General
Equipment that is listed, labeled, or both, or identified for a use shall be installed and used in accordance with any instructions included in the listing, labeling, or identification.
Part I General
110.3 Examination, Identification, Use, and Listing (Product of Certificate) of Equipment
(B) Installation and Use.
The insulation of grounded conductors of 6 AWG or smaller shall be identified by one of the following means:
(1) A continuous white outer finish.
(2) A continuous gray outer finish.
200.6 Means of Identifying Grounded Conductors.
MV Conductors shall be of aluminum, copper-clad aluminum, or copper unless otherwise specified.
315 Medium Voltage Conductors, Cable, Cable Joints, and Cable Terminations
Part II Construction Specifications
315.12 Conductors
(B) Conductor Material
Receptacles incorporating equipment grounding conductor connection intended for the reduction of electromagnetic interference as permitted in 250.146(D) shall be identified by an orange triangle located on the face of the receptacle.
406 Receptacles, Cord Connectors, and Attachment Plugs (Caps)
406.3 Receptacle Rating and Type
(E) Isolated Ground Receptacles
Power supply cords for audio equipment shall be listed and shall be permitted to be used where the interchange, maintenance, or repair of such equipment is facilitated through the use of a power-supply cord.
640 Audio Signal Processing, Amplification, and Reproduction Equipment
Part III. Portable and Temporary Audio System Installations
640.42 Use of Flexible Cords and Cables.
(A) Between Equipment and Branch-Circuit Power.
Unused openings, other than those intended for the operation of equipment, those intended for mounting purposes, or those permitted as part of the design for listed equipment, shall be closed to afford protection substantially equivalent to the wall of equipment.
Part I General
110.12 Mechanical Execution of Work
(A) Unused Openings.
Where more than one neutral conductor associated with different circuits is in an enclosure, grounded circuit conductors of each circuit shall be identified or grouped to correspond with the ungrounded circuit conductor(s) by wire markers, cable ties, or similar means in at least one location within the enclosure.
200.4 Neutral Conductors
(B) Multiple Circuits
Noncombustible Surfaces that are broken or incomplete shall be repaired so there will be no gaps or open surfaces greater than 3 mm (1/8 in.) at the edge of the cabinet or cutout box employing a flush-type cover.
312 Cabinets, Cutout Boxes, and Meter Socket Enclosures
Part I. General
312.4 Repairing Noncombustible Surfaces.
Switches or circuit breakers shall not disconnect the grounded conductor of a circuit.
404 Switches
Part I General
404.2 Switch Connections
(B) Grounded Conductors
Each operating room shall be provided with a minimum of 36 receptacles divided between at least two branch circuits. At least 12 receptacles, but not more than 24, shall be connected to either of the following:
(1) The normal system branch circuit required in 517.19(A)
(2) A critical branch circuit supplied by a different transfer switch than the other receptacles at the same location
517 Health Care Facilities
Part II. Wiring and Protection
517.19 Category 1 Spaces
(C) Operating Room Receptacles
(1) Minimum Number and Supply
Where switches, cutouts, or other equipment operating at 1000 volts, nominal, or less are installed in a vault, room, or enclosure where there are exposed live parts or exposed wiring operating at over 1000 volts, nominal, the high-voltage equipment shall be effectively separated from the space occupied by low-voltage equipment by a suitable partition, fence, or screen.
Part III Over 1000 Volts, Nominal
110.34 Work Space and Guarding
(B) Separation from Low-Voltage Equipment
Overhead spans of open conductors and open multiconductor cables of not over 1000 volts, nominal, shall have a clearance of not less than the following:
(1) 3.0m (10 ft) - above finished grade, sidewalks, or from any platform or projection that will permit personal contact where the voltage does not exceed 150 volts to ground and accessible to pedestrians only.
(2) 3.7m (12 ft) - over residential property and driveways, and those commercial areas not subject to truck traffic where the voltage does not exceed 300 volts to ground
225 Outside Brand Circuits and Feeders
225.18 Clearance for Overhead Conductors and Cables
*See City of Fairbanks Ordinance 6154
changed 10 ft -> 12.5 ft
changed 12 ft -> 14 ft
Expansion splice plates for cable trays shall be provided where necessary to compensate for thermal expansion and contraction.
392 Cable Trays
Part II Installation
392.44 Expansion Splice Plates
All panelboards shall have a rating not less than the minimum feeder capacity required for the load calculated in accordance with Part III, IV, or V or Article 220, as applicable.
408 Switchboards, Switchgear, and Panelboards
Part III Panelboards
408.30 General
In Class I, Divisions 1 and 2, splices and taps shall not be made in fittings intended only for sealing with compound; nor shall other fittings in which splices or taps are made be filled with compound.
501 Class I Locations
Part II Wiring
501.15 Sealing and Drainage
(C) Class 1, Division 1 and 2
(4) Splices and Taps
Manholes, vaults, and their means of access shall be designed under qualified engineering supervision and shall withstand all loads likely to be imposed on the structures.
Part V. Manholes and other Electrical Enclosures Intended for Personnel Entry
110.71 Strength.
If ungrounded conductors are increased in size for any reason...wire-type equipment grounding conductors, if installed, shall be increased in size proportionately to the increase in circular mil area of the ungrounded conductors.
250 Grounding and Bonding
Part VI Equipment Grounding and Equipment Grounding Conductors
250.122 Size of Equipment Grounding Conductors
(B) Increased in Size
For systems rated over 1000VAC, suitable covers shall be installed on all boxes, fittings, and similar enclosures to prevent accidental contact with energized parts or physical damage to parts or insulation.
305 General Requirements for Wiring Methods and Materials for Systems Rated Over 1000VAC, 1500VDC, Nominal
305.7 Covers Required
Motor control circuit devices with screw-type pressure terminals used with 14 awg or smaller copper conductors shall be torqued to a minimum of 0.8 N-m (7 lb-in) unless identified for a different torque value.
430 Motors, Motor Circuits, and Controllers
430.9 Terminals
(C) Torque Requirements
Intrinsic Safety as a protection technique shall be permitted for equipment in Class I, Division 2 or Division 2; Class II, Division 1 or Division 2; or Class III, Division 1 or Division 2 locations.
500 Hazardous (Classified) Locations, Class I, II, & III, Divisions 1 & 2.
500.7 Protection Techniques.
(E) Intrinsic Safety.
Locking provisions for a cord-and-plug connection shall not be required to remain in place without the lock installed.
Part I General
110.25 Lockable Disconnecting Means.
Exception.
For one-family dwelling, the service disconnecting means shall have a rating of not less than 100 amperes, 3-wire.
230 Services
Part VI Service Equipment - Disconnecting Means
230.79 Rating of Service Disconnecting Means
(C) One-Family Dwellings
What is the minimum size metal box needed for four single phase circuits splicing in a homerun box? The homeruns are pulled in a 1" EMT with #10 AWG conductors plus a #10AWG EGC. The branch circuits are #12 AWG conductors including #12 AWG EGCs leaving in 2 separate 1/2" EMT conduits.
314 Outlet, Device, Pull, and Junction Boxes
314.16 Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies.
T314.16(B)(1) Volume Allowance Required per conductor
T314.16(A) Metal Boxes
#10 = 2.5 in^3, #12 = 2.25 in^3
2.5 x 9 + 2.25 x 8 = 40.5 in^3
Therefore 4-11/16" x 2-1/8" boxes is the only one large enough @ 42 in^3
Wiring located above heated ceilings shall be spaced not less than 50 mm (2 in) above the heated ceiling.
424 Fixed Electric Space-Heating Equipment
Part V Electric Space-Heating Cables
424.36 Clearances of Wiring in Ceilings
Cable Substitutions for power-limited circuits allow CMP, CL3P, CL2P, CMR, and CL3R to be substitutes for CL2R.
722 Cables for Power-Limited Circuits and Fault-Managed Power Circuits
135 Installation of Cables
(E) Cable Substitutions
T722.135(E) Cable Substitutions