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I NTRODUCT I ON CERTIFICATION MARKINGS

Certification Marking of Equipment for use in Explosive Atmospheres

North American Certification Marks In the US, equipment certification is issued by a “Nationally Recognized Testing Laboratory” (NRTL) approved by the Occupational Health and Safety Administration (OSHA). In Canada, equipment certification is issued by a “laboratory and certification body” (CB) accredited by the Standards Council of Canada (SCC). Both the NEC and CE Code require products include a “certification mark” issued by an accredited NRTL or CB. Final acceptance of specific certification marks is at the discretion of the AHJs (some jurisdictions may not accept all certification marks). Most NRTLs and CBs use the terms “approved” and “certified” when referring to equipment that meets the requirements of the applicable Standards. Only Underwriter Laboratories Inc. (UL) identifies three different levels of certification as follows. Listed means the same as certified or approved. This means a product has been fully investigated to a specific set of construction standards. In hazardous locations, Zone type products must be specifically “Listed” for the location. Classified products are different than listed products. Products carrying this mark have been evaluated for specific properties. Although UL has a Canadian mark, CSA has no equivalent certification process. Most NRTLs and CBs test and approve component products that are incomplete or restricted in performance capabilities. Components are intended to be used with other certified equipment (for example, an actuator may be approved as a component but cannot be used unless it is installed in an appropriate (approved) enclosure). Components are not intended for separate installation in the field, most AHJs require assemblies containing multiple components to be submitted to a CB for additional approvals. (This is similar to the “U” certificates in the IECEx and ATEX systems) Several NRTLs and CBs are listed with both OSHA and SCC to approve products for both Canada and the US. This can simplify the approval process for original equipment manufacturers (OEMs) and panel builders as it allows them to provide a single product that complies with the NEC and CE Code.

USA OSHA NATIONALLY RECOGNIZED TESTING LABORATORIES (NRTL)

CANADA SCC ACCREDITED CERTIFICATION BODY

CSA

CSA

FM

FM

Intertek

Intertek

LabTest

LabTest

MET QPS

MET QPS

UL

UL

DEKRA*

ESAFE*

SGS* NOTE: OSHA and SCC define the specific Standards to which these agencies can test and certify products to. There can be differences the Scope of Accreditation of some organizations. * Not accredited in both countries The certification mark of each agency may include the letters “US” or “C” to identify suitability for each country. Logos that include ”US” on the right side and “C” on the left identify the product is approved for use in both countries. The CB logos can be confusing since the certification logos themselves remain the same, only the “US” and “C” inclusions change. Most NRLTs issue component listing of products which means that selected products may be offered in modular form, which the customer may assemble without affecting the listing. Certification Marks for the USA only

Certification Marks for Canada only

Certification Marks for both Canada and US

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