It is currently Thu Feb 22, 2018 3:33 am



Post new topic Reply to topic
Author Message
ekstra   ara
 Post subject: Labels For Equipment That Is Plugged In
PostPosted: Thu May 28, 2015 6:16 am 
Offline

Joined: Fri Feb 13, 2015 9:27 am
Posts: 8
Location: Hendersonville, TN
When you guys are doing your studies how do you handle equipment that is plugged in? Say you have SO cord dropped from a 480v bus duct and the equipment is plugged in but has a disconnect on the side of it. Does this disconnect need a arc flash label? Does it matter if the equipment is on wheels and could be moved and plugged in at another location where the IE could be higher? How do you handle these type situations when collecting data for your surveys. Thanks


Top
 Profile Send private message  
Reply with quote  
 Post subject: Re: Labels For Equipment That Is Plugged In
PostPosted: Sat May 30, 2015 4:35 am 
Offline
Plasma Level
User avatar

Joined: Tue Oct 26, 2010 9:08 am
Posts: 1878
Location: North Carolina
EWB Engineering wrote:
When you guys are doing your studies how do you handle equipment that is plugged in? Say you have SO cord dropped from a 480v bus duct and the equipment is plugged in but has a disconnect on the side of it. Does this disconnect need a arc flash label? Does it matter if the equipment is on wheels and could be moved and plugged in at another location where the IE could be higher? How do you handle these type situations when collecting data for your surveys. Thanks


How about if you are a mine with about 60+ substations that get moved every 7-100 days? Yes, its a problem but consider the ultimate goal. You need to label equipment subject to frequent maintenance by NEC Code so if it rarely (less than once a year) gets any, it might be easier/faster to do it on the spot. Otherwise you need to adjust the input conditions to determine worst case or worst reasonable case and use that or make it standard practice to relabel when it moves or provide a table of values. Coal mines are required to change breaker settings based on cable length for a very similar setup. Recognizing that cable impedance lowers the available fault current, MSHA requires them to adjust trip settings accordingly.


Top
 Profile Send private message  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
© 2017 Arcflash Forum / Brainfiller, Inc. | P.O. Box 12024 | Scottsdale, AZ 85267 USA | 800-874-8883