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

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: 5316
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

Member Spotlight
Member Since: 12/24/00
Posts: 4259
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 90 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Stack, Scotto, Freecrowder, clee512, Jdscott2005

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