ground fault study

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tw/nci

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where would I be able to find information about a "ground fault study" for electrical gear. I am trying to understand how this works as well as how to properly determine the corrective "cal for PPE" thanks in advance
 
StephenSDH

StephenSDH

Senior Member
Location
Allentown, PA
You mean Arc Flash study. You need to hire an engineering company to perform the study. It isn't a simple lookup table. The engineering company with determine the incident energy after doing a plantwide survey. From there you can look at NFPA 70E 2009 section 130 to determine what you should wear based on the voltage and incident energy.

Read over Section 130 it is available online for free below.

NFPA 70E
http://nfpaweb3.gvpi.net/rrserver/browser?title=/NFPASTD/70E09
 
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TxEngr

Senior Member
Location
North Florida
There are tables available to use if your facility meets certain requirements. In order to determine if you meet those requirements, you will need information from the utility and information about your distribution system to do a basic calculation. If you fall into the requirements, you can use the tables found in 70E and label your equipment accordingly. If not, you will need to do a full arc flash study and then apply labels based on that. In either case, you will probably need to employ an outiside engineer to do the basic calculation. Just make sure you understand that an option is available if you fit, and the high cost of an arc flash study may not be necessary.

TxEngr
 
C

CWillcox

Member
Location
New Paris, OH
Might need short circuit & coordination study's

Might need short circuit & coordination study's

Depending on your location and what you are doing, OSHA requires a documented short circuit & coordination study.
1910.303(b)(4) & (5)
Then you will know if you can follow the tables or need a complete Arc Flash study completed. Granted, OSHA put in several exceptions but most of the commerical / industrial facilities will need this.
 
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