Get the Guide to Class/Division rated hazardous classified areas

Learn more about Class/Division rated hazardous classified areas from our expert product safety testing, certification, and regulatory compliance team here at CertifiGroup.

This whitepaper will cover:

Important product safety testing, certification, and regulatory expertise from our team here at CertifiGroup

Fill out the form below to gain access to the white paper immediately.

Thank you for your submission, the requested weekly whitepaper is now available below.

Weekly Whitepaper
Week #80

General Purpose Equipment in Classified Areas

Class/Division rated hazardous classified areas

Classified Area Requirements: In general, electrical equipment used in a Division 1 location, and switches or other make-break contact devices used in a Class I location, are required to be marked for use in the installed location. However, electrical equipment used in a Division 2 area is not always required to comply with this marking requirement, allowing for use of general-purpose equipment.

General Use Equipment – US NEC: Part III of Articles 501, 502, and 503 of the U.S. National Electric Code (NEC) include specific allowances for general-purpose equipment that is permitted to be located in Classified Areas. These allowances are primarily for windings (without contacts or brushes) and resistors (i.e. heaters) for Class I locations. Class II locations permit the use of some switching devices when installed in dust-tight enclosures.

Division 2 Considerations: Because Division 2 areas typically only present a flammable atmosphere in the event of an accident or unusual operating condition, consideration for explosion protection is usually only required with electrical equipment operating normally. If the equipment does not contain any normally arcing or sparking parts, considerations for spark ignition may not even be needed.

Thermal Considerations: One big caveat is that although the NEC permits the use of general-purpose equipment in some cases, it does not exempt this equipment from complying with section 500.8 of the NEC. This section requires all equipment to be suitable for the thermal ignition properties of the flammable material (gas, vapor, etc.). So, regardless of the type of equipment, consideration for thermal ignition is always required. This means that the temperature of any surface exposed to the flammable material must be known to be less than the auto-ignition temperature of the flammable material.

In normal operation, this may not be difficult for some equipment. However, special consideration is required for heaters in Class I locations. Surface temperatures of heaters are not permitted to exceed 80% of the auto-ignition temperature.

Unsure about your HazLoc Design?

Have CertifiGroup Conduct a Preliminary Review to Identify the

Best Protection Method for Your Product

CertifiGroup Can Guide your HazLoc Product Compliance &

Certify Your HazLoc Product for UL, CSA, ATEX, IECEx

Experts in UL, CSA, CE, & International Regulatory Compliance

©2014-2020 CertifiGroup – complete copies of this document may be freely distributed

Contact Inquiry Form

Fill out the form below and we’ll get back to you in 2-3 business days.

How would you like to get in touch?

Please select a preferred method of contact.

Direct Phone Line

Call and talk with a human, available 8:30 AM-4:30 PM Monday-Friday.

Contact Inquiry Form

Write us about your next project.

Available 24/7 365 days per year.