125 lines
5.1 KiB
Markdown
125 lines
5.1 KiB
Markdown
---
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id:
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aliases:
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- nec-110
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tags:
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- authorship/other
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- destiny/uncertain
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- status/incomplete
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- topic/electrical
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- type/media
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title: Article 110 Requirements for Electrical Installations
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---
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# Article 110 Requirements for Electrical Installations
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## Part I. General
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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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access to and spaces about electrical conductors and equipment;
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enclosures intended for personnel entry;
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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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<!-- TODO: TEXT OMITTED -->
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### 110.14 Electrical Connections.
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Because of different characteristics of dissimilar metals,
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devices such as pressure terminal
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or pressure splicing connectors and soldering lugs
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shall be identified for the material of the conductor
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and shall be properly installed and used.
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Conductors of dissimilar metals
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shall not be intermixed in a terminal or splicing connector
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where physical contact occurs between dissimilar conductors
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(such as copper and aluminum or aluminum and copper-clad aluminum),
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unless the device is identified for the purpose and conditions of use.
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Materials such as solder, fluxes, inhibitors, and compounds,
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where employed, shall be suitable for the use
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and shall be of a type that will not adversely affect
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the conductors, installation, or equipment.
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Connectors and terminals for conductors more finely stranded
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than Class B and Class C stranding as shown in Chapter 9, Table 10,
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shall be identified for the specific conductor class or classes.
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#### 110.14(C) Temperature Limitations.
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The temperature rating associated with the ampacity of a conductor
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shall be selected and coordinated so as not to exceed the lowest
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temperature rating of any connected termination, conductor, or device.
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Conductors with temperature ratings higher than specified for
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terminations shall be permitted to be used
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for ampacity adjustment, correction, or both.
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##### 110.14(C)(1) Equipment Provisions.
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The determination of termination provisions of equipment
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shall be based on 110.14(C)(1)(a) or (C)(1)(b).
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Unless the equipment is listed and marked otherwise,
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conductor ampacities used in determining equipment termination provisions
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shall be based on Table 310.16 as appropriately modified by 310.12.
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* (a) Termination provisions of equipment for circuits rated 100 amperes or less,
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or marked for 14 AWG through 1 AWG conductors,
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shall be used only for one of the following:
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* (1) Conductors rated 60°C (140°F).
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* (2) Conductors with higher temperature ratings,
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provided the ampacity of such conductors
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is determined based on the 60°C (140°F) ampacity of the conductor size used.
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* (3) Conductors with higher temperature ratings
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if the equipment is listed and identified for use with such conductors.
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* (4) For motors marked with design letters B, C, or D,
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conductors having an insulation rating of 75°C (167°F) or higher
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shall be permitted to be used,
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provided the ampacity of such conductors
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does not exceed the 75°C (167°F) ampacity.
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* (b) Termination provisions of equipment
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for circuits rated over 100 amperes,
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or marked for conductors larger than 1 AWG,
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shall be used only for one of the following:
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* (1) Conductors rated 75°C (167°F)
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* (2) Conductors with higher temperature ratings,
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provided the ampacity of such conductors
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does not exceed the 75°C (167°F) ampacity of the conductor size used,
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or up to their ampacity if the equipment is listed and identified
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for use with such conductors
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##### 110.14(C)(2) Separate Connector Provisions.
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Separately installed pressure connectors shall be used with conductors at the ampacities not exceeding the ampacity at the listed and identified temperature rating of the connector.
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Informational Note:
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With respect to 110.14(C)(1) and (C)(2),
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equipment markings or listing information may additionally restrict
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the sizing and temperature ratings of connected conductors.
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#### 110.14(D) Terminal Connection Torque.
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Tightening torque values for terminal connections
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shall be as indicated on equipment
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or in installation instructions provided by the manufacturer.
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An approved means shall be used to achieve the indicated torque value.
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Informational Note No. 1:
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Examples of approved means of achieving the indicated torque values
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include torque tools or devices such as shear bolts
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or breakaway-style devices with visual indicators
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that demonstrate that the proper torque has been applied.
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Informational Note No. 2:
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The equipment manufacturer can be contacted
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if numeric torque values are not indicated on the equipment
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or if the installation instructions are not available.
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Informative Annex I of UL Standard 486A-486B, Standard for Safety-Wire Connectors,
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provides torque values in the absence of manufacturer's recommendations.
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Informational Note No. 3:
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Additional information for torquing threaded connections and terminations
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can be found in Section 8.11 of NFPA 70B-2019, Recommended Practice for Electrical Equipment Maintenance.
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