ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Do you count seconds?
by gfretwell - 12/05/19 07:36 PM
"Esoteric" countries and their wiring practices?
by Texas_Ranger - 12/02/19 10:52 AM
Look at this mess...
by NORCAL - 11/15/19 10:21 PM
New in the Gallery:
FPE Breaker panel in germany
What is this for?
Who's Online Now
0 registered members (), 135 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
OT: CALCULATING temperature of a conductor. #196970 11/03/10 11:20 AM
Joined: Jul 2004
Posts: 783
L
LarryC Offline OP
Member
I am trying to come up with a method to calculate the maximum current one can push thru a conductor until you reach a predetermined temperature.

What is stumping me is the following: I know the conductor initial temperature, initial resistance, energy that has been put into the conductor (power x time), and the specific heat of the conductor. How can I relate all of this information to determine a final temperature?

Initially I am assuming DC or low frequency AC. Eventually I want to expand the model to include skin effect from higher frequency AC and variable duty cycle waveforms.

Work Gear for Electricians and the Trades
Re: OT: CALCULATING temperature of a conductor. [Re: LarryC] #196971 11/03/10 01:37 PM
Joined: Jul 2004
Posts: 9,414
G
gfretwell Offline
Member
I think you should start this by following the logic in the Neher–McGrath formula and work from there. Why reinvent the wheel?

This is from the handbook commentary in 310.15

Quote
A description of this calculation method was given in AIEE paper No. 5-660, “The Calculation of the Temperature Rise and Load Capability of Cable Systems,” by Neher and McGrath. This paper was presented to the AIEE general meeting in Montreal, Quebec, on June 24–28, 1956, and was published in AIEE Transactions, Part III (Power Apparatus and Systems), Vol. 76, October 1957, pp. 752–772. The AIEE (American Institute of Electrical Engineers) is now the Institute of Electrical and Electronics Engineers (IEEE).


You can probably find this paper on the net somewhere.


Greg Fretwell
Re: OT: CALCULATING temperature of a conductor. [Re: gfretwell] #196975 11/03/10 03:28 PM
Joined: Jul 2004
Posts: 783
L
LarryC Offline OP
Member
Thank you.

Google here I come.


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
HotLine1
HotLine1
Brick, NJ USA
Posts: 7,123
Joined: April 2002
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
261,202 Are you busy
196,355 Re: Forum
185,623 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3