It is currently Thu Nov 23, 2017 4:55 pm



Post new topic Reply to topic
Author Message
ekstra   ara
 Post subject: MCC SAFETY and TABLES
PostPosted: Wed May 25, 2011 12:43 am 
Offline

Joined: Sat May 01, 2010 2:20 am
Posts: 36
I notice rubber mats in front of the mcc's in some companies.
1. should they be labeled with some type of diectric rating ?
2 what other basic equipment should these rooms contain ?

Is there a way to use the default tables in 70e when you always have to use the notes and to use the notes you must do some engineering first to see if you are within the parameters of available fault current ?


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Wed May 25, 2011 4:51 am 
Offline
Sparks Level

Joined: Mon Mar 29, 2010 5:02 am
Posts: 136
Maybe contain:
- Arcflash face shield?
- Safety sticks??
- PPE matrix?
- Single Line drawings showing how the systems are fed


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Wed May 25, 2011 5:12 am 
Offline
Plasma Level

Joined: Mon Jun 02, 2008 11:58 am
Posts: 1103
Location: Charlotte, NC
Yes, you need to know the available fault current and clearing times to know if the tables can be applied. The Ei's in an MCC can vary widely and can sometimes be well above 40cal/cm2. The biggest factor is if you have a main breaker or not, and what trip functions it has.

As for the mats, there are rubber mats with class ratings, same as gloves, that need to be tested annually, but those are not what is normally used in the type of application you are explaining, usually those are just "diamond deck" style mats. I have never been a fan of them because they can give workers a false sense of security, they only offer protection if no other part of the body is grounded (Touching the MCC enclosure for example). Using rubber mats changes nothing as far as safe work practice requirements are concerned.


Top
 Profile Send private message  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 2 guests


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