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Open Wiring on Insulators
Exposed wiring using cleats and knobs.
Concealed Knob-and-Tube
Wiring method using knobs and tubes, concealed.
Type AC Cable
Flexible metal enclosure for insulated conductors.
Metal-Clad Cable (Type MC)
Insulated conductors in a metallic sheath.
Armored Cable (Type AC)
Fabricated assembly of insulated conductors, flexible.
Direct Burial
Cable installation underground, identified for use.
Cable Tray
Support system for multiple cables in one area.
Aerial Cable
Cable suspended on a messenger wire.
Services, Feeders, Branch Circuits
Electrical distribution components in wiring systems.
Power Circuits
Circuits designed to supply electrical power.
Lighting Circuits
Circuits specifically for lighting fixtures.
Control Circuits
Circuits for controlling electrical devices.
Signal Circuits
Circuits for transmitting signals or communications.
Exposed Wiring
Wiring not concealed within building structures.
Concealed Wiring
Wiring hidden within walls or ceilings.
Corrosive Vapors
Harmful gases that can damage wiring materials.
Damp Locations
Areas with moisture but not wet conditions.
Wet Locations
Areas subject to direct water exposure.
Hazardous Locations
Areas with potential fire or explosion risks.
Flexible Tubing
Protective covering for insulated conductors.
Insulated Conductors
Wires coated to prevent electrical contact.
Nominal Voltage
Standard voltage level, typically 600 volts.
Masonry Walls
Walls made of brick or stone materials.
Moisture-Impervious Jacket
Protective layer preventing moisture ingress.
Metallic Sheathing
Metal covering providing physical protection to cables.
Knobs and Tubes
Traditional wiring method using ceramic knobs.
Fish Cable
Running cable through walls or ceilings.
Type NM Cable
Not for multifamily dwellings over three floors.
Type NMC Cable
Prohibited in hazardous classified locations.
Type NMS Cable
Not allowed in places of assembly.
Type MC Cable
Avoid in corrosive conditions like direct burial.
Type MI Cable
Mineral-insulated, metal-sheathed cable for various uses.
Type SNM Cable
Shielded nonmetallic-sheathed cable for moisture resistance.
Service Entrance Cable
Single or multi-conductor for service applications.
Type SE Cable
Flame-retardant, moisture-resistant service entrance cable.
Type USE Cable
Permitted for service laterals above ground.
Type TC Cable
Used for power, lighting, and control circuits.
Type UF Cable
Underground feeder and branch circuit cables.
Type FC Cable
Flat cable assemblies for direct burial.
Corrosive Conditions
Includes exposure to strong chlorides and caustic alkalis.
Mineral Insulation
Highly-compressed refractory mineral for conductor insulation.
Liquidtight Sheath
Gastight covering for Type MI cable.
Moisture Resistance
Protection against water and humidity exposure.
Flame Resistance
Material that resists ignition and burning.
Exposed Locations
Areas where cables are not concealed or protected.
Concealed Locations
Cables installed within walls or ceilings.
Direct Burial
Cables installed underground without additional protection.
Branch Circuits
Circuits that extend from a distribution panel.
Power Circuits
Circuits designed to deliver electrical power.
Signal Circuits
Circuits used for communication signals.
Cable Trays
Support structures for multiple cable runs.
Raceways
Enclosed channels for electrical wiring.
Physical Damage
Damage from external forces affecting cable integrity.
Type UF Cables
Permitted for underground and interior wiring.
Type FCC Cables
Flat copper conductors for branch circuits.
Type TC Cables
Factory assembly of insulated conductors.
Nonmetallic Extensions
Insulated conductors in nonmetallic jackets.
Integrated Gas Spacer Cable
Aerial cable with supporting messenger integrated.
Medium Voltage Cable
Rated 2001 volts or higher for power systems.
Flat Conductor Cable
Three or more flat conductors placed edge-to-edge.
Overcurrent Protection
Protection against exceeding rated ampacity.
Cable Trays
Supports multiple conductors in a single assembly.
Messenger-Supported Wiring
Wiring supported by a messenger wire.
Direct Burial
Installation of cables directly in the ground.
Service Entrance Cables
Cables used for electrical service entry.
Hazardous Locations
Areas requiring special wiring considerations.
Corrosive Vapors
Gases that can damage electrical components.
Raceway
Enclosed channel for wires and cables.
Branch Circuit
Circuit that supplies power to outlets.
General Purpose Circuit
Circuit for general electrical use.
Appliance Branch Circuit
Circuit dedicated to specific appliances.
Aerial Cable
Cable installed above ground, often supported.
Loose-Fit Nonmetallic Conduit
Flexible conduit for insulated conductors.
Directly Buried Cables
Cables installed without additional protective covering.
Voltage Rating
Maximum voltage a cable can safely carry.
Corrosive Locations
Areas where materials can corrode wiring.
Surface Extensions
Wiring extensions mounted directly on surfaces.
Twisted Conductors
Conductors twisted together for stability.
Factory-assembled Wiring
Wiring pre-assembled in a factory setting.
Multi-Conductor Type
Cable with multiple conductors in one assembly.
Cable Assemblies
Combination of multiple cables into one unit.
Intermediate Metal Conduit (IMC)
Metal raceway with circular cross-section for conductors.
Rigid Metal Conduit (RMC)
Specially constructed raceway for electrical conductor installation.
Flexible Metallic Tubing (FMT)
Non-rigid conduit for drawing conductors post-installation.
Electrical Metallic Tubing (EMT)
Thinner-walled metal conduit for concealed or exposed work.
Rigid Nonmetallic Conduit
Nonmetallic conduit resistant to moisture and chemicals.
Surface Metal Raceway (SMR)
Metal assembly for surface mounting of electrical conductors.
Liquidtight Flexible Metal Conduit
Flexible metal raceway with liquidtight outer jacket.
Surface Nonmetallic Raceway
Nonmetallic raceway for surface mounting, moisture-resistant.
Busway
Assembled metal trough for bare conductors as feeders.
Underfloor Raceway
Raceway type suitable for installation under flooring.
Cable Tray
Structural system used to support electrical cables.
Cable Bus
Assembly of insulated conductors in ventilated metal housing.
Cellular Floor Raceway
Enclosed metal housing with hollow spaces for conductors.
Multi-outlet Assembly
Surface flush raceway for conductors and receptacles.
Messenger Wire
Support wire for insulated conductors in installations.
Corrosion Protection
Measures to protect conduits from corrosive environments.
Dissimilar Metals
Avoid contact to prevent galvanic corrosion in systems.
Enamel Protection
Corrosion protection using enamel for ferrous raceways.
Hazardous Locations
Areas requiring special conduit types for safety.