The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Correct rotation, wrong sequence
by Potseal
Today at 03:14 PM
Industrail Control Panel bonding per 409.108
by sparkyinak
Yesterday at 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
New in the Gallery:
12.5A through 0.75mm flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 12
HotLine1 10
Potseal 9
sparkyinak 8
Texas_Ranger 7
Who's Online
1 registered (cableguy619), 212 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#149951 - 06/07/04 08:06 AM Explosive Atmospheres
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Is there an equivalent Standard in the US for the application of an Explosive Atmosphere.
Installations that spring to mind are:
Gas Stations, Spray Paint Booths, LPG Filling Stations.
Here NZS 2380.1 covers most things, but they are called Hazardous Areas here.
We have EX ratings on all HA gear.
How is gear rated in the US?.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

Top
Arc Flash PPE Clothing, LOTO & Insulated Tools
#149952 - 06/08/04 09:17 PM Re: Explosive Atmospheres
DougW Offline
Member

Registered: 06/08/03
Posts: 1083
Loc: North Chicago, IL
Basically, the NEC divides Hazardous Atmospheres into the following (courtesy of the gelightingsystems.com website, since I don't have my Code book handy):

 Quote:
CLASS I locations are those in which flammable Gases or Vapors are ormay be present in the air in quantities sufficient to produce explosive orignitable mixtures.

CLASS II locations are those that are hazardous because of the presence of Combustible Dust.

CLASS III locations are those that are hazardous because of the presence of easily ignitable Fibers or Filings, but in which such fibers or filings are not likely to be in suspension in the air in quantities sufficient to produce ignitable mixtures

Each “CLASS” is further defined as either Division 1 or Division 2.

DIVISION 1 is an environment that is "Normally Hazardous".

DIVISION 2 is an environment that is "Not Normally Hazardous".

Top
#149953 - 06/14/04 02:45 PM Re: Explosive Atmospheres
nesparky Offline
Member

Registered: 06/21/01
Posts: 650
Loc: omaha,ne
Mike
if you have a NEC book look in chapter 5 Hazardous locations. read carefully, it can be confusing and is something of a specalized area. I have seen and heard a lot of sometimes heated discussion about what is needed and where especally when some one is trying to save money. The equipment for hazardous areas can be very very expensive.
_________________________
ed

Top
#149954 - 06/18/04 03:32 AM Re: Explosive Atmospheres
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Ed, Doug,
Thanks for your responses.
Hazardous Area work is something that I try to keep right away from.
I have repaired the odd pump in the Fuel pumps here and that was as close as I wanted to get to that kind of thing.
I am the Maintenance Electrician, at a local Flour Mill and we have been changing over the last few years, all of the motors to Non-Sparking types (ExN), some of them were Slip-ring types for speed control, but Micro-drives put that fire out!.
Last guy didn't have a clue!.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

Top
#149955 - 06/18/04 09:28 PM Re: Explosive Atmospheres
nesparky Offline
Member

Registered: 06/21/01
Posts: 650
Loc: omaha,ne
Mike
If you look in the NEC that area would fall into the class 2 chapters. I have done enough grain,and dusty area to get my fill of these areas. You need a lot of care to keep the dust out of the equipment. Good explosion proof equipment is expensive but where needed will save lives and property.
Unfourtunatly I have seen the result of grain and suger dust explosions, no different for TNT for results. Some of those were fatals to employees.
Take care and be safe.
_________________________
ed

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals