Class 1 Division 1 Electrical Installation

One of the following three situations must exist in order for an area to be considered a class ii division 1 location.

Class 1 division 1 electrical installation. Locations that would be considered to be class i include petroleum refineries gasoline storage areas dry cleaning plants spray finishing. Trust our team of licensed and certified electricians with years of installation experience and expertise to ensure your electrical systems are up to code and. Zone 2 group iia. Recommended reading for this topic.

A room with a propane gas installation will typically be classified with the. Zone 0 1 2. New cross references for class i. 1 areas must be listed for class i div.

Where combustible dust is present in the air under normal operating conditions in such a quantity as to produce explosive or ignitable mixtures. Class i division 2 group d. If a wiring method is allowed for div. The 2011 revision adds cross references for types mc cable 501 10 a 1 c and itc er itc was previously included cable 501 10 b 1 4.

Sources of such hazards include gases vapors dust fibers and flyings which are combustible or flammable. Since 2002 the nec has permitted hazardous locations to be categorized using either of two concepts or methods. Class i ii and iii division 1 and 2 nec article 500. There are two different divisions that exist in class i division 1 and division 2 along with three zones.

Class ii division 1. Article 501 contains the actual class i division 1 and division 2 installation requirements including wiring methods seals and specific equipment requirements. 1 it s also allowed for div. There are four general differences in wiring method requirements for div.

All work in class i division 1 and division 2 locations is completed and installed per nfpa 70 national electrical code nec as well as all other applicable codes and standards. Class i locations consist of areas where gases vapors or liquids may exist that have the potential to become flammable or ignitable. Where embedded electrical products are concerned the requirement for harsh environment industries such as oil and gas will usually be certification to class 1 division 2 and or atex zone 2. And class i zone 0.

Electrical equipment installed in such locations could provide an ignition source due to electrical arcing or high temperature. 1 fittings and flexible cords used in class i div. In electrical and safety engineering hazardous locations hazloc pronounced haz lōk are places where fire or explosion hazards may exist.