Hazloc Certification Acronyms

Certification by an impartial third-party or certification agency is an attestation that relevant safety and performance standards have been met. The certification process, no matter how complex, cannot be avoided and is a requirement for manufacturers wanting their electrical products to be approved for use. This is especially true for equipment (known as Ex-equipment), intended for use in hazardous areas (Hazloc)/ and explosive atmospheres.
There are many definitions and complex requirements involved in a certification process for a global Hazloc certification. To be successful in your certification process, you need to know many of the terms in use. To help you, Hazcon has prepared a list of many of the commonly used acronyms and their meaning.

We encourage everyone to suggest additional words and expressions that need to be added. We welcome your feedback. You can also reach us at info@hazcon.com.

AExSymbolizes that a product is built to U.S. ANSI Standards; the Ex means the product is built to IEC Standards, which are acceptable in the USA; Ex is the equivalent IEC reference in Canada.
AFCIArc-Fault Circuit Interrupter
AHJAuthority Having Jurisdiction
AITAuto-ignition temperature – the minimum temperature  at which an explosive mixture ignites due to heat alone.  Also called the ignition temperature.
ANSIAmerican National Standards Institute
APIAmerican Petroleum Institute
ASDAdjustable Speed Drives
ASMEAmerican Society of Mechanical Engineers
ASSEAn ANSI-accredited Standards developer and product certification body
ASTMAmerican Society for Testing Materials
ATEXA European Regulatory Framework for the manufacture and sale of explosion-protected equipment, for the E.U.
ATEX DirectiveATEX derives its name from the French title of the 2014/34/EU Directive: Appareils destinés à être utilisés en ATmosphères EXplosives.
AWGAmerican Wire Gage
BSIBritish Standards Institute
CE MarkMandatory European marking for certain product groups to indicate conformity with health and safety requirements of European Directives
CECCanadian Electric Code
CENELECEuropean Committee for Electrotechnical Standardization: a European Standards and certification body:
https://ec.europa.eu/growth/single-market/european-standards/harmonised-standards_en
CMLCertification Management Limited, an approval agency and a recognized “Notified body” in Europe
CL IStands for Class I. Refers to a North American classification of hazardous materials which are flammable and/or combustible liquids, gasses, or vapours.
CL IIStands for Class II. Refers to a North American classification of explosive materials which are combustible dusts.
CL IIIStands for Class III. Refers to a North American classification of explosive materials which are ignitable fibers or combustible flyings such as grain dust, cotton, rayon, etc.
C of CCertificate of Compliance
CSACanadian Standards Association, an International approval agency for North America. Also, a recognized NRTL for North America. CSA Certified Product Listing: https://www.csagroup.org/testing-certification/product-listing/
DIPDust Ignition-Proof
DaEquipment Protection Level for use in explosive dust atmospheres, provided a very high level of protection and therefore not a source of ignition in normal operation, expected or rare malfunctions
DbEquipment Protection Level for use in dust gas atmospheres, provided a high level of protection and therefore not a source of ignition in normal operation or expected malfunctions
DcEquipment Protection Level for use in explosive dust atmospheres, provided an enhanced level of protection and therefore not a source of ignition in normal operation
Div 1Stands for Division 1, a North America classification in which an explosive atmosphere exists under normal operating conditions, frequently due to repair/maintenance activities or leakage and mechanical failure or abnormal operation
Div 2Stands for Division 2, a North American classification in which an explosive atmosphere exists under equipment failure or abnormal operation (an area adjacent to a Division 1 location)
EMTElectrical Metallic Tubing
ENStands for Euronom, the name given to Standards developed by CENELEC
EPLEquipment Protection Level – the level of protection that is given to equipment based on the likelihood of its becoming a source of ignition. This marking also distinguishes the difference between explosive gas atmospheres, explosive dust atmospheres, and the explosive atmospheres in mines susceptible to firedamp.
EPREthylene Propylene Rubber
ExThis symbol denotes equipment for explosive atmospheres. This explosion protection symbol applies to zone systems.
Ex dThe “d” means a protection approach that involves a flameproof enclosure:  an enclosure that can withstand an internal explosion of a flammable mixture which has penetrated its interior without suffering damage and without causing ignition.
Ex eThis protection technique involves increased safety for electrical equipment to reduce the probability of excessive temperatures and the occurrence of arcs or sparks.
Ex iThe “I” in this protection approach refers to intrinsic safety. A type of protection in which, under normal or abnormal conditions, the electrical equipment is incapable of releasing sufficient electrical or thermal energy to cause ignition of the flammable or combustible mixture.
Ex mThis protection technique involves encapsulation (may also be called “potting”):  components which could potentially ignite an explosive atmosphere by releasing electrical or thermal energy are enclosed in a compound  (resin) to prevent ignition and prevent any spark from coming in contact with the hazardous substance.
Ex nThis type of protection involves the configuration of electrical equipment in such a way that it is incapable of igniting the surrounding atmosphere under normal operating conditions, and so that faults capable of causing ignition are not likely to occur.
Ex oThe “o” refers to a type of protection involving oil, often used in power equipment.  The electrical equipment is immersed in this protective liquid to prevent ignition of any explosive atmosphere above the liquid or outside the enclosure. The oil also controls the surface temperature to a safe level.
Ex pThe “p” in this prevention technique means a pressurized and or purged enclosure: a type of protection for electrical equipment that prevents the entrance of an explosive atmosphere into the enclosure by keeping it filled with a protective non-explosive gas at a higher pressure than that of the external atmosphere. Purging involves maintaining a flow of air or inert gas sufficient to dilute the concentration of the hazardous substance.
Ex qThis type of protection refers to a powder-filled (glass or quartz) enclosure.  Components that could potentially ignite an explosive atmosphere are fixed in place and surrounded by a filling such as glass or quartz powder so that ignition is prevented.
Ex tA type of protection in which the electrical equipment is equipped with an enclosure that keeps dust out of the source of ignition inside the equipment
ExCBIECEx Certification Body
ExMCIECEx Management Committee
ExTAGExTAG Decision Sheet Contains a list of decisions covering Ex Testing and Ex Certification under the IECEx System.
https://www.iecex.com/publications/extag-decision-sheets/
ExTLIECEx Ex Test Laboratory
ExTRIECEx Test Report
EXPFlameproof or Explosionproof
FMFactory Mutual, an International approval agency for North America. Also, a recognized NRTL for North America.
GaEquipment Protection Level for use in explosive gas atmospheres, provided a very high level of protection and therefore not a source of ignition in normal operation, expected or rare malfunctions; it is safe even if two malfunctions or faults occur independently from each other.
GbEquipment Protection Level for use in explosive gas atmospheres, provided a high level of protection and therefore not a source of ignition in normal operation or expected malfunctions.
GcEquipment Protection Level for use in explosive gas atmospheres, provided an enhanced level of protection and therefore not a source of ignition in normal operation.
GFCIGround-Fault Circuit Interrupter
HLAHazardous Location Area
HACHazardous Area Classification
HAZLOCHazardous Location; Hazloc equipment means hazardous location equipment.
IAPMOInternational Association of Plumbing and Mechanical Officials
IASInternational Accreditation Service
IIAGas group containing propane or other gases of equivalent hazard and characteristics
IIIADust group containing combustible flyings, including fibers, and others of equivalent hazard and characteristics
IIBGas group containing ethylene or other gases of equivalent hazard and characteristics
IIIBDust group containing combustible dust other than metal ducts and others of equivalent hazard and characteristics
IICGas group containing Acetylene and Hydrogen or other gases of equivalent hazard and characteristics
IIICDust group containing combustible metal dust and other solid particle combustible dust of equivalent hazard and characteristics
IECInternational Electrotechnical Commission  a not-for-profit organization founded in 1906, which prepares and publishes international Standards for electrical, electronic and related technologies
IECExInternational Electrotechnical Commission System for Certification to Standards relating to Equipment for use in Explosive Atmospheres.
https://www.iecex-certs.com
IECEEIEC Conformity Assessment for Electrotechnical Equipment and Components
IECQIEC Quality Assessment System for Electronic Components
IECREIEC Certification of Equipment for Use in Renewable Energy Applications
IECEx Certificate of Compliance  Certification by an IECEx Scheme Member, known as a certification body (CB). An attestation that relevant safety and performance standards have been met.
https://www.iecex-certs.com/
IMCIntermediate Metal Conduit
IPIngress Protection – the environmental protection of a device
IPInstitute of Petroleum
ISIntrinsically Safe
ITC-HInstrumentation Tray Cable for Hazardous Locations
LELLower Explosive Limit
MC-HLMetal-Clad Cable for Hazardous Locations
MESGMaximum experimental safe gap
MIMineral-Insulated
MICMinimum Igniting Current
MIEMinimum Ignition Energy
NECNational Electric Code, North America
NEMANational Electrical Manufacturers Association
NFPANational Fire Protection Association
NINon-incendive, a type of protection in which the equipment is incapable under normal conditions of causing ignition of a specified flammable gas or vapour-in-air mixture due to arcing or thermal effect
NIST/NVLAPNational Institute of Standards and Technology
NRTLNationally Recognized Testing Laboratory
NSFAn American product testing, inspection and certification organization
OEMOriginal Equipment Manufacturer
OSHAOccupational Safety and Health Administration
PLTCPower-Limited Tray Cable
QANQuality Assurance Notification- quality assurance for manufacturers of hazardous area equipment. It is a mandatory requirement for ATEX equipment manufacturers to have a Quality Assurance Notification for Category 1 and Category 2 products.
QARQuality Assessment Report – quality assurance for manufacturers of hazardous area equipment. It is a mandatory requirement for IECEx equipment manufacturers to have a Quality Assurance Report in order to get IECEx CofC.
https://www.iecex-certs.com/
QPSNorth America product testing, inspection and certification organization. A recognized NRTL for North America.
RMCRigid Metal Conduit
RMSRoot-Mean-Square
SCCStandards Council of Canada
SPDSurge-Protective Devices
TCTray Cable
T CodeTemperature Code (also called Temperature Class) – the maximum surface temperature that a given product will not exceed under a specified ambient temperature. For example, a T code of T2 means that its surface temperature will not exceed 300°C, provided it is operated in the ambient temperature indicated by the manufacturer. Used for international certification.
T1Temperature code of 450°C (842°F)
T2Temperature code of 300°C (572°F)
T2ATemperature code of 280°C (536°F)
T2BTemperature code of 260°C (500°F)
T2CTemperature code of 230°C (500°F)
T2DTemperature code of 215°C (419°F)
T3Temperature code of 200°C (392°F)
T3ATemperature code of 180°C (356°F)
T3BTemperature code of 165°C (329°F)
T3CTemperature code of 160°C (320°F)
T4Temperature code of 135°C (275°F)
T4ATemperature code of 120°C (248°F)
T5Temperature code of 100°C (212°F)
T6Temperature code of 85°C (185°F)
UELUpper Explosive Limit
ULUnderwriters Laboratories, an international product testing, inspection and certification organization. https://iq.ulprospector.com/info/
VFDVariable Frequency Drives
XLPECrosslinked Polyethylene
XPExplosion Proof; may also be used to represent flameproof

7 Comments

  1. Chris Dodds on May 13, 2020 at 12:54 pm

    Thanks, this is a useful resource which I’ve book-marked. Can we subscribe to your Blog? Appreciate your support and the expertise you provide to the explosive atmosphere industries.

    • hazcon on May 13, 2020 at 3:59 pm

      Thank you so much Chris for your kind words and also interested in our blog. We will be happy to have you as a subscriber to our website. We appreciate it your comments and feedback. Hazcon Inc.

  2. Cheng Yong on May 13, 2020 at 3:38 pm

    It’s very good! One comment, above ATI should be AIT。I aslo try to collect below Acronyms, hope useful.
    ABS: American Bureau of Shipping
    ANSI: American National Standards Institute
    ASTM: American Society for Testing Materials
    AFCI: Arc-Fault Circuit Interrupter
    AWG: American Wire Gage
    API: American Petroleum Institute
    ASD: Adjustable Speed Drives
    BSI: British Standards Institute
    EMT: Electrical Metallic Tubing
    EPR: Ethylene propylene rubber
    GFCI:Ground-Fault Circuit Interrupter
    IMC: Intermediate metal conduit
    ITC-HL, Instrumentation tray cable for hazardous locations
    IP: Institute of Petroleum
    MC-HL: Metal-clad cable for hazardous locations
    MC-HL: Metal-clad cable for hazardous locations
    MI, Mineral-insulated, Metal-sheathed
    MIC: Minimum igniting current
    MIE: Minimum Ignition Energy
    PLTC: Power-limited tray cable
    RMS: root-mean-square
    RMC: Rigid metal conduit
    SPD:Surge-Protective Devices
    TEFC:Totally enclosed fan cooled
    TC: Tray cable
    THD: Total harmonic distortion
    VFD: Variable Frequency Drives
    XLPE: Crosslinked polyethylene

    • hazcon on May 14, 2020 at 1:17 am

      Thanks Cheng for your comment and providing additional Acronyms. We updated the list per your inputs. Thank you again.

  3. Scott Kiddle on May 14, 2020 at 3:14 pm

    Very nice! Only comment is regarding IECEx since you noted ExCB and could note ExTL and ExTR along with ExTAG and ExMC. Another helpful item may be useful hyperlinks, such as: Europa for EU (Blue Guide, Directives and Official Journal), IECEx site for CoC and QAR, CSA and UL site for product listings

    • Hazcon on May 15, 2020 at 1:54 pm

      Thanks Scott for your comment and excellent idea. We added your suggested words with their hyperlinks. Thanks again.

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