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
230 or 345 kV transmission lines?
by Vlado
09/24/16 09:33 AM
breaker meltdown
by crselectric
09/24/16 12:42 AM
Electrical mast flashing product
by ThomasWinfrey
09/22/16 12:14 AM
What estimating software do you recommend?
by sparky
09/21/16 07:20 PM
"Dry Run" Inspection goes awry
by HotLine1
09/20/16 07:39 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
HotLine1 15
sparky 9
gfretwell 8
sparky66wv 8
Vlado 6
Who's Online
0 registered (), 153 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#166245 - 07/16/07 01:23 PM Divisions / Zones
okfixer Offline
Junior Member

Registered: 06/07/05
Posts: 6
Loc: Sidney,Ne, USA
What are the benefits of using zone locations over the division method? In looking over what OSHA is about to implement in August, it seems you have more liabilty using zone locations. Just curious.

Thanks

Top
Arc Flash PPE Clothing, LOTO & Insulated Tools
#166246 - 07/16/07 01:48 PM Re: Divisions / Zones [Re: okfixer]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5299
Loc: Blue Collar Country
They are simply two slightly different approaches. The biggest difference is that the 'zone' system has a category for stuff that is ALWAYS in a hazardous exposure ... such as inside a gas tank. Many things rated "Class 1 Division 1" are not intended to ALWAYS be in such an atmosphere.

The other aspect relates to enclosure ratings. Many items - controls in particular - are of European make, and are specified in terms of "zone," rather than area. As with other enclosure ratings, the European classifications are not quite exactly comparable to NEMA designations.

Hazardous location practices are something that you really have to evaluate for each job, considering the specifics of each situation, and keep in mind the 'big picture.' There are several approaches that can be taken ... not all of them electrical ... and it's not always smart to mix approaches.

I suppose it's not so much a matter of using either the 'zone' or 'area' method. I think you pretty much have to use both.

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