Kelly:
The NEC is written to keep structures safe. Flexible cords used in structures
are normally used in free air.
If you are using a flexible cord in equipment, you need to rate its ampacity in
accordance with whatever standard you are using. The NEC relies on the NRTL
label and testing for the safety of equipment.
If you are using a flexible cord in a high ambient I would contact the mfg for
the appropriate derating.
Kelly Tsudama <[email protected]> on 03/09/2000 09:33:14 PM
Please respond to Kelly Tsudama <[email protected]>
To: [email protected]
cc: (bcc: Ed Rauch/MAIN/MC1)
Subject: Correction factor for power supply cords.
Hi Group
I am hoping that I can get your opinions with an issue regarding the correction
factor of power supply cords. For instance, in the NEC table 310-17, for single
conductors in free air, there is a chart at the bottom of the table that allows
you to determine how to factor in the ambient temperature. However, for a
flexible power cord, the table 400-5 does not have any correction factor table.
At first I thought that this is because cords always have a temperature rating
marked on them, but then I recall that most (if not all) single conductors have
this marking too.... Is there a need to "de-rate" a power cord's current rating
based on the expected ambient temperature? If so, where in the NEC did I miss
this fact? If not, why not?
Thanks for your help,
Kelly
****************************************************************
Kelly Tsudama
Cisco Systems
[email protected]
408-527-0216
408-525-9150 fax
408-322-9024 pager
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