Explosionproof Equipment Class II Quiz

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Questions and Answers

Explosionproof equipment and wiring shall be required in Class II locations.

False

What is required for flexible connections to elevators in Class II, Division 1 locations?

listed dusttight fittings

What type of boxes and fittings are required in Class II, Division 1 locations?

dusttight

Type TC-ER cable installed in a Class II, Division 2 location must include a bonding jumper.

False Signup and view all the answers

Nonincendive field wiring is permitted using any of the wiring methods for what type of locations?

unclassified Signup and view all the answers

What is the required space between adjacent cables installed in ladder trays?

not less than the larger cable diameter Signup and view all the answers

What is the minimum length for a vertical raceway extending from a dust-ignitionproof enclosure?

5' Signup and view all the answers

Surge-protective capacitors must be of a type designed for what?

specific duty Signup and view all the answers

What is required on fire doors communicating with Class II, Division 1 locations to minimize dust entrance?

suitable seals Signup and view all the answers

Transformers that do not contain a liquid that will burn shall be installed in vaults.

True Signup and view all the answers

Transformers and capacitors are permitted in a Class II, Division 1, Group E location if enclosed in a vault.

False Signup and view all the answers

What type of enclosures are required for devices in Class II, Division 1 locations?

none of the above Signup and view all the answers

What types of motors are allowed in Class II, Division 1 locations?

B Signup and view all the answers

What is the minimum thickness required for ventilating pipes in Class II, Division 1 locations?

0.021" Signup and view all the answers

What type of flexible cord is permitted in Class II, Division 1 locations?

listed for hard use Signup and view all the answers

Each luminaire in Class II, Division 1 locations must indicate what for the lamp?

maximum wattage Signup and view all the answers

Ventilating pipes in Class II, Division 1 locations must be what throughout their length?

dusttight Signup and view all the answers

What is the minimum airspace required for transformers rated in excess of 25 kVA?

6" Signup and view all the answers

Study Notes

Explosionproof Equipment in Class II Locations

Explosionproof equipment is not required or acceptable in Class II locations unless specifically identified.

Wiring Methods for Class II, Division 1

Permitted wiring methods in Class II, Division 1 locations include:
- Threaded rigid metal conduit
- Threaded steel intermediate metal conduit
- Type MI cable

Elevator Cable Requirements

Elevator cable types EO, ETP, or ETT are allowed in Class II, Division 1 locations only when terminated with listed dusttight fittings.

Boxes and Fittings Specifications

Boxes and fittings in Class II, Division 1 must have threaded bosses for conduit or cable and be dusttight.

Type TC-ER Cable Requirement

Type TC-ER cable in Class II, Division 2 does not require a bonding jumper in addition to any existing drain wire.

Nonincendive Wiring

Nonincendive field wiring is permitted using wiring methods suitable for unclassified locations.

Cable Installation in Trays

Type P cable must be installed in a single layer in cable trays with a minimum space equal to the larger cable diameter unless protected against dust buildup.

Raceway Sealing Standards

A vertical raceway, at least 5 feet long, extending downward from a dust-ignitionproof enclosure is an approved sealing method in Class II locations.

Surge-Protective Capacitors

Surge-protective capacitors must be designed for their specific duty.

Transformer and Capacitor Vault Requirements

Transformers and capacitors with burning liquids in a vault need self-closing fire doors that have suitable seals to limit dust entrance.

Non-Flammable Transformers and Capacitors

Transformers and capacitors without burning liquids must be either installed in compliant vaults or identified as a complete assembly including terminal connections.

Installation Restrictions for Transformers in Class II Locations

Transformers and capacitors must not be installed in Class II, Division 1, Group E locations unless enclosed in a vault.

Device Enclosure Specifications

Enclosures for switches, circuit breakers, motor controllers, etc., in Class II, Division 1 must not be of any specific type for that location.

Electrical Machinery Requirements

Motors, generators, and other electrical machinery must be labeled as Class B or C for Class II, Division 1 locations.

Ventilating Pipes Standards

Ventilating pipes for motors or electrical equipment must be made of metal at least 0.021 inches thick or otherwise be noncombustible.

Wiring for Pendant Luminaires

In Class II, Division 1 locations, wiring between outlet boxes and pendant luminaires not enclosed in conduit must be flexible cord listed for hard use.

Luminaire Identification

Each luminaire must be identified for Class II, Division 1 locations and clearly marked for the type and maximum wattage of the lamp.

Dusttight Ventilating Pipes

Ventilating pipes and their connections in Class II, Division 1 locations must be dusttight along their entire length.

Transformers with Askarel Requirements

Transformers over 25 kVA containing askarel in Class II, Division 2 must have a minimum of 6 inches of airspace from combustible materials.

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Description

Test your knowledge on the requirements and specifications for explosionproof equipment in Class II locations. This quiz covers wiring methods, elevator cable requirements, and box specifications. Prepare yourself for practical safety and compliance in hazardous environments.