Building Code Glossary
Service Equipment: Building Code Definition
How the IRC 2009 define service equipment, where the wording differs, and which chapters depend on the term.
On this page
Last updated September 7, 2026 · Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control.
Direct answer
Service equipment is a defined term in the International Residential Code (IRC) 2009, in Electrical Definitions. The code's own words are: “The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s), and their accessories, connected to the load end of the service conductors to a building or other structure, or an otherwise designated area, and intended to constitute the main control and cutoff of the supply.” No other I-Code in this corpus defines it, so the IRC 2009 definition is the one to work from. The term is used in 15 chapters of this corpus, most often in Services (IRC 2009), Building Planning (IRC 2009), Swimming Pools (IRC 2009). These pages transcribe the 2009 model text; verify the definition against the edition and amendments your authority having jurisdiction has adopted.
Content and cited inputs reviewed by Scott Barrington, Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.
What does this term mean?
Service Equipment — IRC 2009, Electrical Definitions:
The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s), and their accessories, connected to the load end of the service conductors to a building or other structure, or an otherwise designated area, and intended to constitute the main control and cutoff of the supply.
What must be verified before using this guidance?
Service Equipment is defined once in this corpus, in the Electrical Definitions chapter of the International Residential Code (IRC) 2009:
The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s), and their accessories, connected to the load end of the service conductors to a building or other structure, or an otherwise designated area, and intended to constitute the main control and cutoff of the supply.
Where service equipment is used in the code
The term appears in 15 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.
| Chapter | Code | Mentions |
|---|---|---|
| Services | IRC 2009 | 22 |
| Building Planning | IRC 2009 | 8 |
| Swimming Pools | IRC 2009 | 8 |
| Electrical Definitions | IRC 2009 | 5 |
| Aviation Facilities | IFC 2009 | 4 |
| Building Services and Systems | IFC 2009 | 3 |
| Scope and Administration | IBC 2009 | 2 |
| Structural Design | IBC 2009 | 2 |
| Liquefied Petroleum Gases | IFC 2009 | 2 |
| Scope and Administration | IMC 2009 | 2 |
| Scope and Administration | IPC 2009 | 2 |
| General Requirements | IRC 2009 | 2 |
3 further chapters mention the term.
The term in use
How the code actually writes about service equipment, quoted from the 2009 text hosted here:
Individual meter socket enclosures shall not be considered service equipment.
The actual weights of materials and construction shall be used for determining dead load with consideration for the dead load of fixed service equipment.
An 8 AWG or larger solid copper bonding conductor provided to reduce voltage gradients in the pool, spa, or hot tub area shall not be required to be extended or attached to remote panelboards, service equipment, or electrodes.
The terms service equipment is built out of
The definition above leans on 5 other defined terms. Each carries its own code definition, and a local amendment to any of them changes what service equipment covers:
- Service Conductors — IRC 2009: The conductors from the service point to the service disconnecting means.
- Circuit Breaker — IRC 2009: A device designed to open and close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating.
- Equipment — IRC 2009: All piping, ducts, vents, control devices and other components of systems other than appliances that are permanently installed and integrated to provide control of environmental conditions for buildings.
- Structure — IPC 2009: That which is built or constructed or a portion thereof.
- Building — IBC 2009: Any structure used or intended for supporting or sheltering any use or occupancy.
Service Equipment: what to open, and in what order
Every row is a document this term depends on. The ICC code library and the ICC adoption maps cover the middle rows.
| Check | Where | Confirmed |
|---|---|---|
| Read the definition in the adopted IRC | Electrical Definitions | |
| Re-check the requirement that uses it | Services (IRC 2009) | |
| Re-check the requirement that uses it | Building Planning (IRC 2009) | |
| Re-check the requirement that uses it | Swimming Pools (IRC 2009) | |
| Re-check the requirement that uses it | Electrical Definitions (IRC 2009) | |
| Confirm the dependent definition | Service Conductors | |
| Confirm the dependent definition | Circuit Breaker | |
| Confirm the dependent definition | Equipment | |
| Local amendment to any of the above | Jurisdiction's amendment list |
A research aid, not a code determination. The authority having jurisdiction decides which edition and which amendments apply.
Where can you explore related guidance?
- Explore all glossary guidance
- Service Conductors: Building Code Definition
- Circuit Breaker: Building Code Definition
- Structure: Building Code Definition
- Equipment: Building Code Definition
Sources and method
Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The ICC code library publishes the current model text and the ICC adoption maps show which edition a jurisdiction has adopted; those sources control.
Source links
Frequently asked questions
What is the code definition of service equipment?
The International Residential Code (IRC) 2009 defines it in Electrical Definitions as: “The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s), and their accessories, connected to the load end of the service conductors to a building or other structure, or an otherwise designated area, and intended to constitute the main control and cutoff of the supply.” The 2009 model text is reproduced here; the definition that binds your project is the one in the edition your jurisdiction has adopted, as amended locally.
Which parts of the code depend on service equipment?
In this corpus the term is used across 15 chapters, led by Services in the IRC 2009. Those are the sections whose scope moves if the definition is amended locally, so read them together with Chapter 2 rather than on their own.
What is considered service equipment?
In the 2009 I-Codes hosted here it is a defined term rather than a description. The IRC 2009 states, in Electrical Definitions: “The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s), and their accessories, connected to the load end of the service conductors to a building or other structure, or an otherwise designated area, and intended to constitute the main control and cutoff of the supply.” It is defined in IRC 2009. Because it is a defined term, whatever the adopted edition says it means is what every section using it means — so check Chapter 2 of that edition and any local amendment before relying on this wording.
What is considered service entrance equipment?
Service Entrance is a separate defined term. The IBC 2009 defines it as: “An entrance intended primarily for delivery of goods or services.” That is not the same as service equipment, which the IRC 2009 defines as “The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s), and their accessories, connected to the load end of the service conductors to a building or other structure, or an otherwise designated area, and intended to constitute …” — read both before applying either, and confirm the wording in the edition your jurisdiction has adopted.
What is the difference between a service and a feeder?
Feeder is a separate defined term. The IRC 2009 defines it as: “All circuit conductors between the service equipment, or the source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device.” That is not the same as service equipment, which the IRC 2009 defines as “The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s), and their accessories, connected to the load end of the service conductors to a building or other structure, or an otherwise designated area, and intended to constitute …” — read both before applying either, and confirm the wording in the edition your jurisdiction has adopted.
Related pages
- Service Conductors: Building Code Definition
Service Conductors — IRC 2009 definition: The conductors from the service point to the service disconnecting means.
- Service Corridor: Building Code Definition
Service Corridor — IBC 2009 definition: A fully enclosed passage used for transporting HPM and purposes other than required means of egress.
- Service Entrance: Building Code Definition
Service Entrance — IBC 2009 definition: An entrance intended primarily for delivery of goods or services.
- Service Lateral: Building Code Definition
Service Lateral — IRC 2009 definition: The underground service conductors between the street main, including any risers at a pole or other …
- Service Water Heating: Building Code Definition
Service Water Heating — IECC 2009 definition: Supply of hot water for purposes other than comfort heating.
- Service: Building Code Definition
Service — IRC 2009 definition: The conductors and equipment for delivering energy from the serving utility to the wiring system of …