Kelly,
You derate the cord with respect to the ampacity allowed by the receptacle it
connects to. Art. 210-23 of the NEC indicates that cord connected equipment can
draw no more than 80 % of the maximum receptacle rating.
Regards,
Wolf Josenhans
Kelly Tsudama <[email protected]> on 03/09/2000 09:33:14 PM
Please respond to Kelly Tsudama <[email protected]>
Sent by: Kelly Tsudama <[email protected]>
To: [email protected]
cc: (Wolfgang Josenhans/MW/US/3Com)
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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