Previous in Forum: Non-Loosening Motor Connection Box   Next in Forum: Clamp Meter to Find Current Drawn
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
8 comments
Rate Comments: Nested
nitish04
Participant

Join Date: Dec 2009
Posts: 1

Power Cable Temperature

12/10/2009 12:24 PM

Hi

i have two set of 3 ph power cable of same length connectd toseparate load of 20A. If i roll one cable from motor end for half meter like circle of 2 inch dia, and left other starighten then what will be difference in temperature at circle portion and starighted portion.
Register to Reply
Pathfinder Tags: Temp on cable
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: tempersture on power cable

12/10/2009 12:48 PM

If you have two sets of cables, measure the temperature difference.

Oh, yes. Please be sure and let us know what you discover.
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
charsley99
Guru

Join Date: Oct 2006
Location: New Jersey U.S.A.
Posts: 1114
Good Answers: 38
#2

Re: Power Cable Temperature

12/10/2009 2:47 PM

Sounds informative! Let me know what you find!

__________________
 The last fight was my fault. My wife asked "What's on the TV?" I said "Dust!"
Register to Reply
Tornado
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#3

Re: Power Cable Temperature

12/10/2009 10:26 PM

The coiled portion becomes an inductor, which is undesirable; higher temperature.

__________________
 In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
cwarner7_11
Guru
Panama - Member - New Member Hobbies - CNC - New Member Engineering Fields - Marine Engineering - New Member Engineering Fields - Retired Engineers / Mentors - New Member

Join Date: Dec 2006
Location: Panama
Posts: 4273
Good Answers: 213
#4

Re: Power Cable Temperature

12/10/2009 11:21 PM

If you DO detect a measurable temperature difference, you are most likely using the wrong gage wire for this application...
Register to Reply
JOSHIKD
Active Contributor

Join Date: Nov 2009
Posts: 20
#5

Re: Power Cable Temperature

12/10/2009 11:52 PM

if you form a coil of current carrying wire it will behave as inductor and offer inductance so it will offer more opposition to current flow and cable become hot
Register to Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#6

Re: Power Cable Temperature

12/11/2009 3:03 AM

In theory, the coiled cable should run slightly warmer. So slightly, that it shouldn't make any difference.

Practically, if there should be a measurable temperature difference between them then the coiled cable is either faulty or its cross-sectional area is too small.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Patrick Whowha
Power-User

Join Date: Nov 2009
Location: Nnewi,Anambra,Nigeria
Posts: 146
#7

Re: Power Cable Temperature

12/12/2009 5:35 AM

In circle portion u are making a coil which will bring about heat.Also u hv increased the resistance of the cable and hv a little opposed the flow of actual current to the load.

The result is that the circle portion cable will be warmer(heat increase) than the straightened cable.Further more if all conditions remain thesame,the straight cable will have a longer life span than the circled(coiled) one.

Patrick Whowha

__________________
 Patrick Whowha
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
dkwarner
Guru

Join Date: May 2006
Location: Placerville, CA (38° 45N, 120° 47'W)
Posts: 6215
Good Answers: 248
#8

Re: Power Cable Temperature

12/12/2009 12:43 PM

Regardless of the heat and induction losses, I consider a 2" diameter circle way too tight a loop for any cable big enough to carry 20 A 3Ø.

__________________
 Teaching is a great experience, but there is no better teacher than experience.
Register to Reply
Register to Reply
Have a Different Question?
8 comments

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

charsley99 (1); cwarner7_11 (1); dkwarner (1); JOSHIKD (1); lyn (1); Patrick Whowha (1); PWSlack (1); Tornado (1)

Previous in Forum: Non-Loosening Motor Connection Box   Next in Forum: Clamp Meter to Find Current Drawn
You might be interested in: pH Electrodes, pH Transmitters, pH Instruments

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (103 right now)
Show Members
Advertisement