Where do you put conduit seals?
Generally, conduit seals are required within 18 inches of the point of entry to explosion-proof enclosures to contain explosions and flames within the enclosure and prevent them from being rapidly transmitted through the conduit systems.
What is a Division 2 hazardous area?
Class I, Division 2 or Zone 2 classified locations. An area where ignitable concentrations of flammable gases, vapors or liquids are not likely to exist under normal operating conditions. In this area the gas, vapor or liquids would only be present under abnormal conditions (most often leaks under abnormal conditions).
How do you make something explosion proof?
To meet the criteria for the explosion proof rating, an enclosure must be able to contain any explosion originating within its housing and prevent sparks from within its housing from igniting vapors, gases, dust, or fibers in the air surrounding it.
Can I use a piece of equipment approved for use in a Division 2 hazardous location in a Division 1 hazardous location?
Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? A: Yes. If equipment has been approved for use in a Division 1 hazardous location, it can be used in a Division 2 hazardous location, providing it is in the same class and group.
What NEC chapter covers hazardous locations?
NEC Article 502: Class II Hazardous Locations.
What makes a light explosion proof?
To be certified, explosion-proof lights typically will be made of durable, non-sparking material, a very thick glass globe over the bulb, and other features to ensure that the worker and the surrounding environment remains safe should an ignition occur inside the light.
What is the most hazardous classification on a job site?
Class I and Class II Divisions are further subdivided into Groups A, B, C, and D. Group A is considered the most hazardous, with Group D being the least hazardous for gases and vapors. The explosive characteristics of the air mixtures of gases, vapors, or dusts vary with the specific material involved.
Is liquid tight conduit explosion-proof?
Liquidtight Flexible Steel Conduit, Type UA, 1 Inch, UL Listed, Zinc-Coated Steel Core, Color: Gray.
What wiring methods are allowed in Class II locations?
Wiring methods In Class II locations, any wiring method allowed for Div. 1 is allowed for Div. 2 [502.10 (B) (1) (1)]. For Div. 2, you can use these wiring methods in addition to any used for Div. 1: • Rigid metal conduit (RMC) or intermediate metal conduit (IMC) whether threaded or not (for Div. 1, these conduits must be threaded).
What is a Class II electrical control?
In Class II, Div. 1 locations, provide electrical controls (e.g., switches, breakers), control transformers, and resistors with enclosures identified for use in the location [502.115, 502.120]. If Div. 2, provide this equipment with enclosures that are dusttight or identified for the location [502.115, 502.120].
What type of fittings can be used with explosion proof conduit?
Only explosion proof or flameproof unions, couplings, reducers and elbows that are not larger than the trade size of the conduit shall be permitted between the sealing fitting and an explosion-proof or flameproof enclosure.
What size conduit is required to be sealed?
Where seals are required for these large conduits they must be within 450 mm (17.7 in.) of the enclosure. 2 inch or lar er conduit Ml cable 1.5 inch conduit Subrule (3)(d) requires a seal where this conduit enters a non- explosion proof box.