NEC in the Facility

July 21, 2009
If you have ignitable fibers on site, you can choose the zone classification system (Art. 506) as an alternative to the division classification system (Arts. 500, 502, and 503).

If you have ignitable fibers on site, you can choose the zone classification system (Art. 506) as an alternative to the division classification system (Arts. 500, 502, and 503). Although this initially seems like a good choice, beware: There’s no free lunch.

In 506.4(A), a short sentence requires the area in question to be "properly documented." The NEC doesn't clearly define this. Generally, all electrical installations must be properly documented. The problem is the opinion of "proper" varies.

Before deciding on a zone or division classification system, discuss the documentation requirements with your insurer. You may need additional resources to create and maintain what's required.

Voice your opinion!

To join the conversation, and become an exclusive member of EC&M, create an account today!

Sponsored Recommendations

Electrical Conduit Comparison Chart

CHAMPION FIBERGLASS electrical conduit is a lightweight, durable option that provides lasting savings when compared to other materials. Compare electrical conduit types including...

Fiberglass Electrical Conduit Chemical Resistance Chart

This information is provided solely as a guide since it is impossible to anticipate all individual site conditions. For specific applications which are not covered in this guide...

Considerations for Direct Burial Conduit

Installation type plays a key role in the type of conduit selected for electrical systems in industrial construction projects. Above ground, below ground, direct buried, encased...

How to Calculate Labor Costs

Most important to accurately estimating labor costs is knowing the approximate hours required for project completion. Learn how to calculate electrical labor cost.