You are not registered yet. Please click here to register!

plc storereviewsdownloads
This board is for PLC Related Q&A ONLY. Please DON'T use it for advertising, etc.
Try our online PLC Simulator- FREE.  Click here now to try it.

New Here? Please read this important info!!!

Go Back - Interactive Q & A > - Interactive Q & A > LIVE PLC Questions And Answers

Thread Tools Display Modes
Old July 29th, 2014, 11:09 AM   #1
United States

MHennel is offline
Join Date: Jun 2002
Location: Cincinnati, OH
Posts: 53
Arc Flash Single Phase

I have an enclosure that has 24VDC in it except for a Graceport programming port mounted on the door that has a 120VAC receptacle on it for a powering a laptop with the door closed. I am trying to determine what if any effect the terminals on the back of the Graceport have to the Arc Flash category and incident boundary. The receptacle is feed from a 1kVA transformer in a separate enclosure that has a 5A circuit breaker in front of it. I can find nothing on calculating Arc Flash on a 120VAC single phase system. Does anyone have information on how to calculate the Arc Flash boundary for something like this. Until 2009 anything feed by a single transformer of less than 125kVA were not required to be evaluated for Arc Flash risk.
  Reply With Quote
Old July 29th, 2014, 11:57 AM   #2
Lifetime Supporting Member
United States

RussB is offline
RussB's Avatar
Join Date: Oct 2003
Location: Michigan
Posts: 2,909
I gotta watch this one.

What is this world turning into?
LEARN something today so you can TEACH something tomorrow.
DETAIL in your question promotes DETAIL in my answer.
Dominus Vobiscum <))>(
"Where is the wisdom that we have lost in knowledge?" T.S. Elliot

  Reply With Quote
Old July 29th, 2014, 05:13 PM   #3
Lifetime Supporting Member
United States

Lancie1 is offline
Lancie1's Avatar
Join Date: Jul 2003
Location: Alabama
Posts: 9,999
If the 120 volt AC terminals on the back are insulated or covered, then the Risk Category is 0. If they are exposed, it goes up to 1, depending on the type of work to be done in the area according to NFPA Table 130.7(C)(9).
  Reply With Quote
Jump to Live PLC Question and Answer Forum


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Topics
Thread Thread Starter Forum Replies Last Post
OT: Single Phase to 3 Phase Inverter MarkNightingale LIVE PLC Questions And Answers 16 May 1st, 2014 07:11 PM
Anyone experienced using a larger (11kW,15hp) VFD 3 phase using only single phase in? Sliver LIVE PLC Questions And Answers 17 August 13th, 2013 05:46 PM
motor efficiency: single phase vs. 3 phase vfd RH68 LIVE PLC Questions And Answers 30 July 18th, 2009 07:27 PM
what are the advantages for three phase power supply than single phase power supply ? magdyfayad LIVE PLC Questions And Answers 6 October 28th, 2008 03:42 PM
Mechanical/Material Handling and ISA 88 rlmunoz LIVE PLC Questions And Answers 6 December 25th, 2002 03:49 AM

All times are GMT -4. The time now is 10:14 AM.