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What frequency is your electrical system?
50 Hz
60 Hz
Something else
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 Post subject: 50 Hz. or 60 Hz. System? Arc Flash Studies
PostPosted: Sun Oct 14, 2012 7:07 am 
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Joined: Mon Sep 17, 2007 5:00 pm
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Location: Scottsdale, Arizona
IEEE 1584 is used globally and is valid for both 50 Hz 60 Hz electrical systems. Since this is a global forum and both frequencies are found throughout the world, here is this week's question:

What frequency is your electrical system?
  • 50 Hz
  • 60 Hz
  • Something else

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Jim Phillips, P.E.
Brainfiller.com


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PostPosted: Mon Oct 15, 2012 8:37 am 
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Joined: Thu Jul 07, 2011 6:03 am
Posts: 67
Location: Netherlands
50 Hz almost all of the time. Once I encountered a interesting setup where UPS's acted as loads for other UPS's (to be load tested) that fed back into the supply. As a bonus these could be operating either at 50 or 60Hz. To be fair, frequency was the last of my headaches there.


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PostPosted: Wed Oct 17, 2012 8:47 am 
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Joined: Tue Apr 17, 2012 8:19 am
Posts: 250
Location: Charlotte, NC
The system at our facility is 60Hz, but we have customers all over the world and many of them have 50Hz systems. We deal with variable speed controls so in many cases it does not matter what frequency is coming into the converter, what is more important is what the frequency rating of the motor is.


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PostPosted: Thu Oct 18, 2012 4:16 am 

Joined: Wed Oct 17, 2012 2:01 am
Posts: 1
Hi Jim,
In the UK we are obviously on 50Hz, but we do have 208v Ph-Ph (115v Ph-N) 400Hz systems. Are the arc flash calculations still valid?
Thanks Rich


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PostPosted: Fri Oct 19, 2012 5:30 am 
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Joined: Wed Jun 02, 2010 12:59 pm
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Location: Milwaukee WI
I work on equipment that is sold to 50Hz and 60Hz sites, so I do both. And loads that can be specifically AC or DC. SKM Power*Tools accomodates the frequency selection easily enough.

So I'm not voting, unless I vote twice or select "something else".


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PostPosted: Fri Oct 19, 2012 6:22 am 
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AB P.E. wrote:
So I'm not voting, unless I vote twice or select "something else".

I considerred "something else" as well since our equipment is sold to 50Hz and 60Hz sites as well as to sites that convert DC from solar, wind, or wave power generation to AC grid power.


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PostPosted: Fri Oct 19, 2012 8:34 am 
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Larry Stutts wrote:
I considerred "something else" as well since our equipment is sold to 50Hz and 60Hz sites as well as to sites that convert DC from solar, wind, or wave power generation to AC grid power.

This week's question is set up for multiple answers so selecting 50 and 60 Hz. can be done.

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Jim Phillips, P.E.
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