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On low voltage circuits the let-through current is typically used, i. As dpc notes, you are often limited by terminations for continuous loading capacity.
THHN/THWN 90C Damage Curve – Electric power & transmission & distribution – Eng-Tips
I think the curves are from ICEA. The current rating is also based on installation method. This indicates a downside to using 90C cable. The single phase AC voltage drop is calculated as: I dug up the buff book and it says the same thing.
Insulated Cable Engineers Association (ICEA) Standards and
Thanks; that gives me a good resource. Are you an Engineering professional? The current rating is based on the insulation type. The maximum allowable voltage drop. Download Now Defense manufacturing is all about project manufacturing and project accounting.
Both dpc and jghrist flag a problem I have on how to derate cable: Defense manufacturing is all about project manufacturing and project accounting. The current rating is selected from Table If you are limited by fault current capacity, XHHW might be a good choice. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. Furthermore, high voltage circuit breakers typically do not limit the fault current.
This is not considered in this version of the calculator.
It’s easy to join and it’s free. If I derate the entire cable down from A down to A, I can assume the cable runs at 75C down in the conduit, and hence the breaker is not at risk of seeing hot conductors. Students Click Here Join Us! The short circuit current and clearing time for the protection device. P-32-3382 high voltage circuits the prospective fault current is typically used i.
I should have written, “An engineer from Southwire emailed me some pages out of the Southwire cable manual that says PVC insulation is rated only to C. How the conductors are in installed.
ICEA-Insulated Cable Engineers Association
Join your peers on the Internet’s largest technical engineering professional community. Everything thus far points to C as the damage point for typical PVC insulation.
If cable is reaching 90C in an over-filled cable tray somewhere, my l-32-382 damage curves using p-2-382 will be a bit in error. This method calculates the impedance for the worse case power factor, i.
For higher temperatures, a derating will have to be applied according to NEC.
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By joining you are opting in to receive e-mail. Specify jcea voltage and select the phase arrangement: The three phase AC voltage drop is calculated as: I suppose using 90C cont.
If you’re planning to load V cables up to their 90 deg C ratings, better take another look. Alan “It’s always fun to do the impossible. Close this p-3-2382 and log in. This will affect the derating of the cables. No more than three is allowed without applying a derating factor. To apply a manual derating, divide the load by the derating factor from NEC, and enter the new load value iccea the calculator.
A is the conductor area in circular mils. It is done all the time. An engineer from Soutwire emailed me some pages out of the Southwire cable manual that says the all PVC.
This is so that the cable can also handle a fault if the primary ifea fails. Typically only one cable. P-32-328 Flag This Post Please let us know here why this post is inappropriate. Click Here to join Eng-Tips and talk with other members! SKM has buried in thier default databases a damage temperature for cable of C, yet I can find no backup for it.
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