright laws and may not be published without prior written permission. |
| Mike Holt Enterprises of Leesburg, Inc. 3604 Parkway Blvd. Suite 3 Leesburg, FL 34748 |
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"... as for me and my house, we will serve the Lord." [Joshua 24:15]
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| Comments
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Table 430.248 said 3/4 hp 115 V will take 13.8 Amps.
When you do calculation 3/4 HP is 560 Watts.
560 Watts : by 115 V = 4.8 Amps.
Please explain how this work ?
Thanks
David David Murar June 19 2019, 1:43 am EDT
Reply to this comment |
Reply from: Mike Holt June 19 2019, 2:06 pm EDT
See: youtube.com/embed/Sic1uoua3og
And: youtube.com/embed/2cprO8ZdT1U
Reply to Mike Holt |
I have a 208/480 75kva step up transformer the machine calls for a 50amp 3phase 480vc and a 20amp Vc 480vc . My question is what size should my breaker be on the primary side of the transformer thanks Arthur December 31 2015, 5:19 pm EST
Reply to this comment |
Reply from: Mike Holt January 4 2016, 1:18 pm EST
Questions not related to the Newsletter need to be posted on the Code Forum at www.MikeHolt.com. But your answer is contained in 450.3(B).
Reply to Mike Holt |
Mike,thank you for all you share, your contributions to the
industry are priceless. You have made me a better Electrician.
HAPPY NEW YEAR, All The Best.
BR
MM Michael McKeon December 31 2015, 5:07 pm EST
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Voltage drop is an International Energy Conservation Code (IECC) requirement. David A Engelhart December 31 2015, 11:43 am EST
Reply to this comment |
Column 5b is not displayed (Raceway sized to accommodate four full-size conductors - three ungrounded conductors and one EGC). Thomas Roberts December 31 2015, 10:59 am EST
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Reply from: Mike Holt December 31 2015, 4:27 pm EST
I updated the table, sorry... should have it uploaded early next week.
Reply to Mike Holt |
There's no 5b raceway column but you show it in the notes. Sean December 31 2015, 9:43 am EST
Reply to this comment |
Reply from: Brian December 31 2015, 9:47 am EST
I think the 5b should go on the second page with the 3 phase motors.
Reply to Brian Reply from: Mike Holt December 31 2015, 4:25 pm EST
You are correct, the new table will be uploaded early next week. Sorry, and happy New Year.
Reply to Mike Holt |
240.6 tells that "Additional standard ampere ratings for fuses shall be 1, 3, 6, 10 and 601. Note that for small motors, for example 1/2HP, 460V, 3-ph, FLC = 1.1A. I think that for those cases, the correct OCP shall consider the use of the small-ampere rating fuses mentioned in 240.6 Jacob Mendelovici December 30 2015, 9:34 pm EST
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Reply from: Mike Holt December 31 2015, 8:02 am EST
You are 100% correct, I'll be sure the corrected file get uploaded as soon as the office is open.
Reply to Mike Holt |
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