Questions and Answers
The purpose of a ceiling fitting is to:
The type of anchor shown in the figure above is:
NEC article 344 provides the requirements for:
One characteristic of aluminum conduit is that it:
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A type of conduit that has a wall thickness less than that of RMC but thicker than EMT is:
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The voltage drop of conductors carrying alternating current in PVC will be less than that of identical conductors:
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A type of fitting used to prevent damage to PVC caused by temperature changes is a(n):
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To act as a moisture seal, an outer covering of liquidtight, sunlight-resistant flexible material is placed around ____.
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A type of conduit body with a 90 degree connector and the cover on the left is a:
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EMT is:
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EMT must be supported every ____.
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The maximum allowable spacing between horizontal wire way supports is ____.
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NEC Article 386 contains:
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Another name for a stand off support is a:
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Derating factors shall only be applied when the number of current carrying conductors in a wire way exceeds:
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When an equipment frame is bonded to metal conduit, it acts as the equipment:
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When making a conduit to box connection and a bonding wire will be installed, use a:
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When installing conduit in reinforced concrete, it is best to use a:
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Wire bundles are commonly secured using:
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A typical metric fastener size is:
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When installing hammer-driven pins and studs in soft concrete block, the drive pin or stud should be embedded in the concrete for at least:
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The highest power level for a powder-actuated device is:
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A type of anchor that is a good choice when jacking or leveling the fastening component is a:
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When using an empty anchoring system:
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Cable trays are covered in ____.
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Cable trays mounted in a tunnel are most likely to use:
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When transporting long lengths of raceway the job site:
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Conduit is best stored:
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Conduit that passes from a classified location into an unclassified location requires the use of:
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A type of fastener with a bulge shaped head is a:
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Study Notes
Ceiling Fitting Purpose
- Intended to minimize the passage of gases, vapors, and flames through conduits.
Anchor Types
- Toggle bolt is used when the figure indicates a specific type of anchor.
NEC Article 344
- Governs the requirements forRigid Metal Conduit (RMC).
Aluminum Conduit Characteristics
- More resistant to wet environments compared to other materials.
Conduit Wall Thickness
- Intermediate Metal Conduit (IMC) has a wall thickness that is between RMC and EMT.
Voltage Drop in PVC
- Conductors in PVC demonstrate a lower voltage drop than those in steel conduit.
Temperature Protection for PVC
- An expansion coupling is utilized to prevent PVC damage caused by temperature fluctuations.
Moisture Seal for Conduit
- A flexible metallic conduit requires a liquidtight, sunlight-resistant outer covering to act as a moisture seal.
Conduit Body Types
- A type LL or type LR conduit body has a 90-degree connector with the cover on the left.
EMT Characteristics
- EMT is often called thin-wall conduit and cannot be threaded.
EMT Support Requirements
- EMT must be supported at intervals not exceeding 10 feet (3 meters).
Horizontal Wire Way Supports
- Maximum allowable spacing is 10 feet (3 meters) between supports.
NEC Article 386
- Contains installation specifications for surface metal raceways.
Stand Off Support
- Another term for a stand off support is Minerallac.
Derating Factors for Conductors
- Derating factors apply when the number of current-carrying conductors in a wire way exceeds 30.
Equipment Frame Bonding
- Bonding an equipment frame to metal conduit functions as the equipment's grounding conductor.
Conduit to Box Connection
- A grounding locknut is preferred when a bonding wire is to be installed during a conduit to box connection.
Installing Conduit in Concrete
- Best practice is to use a concrete box with ears for installations in reinforced concrete.
Securing Wire Bundles
- Wire bundles are typically secured using tie raps.
Typical Metric Fastener Size
- An example of a metric fastener size is M8*1.
Hammer-Driven Pins and Studs
- In soft concrete block, pins or studs should be embedded at least 1-1/4 inches (32 mm).
Power Actuated Device Levels
- The highest power level for a powder-actuated device is level 12.
Anchor Types for Fastening Components
- A stud bolt anchor is ideal for jacking or leveling fastening components.
Empty Anchoring System Best Practices
- Use an anchor screen in hollow walls or brick for best results.
Cable Tray Regulations
- Covered under NEC Article 355.
Cable Tray Mounting in Tunnels
- Wall mounting is commonly used for cable trays in a tunnel setting.
Transporting Long Lengths of Raceway
- Ends of the raceway should be flagged during transport for safety.
Best Storage for Conduit
- Conduit is best stored in pipe racks to prevent damage.
Transition Between Classified Locations
- A sealing fitting is necessary when conduit transitions from a classified to an unclassified location.
Fastener Types
- A drywall screw is identified by a bulged head shape.
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Description
Test your knowledge on electrical conduit installation with this quiz. It covers various conduit types, materials, and relevant NEC regulations. Evaluate your understanding of fitting purposes, wall thicknesses, and moisture seals to ensure safe and effective installations.
