Class 1 Division 1 Electrical Installation

Class i ii and iii division 1 and 2 nec article 500.

Class 1 division 1 electrical installation.

Since 2002 the nec has permitted hazardous locations to be categorized using either of two concepts or methods. In electrical and safety engineering hazardous locations hazloc pronounced haz lōk are places where fire or explosion hazards may exist. And class i zone 0. 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.

There are four general differences in wiring method requirements for div. 1 areas must be listed for class i div. 1 it s also allowed for div. Where combustible dust is present in the air under normal operating conditions in such a quantity as to produce explosive or ignitable mixtures.

There are two different divisions that exist in class i division 1 and division 2 along with three zones. Recommended reading for this topic. Class i division 2 group d. National electrical code nfpa 70 chapter 5 article 500.

Zone 2 group iia. Electrical equipment installed in such locations could provide an ignition source due to electrical arcing or high temperature. 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. 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.

Article 501 contains the actual class i division 1 and division 2 installation requirements including wiring methods seals and specific equipment requirements. Locations that would be considered to be class i include petroleum refineries gasoline storage areas dry cleaning plants spray finishing. Zone 0 1 2. Assured systems offer a comprehensive range of class 1 division 2 and or atex zone 2 qualified products including panel pcs embedded computers data.

Protection techniques for hazardous areas north america. 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. If a wiring method is allowed for div. Sources of such hazards include gases vapors dust fibers and flyings which are combustible or flammable.

1 fittings and flexible cords used in class i div. One of the following three situations must exist in order for an area to be considered a class ii division 1 location. Class ii division 1.