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---
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aliases:
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- nec-110
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title: Article 110 Requirements for Electrical Installations
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tags:
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- authorship/other
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- destiny/uncertain
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@@ -8,13 +9,13 @@ tags:
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- status/draft
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- topic/construction/electrical
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- type/media/reference
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title: Article 110 Requirements for Electrical Installations
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up: "[[nfpa-70_national-electric-code]]"
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---
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# Article 110 Requirements for Electrical Installations
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## Part I. General ^p1
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## Part I. General
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### 110.1 Scope. ^1
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### 110.1 Scope.
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This article covers general requirements
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for the examination and approval, installation and use,
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@@ -25,7 +26,7 @@ and tunnel installations.
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> [!info] Informational Note:
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> See Informative Annex J for information regarding ADA accessibility design.
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### 110.2 Approval. ^2
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### 110.2 Approval.
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The conductors and equipment required or permitted by this Code shall be acceptable only if approved.
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@@ -34,9 +35,9 @@ The conductors and equipment required or permitted by this Code shall be accepta
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> and 110.3, Examination, Identification, Installation, and Use of Equipment.
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> See definitions of Approved, Identified, Labeled, and Listed.
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### 110.3 Examination, Identification, Installation, Use, and Listing (Product Certification) of Equipment. ^3
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### 110.3 Examination, Identification, Installation, Use, and Listing (Product Certification) of Equipment.
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#### 110.3(A) Examination. ^3a
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#### 110.3(A) Examination.
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In judging equipment, considerations such as the following shall be evaluated:
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@@ -62,36 +63,36 @@ In judging equipment, considerations such as the following shall be evaluated:
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* (8) Other factors that contribute to the practical safeguarding of persons using or likely to come in contact with the equipment
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#### 110.3(B) Installation and Use. ^3b
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#### 110.3(B) Installation and Use.
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Equipment that is listed, labeled, or both shall be installed and used in accordance with any instructions included in the listing or labeling.
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#### 110.3(C) Listing. ^3c
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#### 110.3(C) Listing.
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Product testing, evaluation, and listing (product certification) shall be performed by recognized qualified electrical testing laboratories and shall be in accordance with applicable product standards recognized as achieving equivalent and effective safety for equipment installed to comply with this Code.
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> [!info] Informational Note:
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> The Occupational Safety and Health Administration (OSHA) recognizes qualified electrical testing laboratories that perform evaluations, testing, and certification of certain products to ensure that they meet the requirements of both the construction and general industry OSHA electrical standards. If the listing (product certification) is done under a qualified electrical testing laboratory program, this listing mark signifies that the tested and certified product complies with the requirements of one or more appropriate product safety test standards.
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### 110.4 Voltages. ^4
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### 110.4 Voltages.
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Throughout this Code, the voltage considered shall be that at which the circuit operates. The voltage rating of electrical equipment shall not be less than the nominal voltage of a circuit to which it is connected.
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### 110.5 Conductors. ^5
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### 110.5 Conductors.
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Conductors used to carry current shall be of copper, aluminum, or copper-clad aluminum unless otherwise provided in this Code.
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Where the conductor material is not specified, the sizes given in this Code shall apply to copper conductors. Where other materials are used, the size shall be changed accordingly.
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### 110.6 Conductor Sizes. ^6
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### 110.6 Conductor Sizes.
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Conductor sizes are expressed in American Wire Gage (AWG) or in circular mils.
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### 110.7 Wiring Integrity. ^7
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### 110.7 Wiring Integrity.
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Completed wiring installations shall be free from short circuits, ground faults, or any connections to ground other than as required or permitted elsewhere in this Code.
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### 110.8 Wiring Methods ^8
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### 110.8 Wiring Methods
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Only wiring methods recognized as suitable
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are included in this Code.
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@@ -100,13 +101,13 @@ shall be permitted to be installed
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in any type of building or occupancy,
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except as otherwise provided in this Code.
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### 110.9 Interrupting Rating. ^9
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### 110.9 Interrupting Rating.
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Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage at least equal to the current that is available at the line terminals of the equipment.
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Equipment intended to interrupt current at other than fault levels shall have an interrupting rating at nominal circuit voltage at least equal to the current that must be interrupted.
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### 110.10 Circuit Impedance, Short-Circuit Current Ratings, and Other Characteristics. ^10
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### 110.10 Circuit Impedance, Short-Circuit Current Ratings, and Other Characteristics.
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The overcurrent protective devices, the total impedance, the equipment short-circuit current ratings, and other characteristics of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices used to clear a fault to do so without extensive damage to the electrical equipment of the circuit. This fault shall be assumed to be either between two or more of the circuit conductors or between any circuit conductor and the equipment grounding conductor(s) permitted in 250.118. Listed equipment applied in accordance with their listing shall be considered to meet the requirements of this section.
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@@ -380,7 +381,7 @@ Each disconnecting means shall be legibly marked to indicate its purpose unless
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Equipment enclosures for circuit breakers or fuses applied in compliance with series combination ratings selected under engineering supervision in accordance with 240.86(A) shall be legibly marked in the field as directed by the engineer to indicate the equipment has been applied with a series combination rating. The marking shall meet the requirements in 110.21(B) and shall be readily visible and state the following:
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```
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```none
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CAUTION --- ENGINEERED SERIES COMBINATION SYSTEM RATED _______ AMPERES.
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IDENTIFIED REPLACEMENT COMPONENTS REQUIRED.
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```
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@@ -389,7 +390,7 @@ IDENTIFIED REPLACEMENT COMPONENTS REQUIRED.
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Equipment enclosures for circuit breakers or fuses applied in compliance with the series combination ratings marked on the equipment by the manufacturer in accordance with 240.86(B) shall be legibly marked in the field to indicate the equipment has been applied with a series combination rating. The marking shall meet the requirements in 110.21(B) and shall be readily visible and state the following:
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```
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```none
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CAUTION --- SERIES COMBINATION SYSTEM RATED ____ AMPERES.
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IDENTIFIED REPLACEMENT COMPONENTS REQUIRED.
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```
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@@ -946,7 +947,7 @@ Table 110.34(E) Elevation of Unguarded Live Parts Above Working Space
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| Nominal Voltage Between Phases | Elevation |
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| ------------------------------ | ----------------- |
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| 1001--7500 V | 2.7m (9 ft) |
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| 1001--7500 V | 2.7m (9 ft) |
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| 7501--35,000 V | 2.9m (9 ft 6 in.) |
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Over 35 kV Add 9.5 mm per kV above 35 kV
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