Which type of cable is allowed in hazardous locations?

Which type of cable is allowed in hazardous locations?

Type MC-HL
Type MC-HL is permitted in Class I , Division 1 hazardous (classified) locations. This is a multi-conductor, gas and vaportight continuous corrugated metal-sheathed cable provided with an overall polymeric jacket and an additional equipment grounding conductor sized in accordance with NEC 250.122.

What is a Class 1 Division 1 location?

Class I, Division 1 classified locations. An area where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or some of the time under normal operating conditions. A Class I, Division 1 area encompasses the combination of Zone 0 and Zone 1 areas.

What type of cable is classification 1?

Instead, its function is to announce the presence of any hazardous occurrence. Class 1 wiring is actually required to exceed standards for power and lighting wiring. It must sit in metal or non-metallic raceway or be metal-sheathed wiring as compared to jacketed cable such as type NM.

What is a Class 1 hazardous location?

flammable gases
Class I Locations A “Class I Location” is created by the presence of flammable gases or vapors in the air in sufficient quantities to be explosive or ignitable. When these materials are found in the atmosphere, a potential for explosion exists if an electrical or other source of ignition is present.

What are the classifications of hazardous locations General wiring equipment?

Let’s quickly review. The National Electric Code classifies hazardous locations in three ways: TYPE, CONDITION, and NATURE. There are three types of hazardous conditions: Class I – gas and vapor, Class II dust, and Class III – fibers and flyings.

What is the difference between Class 1 Division 1 and Class 1 Division 2?

Class 1 Hazardous Locations refer to facilities which deal with flammable gases, vapors, and liquids. Division 2 specifies that these flammable materials are handled, processed, or used in the defined hazardous location, but are not normally present in concentrations high enough to be ignitable.

Does Class 1 Div 1 require explosion proof?

For Clarification Purposes, Nema Enclosures Manufacturing does NOT provide Nema 7 or Explosion Proof Enclosure. In an environment where hazardous gases or dusts are always present a Class 1, Division 1 rated is required in North America and EX d for the rest of the world.

What are Class 1 wiring methods?

A class 1 circuit is the portion of the wiring system between the load side of the overcurrent protection device (OCPD) or the power-limited supply and the connected load. For example, Class 1 power-limited circuits are supplied by a power supply with an output that does not exceed 30 volts and 1,000 volt-amps.

What is Class 2 and Class 3 wiring?

Class 2 and 3 circuits are defined as the portion of the wiring system between the power source and the connected equipment. Class 3 circuits limit the output power to a level that usually will not initiate fires. But, they can and do operate at higher voltage levels and, therefore, can present a shock hazard.

What is a Class II Division 1 location?

Class Definition Class I locations are those in which flammable vapors and gases may be present. • Class II locations are those in which combustible dust may be found. • Class III locations are those which are hazardous because of the presence of easily ignitable fibers or flyings.

What is a Class 1 Division 2 location OSHA?

Note to the definition of “Class I, Division 2:” This classification usually includes locations where volatile flammable liquids or flammable gases or vapors are used, but which would become hazardous only in case of an accident or of some unusual operating condition.

What are the electrical wiring requirements for Class I hazardous areas?

Wiring requirements within Class I hazardous areas using Division system are found in Part II of Article 501. The recognized acceptable wiring methods are included in 501.10, with (A) addressing Division 1 locations, and (B) addressing Division 2 locations. Wiring requirements for the Class I, Zone system are found in 505.15.

What type of wiring is allowed in Class I Division 2?

501.10 (B) Class I, Division 2. (1) General. In Class I, Division 2 locations, all wiring methods permitted in 501.10 (A) and the following wiring methods shall be permitted: (1) Rigid metal conduit (RMC) and intermediate metal conduit (IMC) with listed threadless fittings.

What is a Class 1 Division 1 electrical system?

Since Class I, Division 1 locations are expected to include ignitible concentrations of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors under normal operating conditions, the wiring requirements are more restrictive (see photo 1).

What are the NEC classifications of hazardous materials?

“Class I, Division 1” is the most hazardous classification, but “Class I, Division 2” is the type most often of concern to cable users. The various classifications are summarized in the table below. Class I and II materials are further subdivided by the NEC into “Groups” (A, B, C, etc.) as shown.