UL 844

What Is UL 844?

Description of UL 844:

UL has discharged a replacement edition of UL 844 , the quality for Luminaires to be used in unsafe (Classified) Locations. This revision to ANSI/UL 844 is being issued to feature a replacement paragraph, 37.5. On the UL web site, you’ll either purchase the complete thirteenth edition or simply the revised pages.UL 844 was revised to incorporate minimum glass thickness necessities for sophistication I, Division one luminaires. Specific details of new/revised necessities area unit found in table below.

In this comprehensive one-day workshop, you’ll find out about the newest necessities within the UL customary 844 for UL certification of luminaires and luminaire fittings for unsafe (classified) locations. The UL 844 customary covers the development and take a look at necessities for the subsequent luminaire sorts supposed for installation and use in unsafe (classified) locations, Class I, Divisions one and a couple of, Groups A, B, C and D; category II, Division 1, Groups E, F and G; category II, Division 2, teams F and G; and sophistication III, Divisions one and a couple of in accordance with the National Electrical Code, NFPA 70:

Fixed and permanently installed luminaires

Portable luminaires

Paint spray booth luminaires

Emergency luminaries

Each participant will receive a workbook, a copy of UL Hazardous Locations Services poster, and a copy of UL 844 Standard.

Requirements of Class I, Zones 1 explosion proof led lighting

1.1 These requirements cover fixed and portable luminaires for installation and use in hazardous (classified) locations, Class I, Divisions 1 and 2, Groups A, B, C, and D; Class II, Division 1, Groups E, F, and G; Class II, Division 2, Groups F and G; and Class III, Divisions 1 and 2, in accordance with the National Electrical Code, NFPA 70.

1.2 These requirements also cover luminaires for installation and use in Class I, Zones 1 and 2, Groups IIA, IIB, IIB plus Hydrogen, and IIC, and Zone 20, 21 and 22 hazardous (classified) locations in accordance with the National Electrical Code, NFPA 70.

1.3 These requirements cover luminaires for use only under the following atmospheric conditions:

a)    A minimum ambient temperature of minus 25°C (minus 13°F);

b)    An oxygen concentration not greater than 21 percent by volume; and

c)    A nominal barometric pressure of one atmosphere.

Description from the UL standards sales site

UL844, explosion proof lighting for Hazardous Locations–is used in conjunction with National Electrical Code Classes, Divisions, and Groups of atmospheres for the selection of fixtures for normally and not normally hazardous locations where volatile flammable liquids, flammable gases, and combustible materials may be present in the atmosphere. The SUMMARY OF HAZARDOUS ATMOSPHERES TABLE defines the NEC Classes, Divisions, and Groups by Atmospheres and Temperatures.

NEMA 4X Electric Lighting Fixtures for Installation Aboard Ship in Accordance with U.S. Coast Guard Electrical Regulations–indicates that luminaires provide protection from windblown dust and rain,splashing water, external icing, and hose-directed water.

For hazardous locations, the UL844 Listing is the key to luminaire selection and procedure as follows: If the SUMMARY OF HAZARDOUS ATMOSPHERES TABLE calls for the luminaire to be UL844 Listed, the selection process is critical. THE CLASSIFICATION OF A GIVEN AREA AS TO CLASS, DIVISION, AND GROUP IS SOLELY THE JUDGEMENT OF THE OWNER, RESPONSIBLE INSURANCE COMPANY, AND THE AUTHORITY HAVING JURISDICTION. And the process of specifying a luminaire type, lamp wattage, lamp type, etc., is an exacting job that requires THEM to take the following steps:

SELECTING UL844 200W Explosion Proof LED Lighting

STEP 1. Determine the normally hazardous or not normally hazardous atmosphere(s) present in the area to be lighted.

STEP 2. Use the information from STEP 1 and the SUMMARY OF HAZARDOUS ATMOSPHERES TABLE to determine:

–NEC Class, Division, and Group

–Location of temperature (exterior and interior)measurement on the luminaire.

–Limiting temperature value (if specified) in °C.

–General type of GE luminaire suitable for the application.

STEP 3. Determine the maximum ambient temperature in the area to be lighted.

STEP 4. For NEC Class I, Division 1, Groups C & D, All Class II Divisions and Groups and All Class III Divisions: Determine the Limiting Value Temperature from the SUMMARY OF HAZARDOUS ATMOSPHERES TABLE.

For NEC Class I, Division 2, Groups A, B, C, and D: Consult the TABLE OF COMMONLY ENCOUNTERED HAZARDOUS MATERIALS to determine the AUTOIGNITION TEMPERATURES for any materials that are normally or may be present in the atmosphere of the area to be illuminated.

If you need explosion proof led lighting with UL844, please contact us at info@razorlux.com.

Leave a Reply