Previous in Forum: Spark Gap in Grounding System   Next in Forum: PCB Fabrication
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
6 comments
Rate Comments: Nested
felixsemion
Active Contributor

Join Date: Apr 2009
Posts: 18

Power Supply for LED Screen

05/18/2009 10:21 PM

I'm installing LED screen 7200w(current load). Can I use cable with sized 95 sq.mm and length 230m. Kindly assist
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

These comments received enough positive votes to make them "good answers".
2
wareagle
Guru
United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#1

Re: power supply

05/18/2009 10:53 PM

Felix

Haven't we been over this in your other post? Your previous post said

"what's the minimum cable size to accommodate appliances with 42.3kw. I am installing LCD which requires 42.3kw and the contractor proposed 95sq.mm. I think it is too big which I presume 70sq.mm will be sufficient enough. Please assist"

You still have not told us what the voltage is. Is it 120 volts or 240 volts? The chart at this site shows cable ampacity http://www.energy-solutions.co.uk/cable_conductor.html

If the voltage is 240 volts the cable size your are suggesting is much too large. At 240 volts the load is only 30 amps. The chart shows 70 sqmm has an ampacity of 265 amps. Before we go any further you need to provide the correct voltage. You may have a voltage drop problem.
Register to Reply Good Answer (Score 2)
No more Good Answers.
Anonymous Poster
#3
In reply to #1

Re: power supply

05/20/2009 3:49 AM

Hi Wareagle,

Both of these standards in the link only refer to vessels up to 24m hull length. Although these current densities would probably be ok for most terrestrial application it may be neccesary for the poster to refer to standards related to wiring in public buildings if that is where his screen will be sited. The standard there may be quite stricter.

regards

Chas
Register to Reply
wareagle
Guru
United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#4
In reply to #3

Re: power supply

05/22/2009 5:52 PM

I does not matter whether this is a cruise ship or an out house. We can not answer the question until Felix tell us what the VOLTAGE is.

FELIX what is the voltage?
Register to Reply
felixsemion
Active Contributor

Join Date: Apr 2009
Posts: 18
#5
In reply to #1

Re: power supply

05/22/2009 9:47 PM

We are using 240volts and the maximum current load of this LED Giant Screen is 50kw. Will this 90 sq.mm cable sufficient to accomodate current
Register to Reply
wareagle
Guru
United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#6
In reply to #5

Re: power supply

05/28/2009 5:25 PM

50 kw at 240 volts gives amps = 208 amps. You need to check the distance to ensure voltage dop is not a problem. The site below shows 95 mm2 70C cable has an ampacity of 330 amps. 90mm2 is not listed.

http://www.energy-solutions.co.uk/cable_conductor.html
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
#2

Re: power supply

05/19/2009 3:01 AM

What VOLTAGE? Kindly supply all the information!

__________________
 "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
Register to Reply
Have a Different Question?
6 comments

Good Answers:

These comments received enough positive votes to make them "good answers".
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); felixsemion (1); PWSlack (1); wareagle (3)

Previous in Forum: Spark Gap in Grounding System   Next in Forum: PCB Fabrication

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 (86 right now)
Show Members
Advertisement