This glossary contains terms relevant to the professional building trades and are defined that way only. If a term can be defined in a context that is outside relevance to the construction industry, it will not be defined as such here.
Definitions of some of the terms are taken from the various trade code books and include the following among others:
- National Electrical Code®
- Uniform Mechanical Code®
- Uniform Plumbing Code®
- International Plumbing Code®
In such cases, those definitions are assigned a credit citation is given as to what code/chapter it is from. Keep in mind cited code definitions may become outdated. You should always check the most recent code version. The definitions listed here are for a matter of your convenience and knowledge gain. Terms may include definitions from multiple trade codes where you can compare the similarities or differences to get a worldly view so you don’t have to take crap from the plumber.
Glossary term definitions may also come from other sources including the researched opinion and experience of the site administrator who has decades of experience in the building and construction trades as a licensed professional.
Some terms may have both a code definition and a common practical definition/explanation given as accepted and common knowledge among experienced tradesmen. In such cases the code definition is always given first.
Bear with me as I diligently and endlessly add terms, definitions, and media.
- ABS
- Absorption Refrigeration System
- Absorption Unit
- AC Cable
- Accepted Engineering Practice
- Access
- Access Cover
- Accessible
- Adapter Fitting
- Adjustable Circuit Breaker
- Adjustable Speed Drive
- Adjustable Speed Drive System
- AFCI
- AHJ
- Air Admittance Valve
- Air Break
- Air Conditioned
- Air Gap
- Air Handling Unit
- Air Moving System
- Alternate Water Source
- Alternative Engineered Design
- Ampacity
- Antisiphon
- Appliance
- Appliance Branch Circuit
- Appliance Categorized Vent Area
- Appliance Fuel Connector
- Approved
- Approved Agency
- Approved Testing Agency
- Arc-Fault Circuit Interrupter
- Area Drain
- Armored Cable
- Askarel
- Aspirator
- Assembly Building
- Associated Apparatus
- Associated Nonincendive Field Wiring Apparatus
- Attachment Plug
- Authority Having Jurisdiction
- Automatic
- Azeotrope
- Backflow
- Backflow Connection
- Backflow Preventer
- Backwater Valve
- Bare Conductor
- Base Flood Elevation
- Bathroom
- Bathroom Group
- Battery System
- Beam
- Bedpan Steamer or Boiler
- Bedpan Washer and Sterilizer
- Boiler Room
- Bonded
- Bonding
- Bonding Conductor
- Bonding Jumper
- Branch Circuit
- Branch Circuit Overcurrent Protective Device
- Branch Interval
- Branch Pipe
- Branch Vent
- Breathing Zone
- Breathing Zone Outdoor Airflow
- Breeching
- Brick
- BTU/H
- Builder
- Building
- Building Code
- Building Drain
- Building Gravity Drain
- Building Sewer
- Building Subdrain
- Building Trap
- Buttering
- BX Cable
- Bypass Isolation Switch
- Cabinet
- Cable Routing Assembly
- CAS Number
- Central Heating Plant
- Certified
- Charge Controller
- Chimney
- Circuit Breaker
- Circuit Breaker Setting
- Circuit Vent
- Cistern
- Cleanout
- Closed Combustion Solid Fuel Burning Appliance
- Clothes Closet
- Clothes Dryer
- Coaxial Cable
- Code
- Code Official
- Combination Fixture
- Combination Waste and Vent System
- Combined Building Drain
- Combined Building Sewer
- Combustable Dust
- Combustable Gas Detection System
- Combustion Air
- Common Vent
- Communications Equipment
- Communications Raceway
- Companion Valves or Block Valves
- Composite Optical Fiber Cable
- Concealed
- Concealed Fouling Surface
- Condenser
- Condensing Appliance
- Conditioned Space
- Conductive Optical Fiber Cable
- Conductor
- Conduit Body
- Confined Space
- Construction
- Construction Acronyms & Abbreviations
- Construction Documents
- Contamination
- Continuous Duty
- Continuous Load
- Control Circuit
- Control Drawing
- Controlled Vented Power Fuse
- Controller
- Cooking Unit, Counter-Mounted
- Cooling
- Cooling System
- Cooling Unit
- Copper-Clad Aluminum Conductors
- Cord Connector
- Covered Conductor
- Crawl Space
- Critical Level
- Cross Connection
- Current Limiting Overcurrent Protective Device
- Cutout
- Cutout Box
- Damper
- Damp Location
- Dead End
- Dead Front
- Demand Factor
- Depth of Trap Seal
- Design Flood Elevation
- Design Pressure
- Developed Length
- Device
- Direct Gas-Fired Makeup Air Heater
- Direct Vent Appliance
- Discharge Pipe
- Disconnecting Means
- Disconnecting Switch
- District Heating Plant
- Draft Hood
- Drain
- Drainage Fittings
- Drainage Fixture Unit
- Drainage System
- Drainage System Air Break
- Dry Location
- Duct
- Duct Furnace
- Duct System
- Dustight
- Dust-Ignitionproof
- Duty
- Dwelling
- Dwelling Unit
- Effective Ground-Fault Current Path
- Effective Opening
- EGC
- Electrical Circuit Protective System
- Electrical Ducts
- Electric Code
- Electric-Discharge Lighting
- Electric Heating Appliance
- Electrician
- Electric Power Production and Distribution Network
- Electric Sign
- Electronically Actuated Fuse
- Emergency Floor Drain
- Enclosed
- Energized
- Equipment
- Equipment Bonding Jumper
- Equipment Grounding Conductor
- Essentially Nontoxic Transfer Fluids
- Essentially Toxic Transfer Fluids
- Evaporative Cooler
- Evaporative Cooling System
- Evaporator
- Excess Flow Valve
- Exhaust Air
- Existing Installations
- Explosionproof Equipment
- Exposed
- Expulsion Fuse
- Externally Operable
- Faucet
- FCC Cable
- FEB
- Feeder
- Festoon Lighting
- Field Evaluation Body
- Field Labeled
- Field Test Pressure
- Fill Valve
- Fire Code
- Fire Damper
- Fireplace Stove
- Fire Resistive Construction
- Fitting
- Fixture Branch
- Fixture Drain
- Fixture Supply
- Fixture Supply Fitting
- Fixture Waste Fitting
- Flood Hazard Area
- Flood Hazard Area Subject To High Velocity Wave Action
- Floor Furnace
- Forced Air Type Central Furnace
- Fractionalization
- Fuse
- Fusible Plug
- Galvanized Steel
- Garage
- Gas Vent Connector
- GEC
- General Contractor
- General-Purpose Branch Circuit
- General Use Snap Switch
- General Use Switch
- Generator - Refrigeration
- GFCI
- Gravity Heating System
- Gravity Type Warm Air Furnace
- Ground
- Grounded
- Grounded Conductor
- Ground Fault
- Ground-Fault Circuit Interrupter
- Ground-Fault Current Path
- Ground-Fault Protection of Equipment
- Grounding
- Grounding Electrode
- Grounding Electrode Conductor
- Guarded
- Guest Room
- Guest Suite
- Handhole Enclosure
- Hazardous Location
- Heat (Energy) Recovery Ventilator
- Heating Degree Day
- Heating Equipment
- Heat Pump
- Hermetically Sealed
- Hermetic Refrigerant Motor-Compressor
- High Pressure Boiler
- High Side
- Hoistway
- Hood
- HVAC
- HVACR
- Hybrid System
- Hysterisis
- Identified
- IDLH
- Immediately Dangerous to Life and Health
- Individual Branch Circuit
- Industrial Control Panel
- Industrial Heating Equipment
- Information Technology Equipment
- Innerduct
- Insanitary Location
- In Sight From
- Instantaneous Trip Circuit Breaker
- Insulated Conductor
- Integrated Gas Spacer Cable
- Interactive Inverter
- Interactive System
- Intermittent Duty
- Internal Gross Volume
- Interrupter Switch
- Interrupting Rating
- Intersystem Bonding Termination
- Intrinsically Safe Apparatus
- Intrinsically Safe System
- Inverse Time Circuit Breaker
- Isolated
- Isolating Switch
- ITE
- Joint
- Joist
- Kitchen
- Labeled
- Lighting Outlet
- Lighting Track
- Line Contact Installation
- Liquid Receiver
- Liquified Petroleum Gas
- Listed
- Listing Agency
- Live Parts
- Lower Explosive Limit
- Low Pressure Hot Water Heating Boiler
- Low Pressure Steam Heating Boiler
- Low Side
- Luminaire
- Machinery
- Main Bonding Jumper
- Makeup Air
- Manufacturer
- Manufacturer's Installation Instructions
- MCC
- MC Cable
- Mechanical Refrigeration System
- Medium Voltage Cable
- Metal Clad Cable
- Millwright
- Mineral Insulated Metal Sheathed Cable
- Mobile Equipment
- Montreal Protocol
- Mortar
- Motor Circuit Switch
- Motor Control Center
- Multifamily Dwelling
- Multioutlet Assembly
- Multiple Fuse
- Multiwire Branch Circuit
- National Electrical Code
- NEC
- Neutral Conductor
- Neutral Point
- Nominal Voltage
- Nonautomatic
- Noncombustible
- Nonconductive Optical Fiber Cable
- Nonincendive Circuit
- Nonincendive Component
- Nonincendive Equipment
- Nonincendive Field Wiring
- Nonincendive Field Wiring Apparatus
- Nonlinear Load
- Nonmetallic Sheathed Cable
- Nonvented Power Fuse
- Occupancy
- Occupancy Classification
- Oil Cutout
- Oil Immersion
- Oil Switch
- One-Family Dwelling
- Optical Fiber Cable
- Outlet
- Outline Lighting
- Outside Air
- Overcurrent
- Overhead Service Conductors
- Overload
- Panelboard
- Periodic Duty
- Permissible Exposure Limit
- Personal Protective Equipment
- Photovoltaic System
- Piping
- Plenum
- Plug
- Plug Cap
- Plumber
- Plumbing Code
- Portable Cooling Unit
- Portable Equipment
- Portable Evaporative Cooler
- Portable Heating Appliance
- Portable Ventilating Equipment
- Positive Displacement Compressor
- Power Boiler Plant
- Power Fuse
- Power Outlet
- PPE
- Premises Wiring
- Pressure Connector
- Pressure Imposing Element
- Pressure Limiting Device
- Pressure Relief Device
- Pressure Relief Valve
- Pressure Test
- Pressurized
- Process Seal
- Purged and Pressurized
- Qualified
- Qualified Person
- Raceway
- Radiant Heater
- Rafter
- Rainproof
- Raintight
- Readily Accessible
- Receptacle
- Receptacle Outlet
- Refrigerant Compressor
- Refrigerant Pressure Vessel
- Refrigerant Safety Classifications
- Refrigeration Machinery Room
- Refrigeration Room or Space
- Regulator Bypass Switch
- Remote Control Circuit
- Render
- Residential Building
- Retrofit Kit
- Return Air
- Riser Heat Pipe
- Romex
- Room Heater
- Room Large in Comparison With Size of Equipment
- Rupture Member
- Sanitary Drain
- Sealable Equipment
- Selective Coordination
- Self Contained
- Self Contained Refrigeration System
- Separately Derived System
- Service
- Service Cable
- Service Conductors
- Service Drop
- Service Entrance Conductors
- Service Equipment
- Service Lateral
- Service Point
- Shaft
- Shaft Enclosure
- Shall
- Short Circuit Current Rating
- Short-Time Duty
- Should
- Show Window
- Signaling Circuit
- Simple Apparatus
- Slang (Construction)
- Smoke Damper
- Smoke Detector
- Solidly Grounded
- Special Permission
- Stand Alone System
- Standard
- Stationary Fuel Cell Power Plant
- Stop Valve
- Storm Drain
- Structure
- Stucco
- Stud
- Substation
- Superheat - Refrigeration
- Supervised Industrial Installation
- Supplementary Overcurrent Protective Device
- Supply Air
- Supply Side Bonding Jumper
- Surge Arrester
- Surge Protective Device
- Switch
- Switchboard
- Switchgear
- Switching Device
- System Bonding Jumper
- System Outdoor Airflow
- Tap Conductor
- Thermally Protected
- Thermal Protector
- Thermal Resistivity
- Three Way Stop Valve
- Track Lighting
- Trained
- Transfer Switch
- Two-Family Dwelling
- Ultimate Strength
- Unclassified Locations
- Underground Service Conductors
- Ungrounded
- Uninterruptible Power Supply
- Unit Heater
- Unusually Tight Construction
- Unvented Room Heater
- Utilization Equipment
- Varying Duty
- Vent
- Vented Appliance Categories
- Vented Decorative Appliance
- Vented Power Fuse
- Vented Wall Furnace
- Ventilated
- Ventilating Ceiling