110 – Requirements for Electrical Installations
110.3(B) – Examination, Identification, Installation, Use, and Listing (Product Certification) of Equipment
Reason for Change:
Listing requirements were modified for clarity and usability to address equipment that is listed, labeled, or both.
110.3 Examination, Identification, Installation, Use, and Listing (Product Certification) of Equipment.
(B) Installation and Use. Listed or labeled equipment Equipment that is listed, labeled, or both shall be installed and used in accordance with any instructions included in the listing or labeling.
110.12(C) – Mechanical Execution of Work
Reason for Change:
Redundant requirements for “Mechanical Execution of Work” for communication cables and conductors in Chapter 7 and 8 were relocated to Article 110.
110.12 Mechanical Execution of Work.
Electrical equipment shall be installed in a neat and workmanlike manner.
(C) Cables and Conductors. Cables and conductors installed exposed on the surfaces of ceilings and sidewalls shall be supported by the building structure in such a manner that the cables and conductors will not be damaged by normal building use. Such cables and conductors shall be secured by hardware including straps, staples, cable ties, hangers, or similar fittings designed and installed so as not to damage the cable. The installation shall also conform with 300.4 and 300.11. Nonmetallic cable ties and other nonmetallic cable accessories used to secure and support cables in other spaces used for environmental air (plenums) shall be listed as having low smoke and heat release properties.
Informational Note No. 1: Accepted industry practices are described in ANSI/ NECA/FOA 301-2009, Standard for Installing and Testing Fiber Optic Cables, and other ANSI-approved installation standards.
Informational Note No. 2: See 4.3.11.2.6.5 and 4.3.11.5.5.6 of NFPA 90A-2018, Standard for the Installation of Air-Conditioning and Ventilating Systems, for discrete combustible components installed in accordance with 300.22(C).
Informational Note No. 3: Paint, plaster, cleaners, abrasives, corrosive residues, or other contaminants may result in an undetermined alteration of optical fiber cable properties.
110.14(D) – Electrical Connections, Terminal Connection Torque
Reason for Change:
Revisions occurred to the terminal connection torque rules and three new Informational Notes were added.
110.14 Electrical Connections.
(D) Installation Terminal Connection Torque. Where a tightening torque is indicated as a numeric value on equipment or in installation instructions provided by the manufacturer, a calibrated torque tool shall be used to achieve the indicated torque value, unless the equipment manufacturer has provided installation instructions for an alternative method of achieving the required torque. Tightening torque values for terminal connections shall be as indicated on equipment or in installation instructions provided by the manufacturer. An approved means shall be used to achieve the indicated torque value.
Informational Note No. 1: Examples of approved means of achieving the indicated torque values include torque tools or devices such as shear bolts or breakaway-style devices with visual indicators that demonstrate that the proper torque has been applied.
Informational Note No. 2: The equipment manufacturer can be contacted if numeric torque values are not indicated on the equipment or if the installation instructions are not available. Informative Annex I of UL Standard 486A-486B, Standard for Safety-Wire Connectors, provides torque values in the absence of manufacturer’s recommendations.
Informational Note No. 3: Additional information for torqueing threaded connections and terminations can be found in Section 8.11 of NFPA 70B-2019, Recommended Practice for Electrical Equipment Maintenance.
110.22(A) – Identification of Disconnecting Means
Reason for Change:
Disconnects are now required to identify of the source of the branch circuit or feeder for the disconnect at the disconnecting means enclosure (other than one- or two-family dwellings).
(A) General. Each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so the purpose is evident. In other than one- or two-family dwellings, the marking shall include the identification of the circuit source that supplies the disconnecting means. The marking shall be of sufficient durability to withstand the environment involved.
110.22 Identification of Disconnecting Means.
Reason for Change:
Revisions to “Large Equipment” working space to addresses the hazards presented by two or more service disconnects with combined ratings of 1200 amps or more. Requirements also added to prevent open equipment doors from impeding the entry to or egress from the working space of large equipment.
110.26 Spaces About Electrical Equipment.
(C) Entrance to and Egress from Working Space.
(2) Large Equipment. For large equipment rated 1200 amperes or more and over 1.8 m (6 ft) wide that contains overcurrent devices, switching devices, or control devices, there shall be one entrance to and egress from the required working space not less than 610 mm (24 in.) wide and 2.0 m (6 ½ ft) high at each end of the working space. This requirement shall apply to either of the following conditions:
(1) For equipment rated 1200 amperes or more and over 1.8 m (6 ft) wide
(2) For service disconnecting means installed in accordance with 230.71 where the combined ampere rating is 1200 amperes or more and over 1.8 m (6 ft) wide.
Open equipment doors shall not impede the entry to or egress from the working space.
A single entrance to and egress from the required working space shall be permitted where either of the conditions in 110.26(C)(2)(a) or (C)(2)(b) is met.
(a) Unobstructed Egress. Where the location permits a continuous and unobstructed way of egress travel, a single entrance to the working space shall be permitted.
(b) Extra Working Space. Where the depth of the working space is twice that required by 110.26(A) (1), a single entrance shall be permitted. It shall be located such that the distance from the equipment to the nearest edge of the entrance is not less than the minimum clear distance specified in Table 110.26(A)(1) for equipment operating at that voltage and in that condition.
110.26(C)(3) – Spaces About Electrical Equipment
Reason for Change:
Revision added to clarity appropriate hardware (equipped with listed panic hardware or listed fire exit hardware) for personnel doors within 7.6 m (25 ft) from the working space around electrical equipment rated 800 amperes or more.
110.26 Spaces About Electrical Equipment.
(3) Personnel Doors. Where equipment rated 800 amperes or more that contains overcurrent devices, switching devices, or control devices is installed and there is a personnel door(s) intended for entrance to and egress from the working space less than 7.6 m (25 ft) from the nearest edge of the working space, the door(s) shall open in the direction of egress and be equipped with listed panic hardware or listed fire exit hardware.
Informational Note: For information on panic hardware, see UL 305, Standard for Safety for Panic Hardware. For fire exit hardware, see UL 305, Standard for Panic Hardware, and UL 10C, Standard for Safety for Positive Pressure Fire Tests of Door Assemblies.