Which of the following wiring methods is permitted to be used in Class II Division 1 locations?
Threaded rigid metal conduit
In Class II, Division 1 locations, the following wiring methods shall be permitted: Threaded rigid metal conduit (Type RMC) or threaded steel intermediate metal conduit (Type IMC). Type MI cable with termination fittings listed for the location.
Where the Class 1 Division 1 location boundary is below grade A sealing fitting shall be permitted to be installed?
The sealing fitting shall be permitted to be installed on either side of the boundary within 3.05 m (10 ft) of the boundary, and it shall be designed and installed to minimize the amount of gas or vapor within the portion of the conduit installed in the Division 1 location that can be communicated beyond the seal.
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.
Where type MI cable is used in Class I Division 1 locations it shall be installed and supported in a manner to avoid at the termination fittings?
tensile stress
Type MI cable shall be installed and supported in a manner to avoid tensile stress at the termination fittings.
Is liquid tight conduit explosion proof?
Liquidtight Flexible Steel Conduit, Type UA, 1 Inch, UL Listed, Zinc-Coated Steel Core, Color: Gray.
When sealing fittings are required for Class 1 locations they shall comply with which of the following rules?
In the 2017 NEC, the rule for sealing cables in a Class I Division 1 location now requires the seal-off fitting to be within 18 inches of the enclosure where the cable terminates or as required by markings on the enclosure.
Where do you put conduit seals?
According to NEC 501.15a[3], seal offs must be applied in each nipple or conduit connection to an explosion proof enclosure. A drain seal is required where moisture could potentially accumulate, so that a proper exit path can be established, while maintaining its sealed features.
What is the definition of Class 1 Div 2?
Class I, Division 2. A Class I, Division 2 location is a location: (1) In which volatile flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are handled, processed, or used, but in which the liquids, vapors, or gases will normally be confined within closed containers or closed systems from which they can escape…
What is Class 1 Div 2?
A Class 1, Div 2 hazardous location is an area in which flammable gases, vapors or liquids may potentially be present. If poorly designed electrical devices, wiring or circuits are deployed in a Class 1, Div 2 environment they can introduce electrical discharges that will serve as the ignition points…
What is a Class 2 Divison 2?
A Class II, division 2 malocclusion was associated with a severe overjet and 100% deep bite due to moderately supraerupted upper incisors and excessively supraerupted lower incisors. The upper incisors were upright, and the lower incisors normally inclined. Both arches exhibited mild-to-moderate crowding.
