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Hazardous Locations and Intrinsically Safe Radios Hazardous Locations and Intrinsically Safe Radios

Hazardous Locations and
Intrinsically Safe (IS) Radios

FACT SHEET


Hazardous Location Regulations
In North America, a variety of codes, standards and regulatory bodies exist to address safety issues of hazardous locations. Regulations
on hazardous location by means of a Class/Division \system have been formulated by the National Electrical Code (NEC); Canadian Electrical Code (CEC) and the National Fire Protection Association (NFPA). Adherence to these regulations is required by equipment manufacturers and monitored by accredited test agencies. These standards enable manufacturers to design safe, explosion-protected electrical equipment that is tested with uniform and binding tests at test agencies such as SGS, Underwriters Laboratory (UL) and Factory Mutual (FM). On successful completion of the tests, these agencies issue conformity certificates which state that the required uniform safety standards for explosion protected electrical equipment have been met. The classification \system that is most widely used in North America is \defined by NEC, CEC and NFPA Publication 70. They define the type of hazardous substance that is, or may be, present in the air in quantities sufficient to produce explosions or ignitable mixtures.
Actually determining the classification of a specific location requires a thorough understanding of the particular site. This Fact Sheet does not serve as a source to determine how a location is actually classified; this is for general information purposes only to understand the equipment certifications of Vertex Standard intrinsically safe land mobile radios.

Hazardous Location Classifications
Class – The type of explosive or ignitable substances which are present in the atmosphere.
Group – Materials grouped based on their ignition temperatures and explosion pressures.
Division – Evaluation of location, independent of the Class.
Temperature – Designates the maximum operating temperatures on the surface of the equipment which should not exceed the ignition temperatures of the surrounding atmosphere.

Hazardous Location Classifications

Temperature Class
The temperature marking specified shall not exceed the ignition temperature of the specific gas or vapor to be encountered. Ignition temperature
is the minimum temperature required, at normal atmospheric pressure in the absence of a spark or flame, to set afire or cause self-sustained
combustion independently of the heating or heated element.

Temperature Class

Intrinsically Safe Defined
Intrinsic safety is a designed/engineered explosion protection method that is integral to the electrical circuit. Intrinsically safe equipment shall not be capable of releasing sufficient electrical or thermal energy under normal or abnormal conditions to cause ignition of a specific hazardous atmospheric mixture. Intrinsically safe certified electrical equipment must be distinctively marked in accordance to the classified area in which it can be installed. The minimum marking must indicate:


Vertex Standard Intrinsically Safe Certified Radios
All Vertex Standard intrinsically safe certified land mobile radios are tested in accordance with the ANSI/UL 913-1997 Fifth
Edition Standard for Safety for Intrinsically Safe Apparatus and Associated Apparatus for use in Class I, II, and III, Division 1 Hazardous Locations. Certifications have been obtained from the SGS-U.S. Testing Center for the following radios:SGS USTC





Intrinsically Safe Certification


Accessories Used with Intrinsically Safe Radios
Only manufacturer-designated, IS-approved accessories can be used with IS-certified radios. Batteries and accessories do not feature the IS certification markings. Additional IS-approved batteries and accessories may be used after the initial radio package is purchased. Replacement batteries and accessories can be sold indefinitely as long as model numbers do not change. Radios in the field will still be approved as long as the battery/accessory has not changed (model number and suffix remain the same).
Repairing Intrinsically Safe Radios Only Vertex Standard’s repair center is authorized to repair IS-certified Vertex Standard radios. If a radio is repaired anywhere else, the IS certification becomes void.

Repairing Intrinsically Safe Radios
Only Vertex Standard’s repair center is authorized to repair IS-certified Vertex Standard radios. If a radio is repaired anywhere else, the IS certification becomes void.

Specifications are subject to change without notice or obligation. The information contained in this publication is intended for general information purposes only. This is not a substitute for review of the applicable regulations and standards and should not be construed as legal advice or opinion. Readers with specific questions regarding the standards should refer to the cited regulation or consult with an attorney. Vertex Standard is a trademark of Vertex Standard LMR, Inc. All other trademarks are the property of their respective owners. © 2013 Vertex Standard LMR, Inc. All rights reserved. NAFS_10/2013

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