Hazardous locations certification

Certified testing and approval for control-valve devices used in hazardous locations is normally procured by the manufacturer of the device. The manufacturer often goes to a third party laboratory for testing and certification. Applicable approval standards are available from CSA, CENELEC, EM, SAA, and UL. 

Certification of motors used in hazardous locations 11/266 Further reading 11 /272... 

While some video display screens such as liquid crystal, gas plasma or vacuum fluorescent displays do not present the same charged screen hazards as CRTs, this does not imply that they are safe for use in hazardous locations. This requires special design and certification for use with a given flammable atmosphere. Non-certified equipment used in locations classified as hazardous under Article 500 of NFPA 70 National Electrical Code require a purged or pressurized enclosure to control ignition hazards as described in NFPA 496 Standard for Purged and Pressurized Enclosures for Electrical Equipment. The screen in this case is located behind a window in the enclosure. 

In spite of the rigorous design requirements and the need for certification, instrinsically safe electrical circuits offer many advantages which the other hazardous location electrical techniques do not. 

Where is it possible or desirable to locate the near-infrared analyzer modnle What hazardous area certification requirements apply to both analyzer and sampling system ... 

Explosion-proof vacuum cleaners are specifically designed for use in areas where the presence of flammable gases, vapors or finely pulverized dust in the atmosphere are sufficient to create a threat of explosion or fire. The design of the vacuum must be legally certified and evaluated for hazardous locations by a Nationally Recognized Testing Lab (NRTL) approved by OSHA. Although many vacuum companies claim to offer explosion proof vacuums, it is imperative that you ask for proof of NRTL certification. 

Safety Person or designated person), in conjunction with supervisors, will conduct a walk-through survey of each work area to identify sources of work hazards. Each survey will be documented using the Hazard Assessment Certification Form, which identifies the work area surveyed, the person conducting the survey, findings of potential hazards, and date of the survey. (Safety Person or designated person) will keep the forms in the (Specify exact location, e.g., your company s business files). 

As a rule, they are installed in the safe area as associated apparatus. They are used to limit the electrical values for sensors, actuators etc. located in the hazardous area to levels permissible for intrinsic safety. A certificate is required each time. 

According to 1910.146(c)(7)(iii), our company documents the basis for determining that all hazards in a permit space have been ehminated, through a certification that contains the date, location of the space, and signature of the person making the determination. At our company,... 

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