14E-2-225  Outside branch circuits and feeders.
The provisions of Article 225 of NFPA 70 are adopted by reference with the following modifications:
1.   Revise section 225.10 to read:
Wiring on Buildings (or Other Structures). The installation of outside wiring on surfaces of buildings (or other structures) shall be permitted for circuits of not over 1,000 volts, nominal, as the following:
(1)   Type MI cable
(2)   Rigid metal conduit (RMC)
(3)   Intermediate metal conduit (IMC)
(4)   Electrical metallic tubing (EMT)
(5)   Messenger-supported wiring.”
2.   Insert new Part IV to read:
Part IV. Outside Lighting
225.70.General. Part IV lists the requirements for outside lighting on public and private property that are in addition to the requirements of 225.7.
225.71. Commercial Lighting on Public Property.
(A)   Supports. Commercial lighting on public property shall be supported on a post erected to support the post under the worst expected conditions.
Informational Note: For expected conditions in this area, see ANSI C2-2012, National Electrical Safety Code.
(B)   Location. Each post shall be installed so that the lower edge of the post shall be on a line with the upper edge of the street curb and the center of the post shall be not less than 557 mm (22 in.) from the outer edge of the curb. Where a number of posts are erected or where posts are erected in addition to existing posts, they shall be located so that the globes shall be in a line with each other.
Exception: In the case of exceptionally narrow sidewalks or where large diameter pole bases are used, the 557 mm (22 in.) dimension may be reduced by the Department of Transportation.
(C)   Separation from Fire Hydrants. No post shall be erected closer than 1.5 m (5 ft) to a fire hydrant.
(D)   Street Corners. Posts erected at street corners shall not be located in the area defined by extending the building lines or right-of-way lines, if no building is present, to the curb.
(E)   Spacing. Where more than one post is installed or where posts are installed in the immediate vicinity of other posts, spacing in any block shall be uniform and not less than 12.2 m (40 ft) nor more than 15.2 m (50 ft).
Exception: Where photometrics are acceptable to the Department of Transportation, a spacing greater than 15.2 m (50 ft) shall be permitted.
225.72. Commercial Lighting Foundations. All commercial lighting posts require concrete foundations. Concrete foundations shall be not less than 610 mm (24 in.) by 610 mm (24 in.) or 676 mm (27 in.) in diameter and shall extend below the frost line but not less than 914 mm (36 in.) below grade. Actual foundation dimensions shall be approved by the Department of Transportation.
Exception: Where commercial lighting is installed on vaulted walks or areas, a foundation shall not be required. All such supports and designs shall be first approved by the Department of Transportation.
225.74. Attachment to Concrete Foundation. Posts attached to concrete foundations shall be attached by a method which will permit the removal of the post from its foundation without damage to the post or foundation. Where the method of fastening is by means of a spider extending outward from the post base, the top of the foundation before the post is installed shall be left 76 mm (3 in.) below the top surface of the walk.
After the post has been aligned and fastened, the foundation shall be made flush with the top surface of the walk and no part of the spider or bolts shall project above the surface of the walk. In cases where posts are to be installed on unexcavated walk, the surface of the walk shall be recessed.
(A)   Posts Set on Concrete Foundations. Where posts are set on concrete foundations, they shall be attached by bolts extending into and firmly held by the concrete foundation for a distance of not less than 762 mm (30 in.) For concrete posts, there shall be a minimum of three bolts not less than 16 mm (5/8 in.) diameter. The bolts shall be set such that they shall not pull out of the concrete nor turn due to the screwing on of a nut.
(B)   Bolts. All bolts for attaching of posts shall be hot galvanized.
225.75.Concrete for Foundations. Concrete for foundations shall be made of at least 3,000 psi concrete mix with a minimum cement content of 470 lb/yd3 of concrete or shall be standard class SI concrete (IDOT Section 1020). Proper admixtures, such as air-entraining admixture (for concrete exposed to freezing and thawing) and water-reducing admixture (for placement and workability) shall be added to the concrete.
Informational Note: The use of Ready-Mix Concrete per ASTM C94 is recommended.
225.76. Conductors and Wiring for Commercial Lighting on Public Property. Conductors outside of buildings for post lighting circuits shall be installed in rigid metal conduit, intermediate metal conduit or Schedule 80 nonmetallic rigid conduit a minimum of 610 mm (24 in.) beneath the surface of the ground, sidewalks, streets, alleys or parkways, or be enclosed by the post. Conductors within buildings shall be run in suitable conduits.
(A)   Conductors. Conductors shall consist of a two or three wire cable not smaller than 12 AWG and have an approved insulation. Conductors smaller than 8 AWG shall be supported by a messenger.
(B)   Protection Against Physical Damage. Conductors shall be protected from physical damage in accordance with 300.5.
(C)   Metallic Sheath. The metallic sheath of cables shall be grounded.
(D)   Disconnects. Branch circuits supplying street posts shall be protected by fuses rated not more than 20 amperes.
(E)   Splices. Splices shall be made within approved junction boxes inside of buildings and in post heads outside of buildings.
225.81.Supports. Commercial lighting on private property shall be supported on a post erected to support the post under the worst expected conditions.
Informational Note No. 1: For expected conditions in this area, see ANSI C2-2012, National Electrical Safety Code.
Informational Note No. 2: Planking the pole, “raking” the pole during installation, and similar methods of support should be considered during design.
(A)   Materials. Supports may be standard wood poles, metal poles if suitably protected against corrosion, or clear timber. Except in hazardous locations, metal poles shall be provided with a hand hole through which the connections to the branch circuits shall be permitted to be made.
(B)   Size and Strength. Minimum strength shall be equivalent to a Class 5 wood pole and in no case less than that required by 225.81.
225.82. Conductors and Wiring for Commercial Lighting on Public Property. Conductors shall consist of a two or three wire cable not smaller than 12 AWG and have an approved insulation.
(A)   Conductors Smaller than 8 AWG. Conductors smaller than 8 AWG shall be permitted to be a twisted pair or run parallel and taped. They shall be attached to and supported by a messenger at intervals not exceeding 1.52 m (5 ft).
(B)   Conductors 8 AWG or Larger. Conductors No. 8 or larger shall use standard strain insulators at supports.
(C)   Conductor Spans. Spans attached to buildings shall not exceed 30.5 m (100 ft) in length. Spans supported by clear timbers shall not exceed 18.2 m (60 ft) in length.
(D)   Messenger Wires. Messenger wires shall be galvanized and not smaller than 10 AWG.
225.83. Clearances for Commercial Lighting on Public Property.
(A)   From Ground or Grade. Conductors shall be installed in accordance with the clearance requirements of 225.18.
(B)   Feeder Wires. Feeder wires shall be separated by at least 305 mm (12 in.) and supported on approved insulators of glass or porcelain when not in conduit.
225.84.Disconnects for Commercial Lighting on Public Property. Cutouts and switches installed outdoors shall be in standard weatherproof cabinets. Cabinets installed with the bottom less than 2.44 m (8 ft) above grade shall be locked.
225.85.Connections. Connections in sockets or receptacles shall be of the standard molded “pigtail” weatherproof type. Connections of socket wires shall be staggered.
225.90.Underground Branch Circuits. Where branch circuit conductors are from an underground feed, the requirements of (A) and (B) of this section shall apply.
(A)   Underground Branch Circuits Attached to Wood Poles. Where rigid metal conduit or flexible metal conduit, where approved, is used it shall be installed a minimum of 2.44 m (8 ft) up the pole and to within 457 mm (18 in.) of the lighting fixture and made electrically continuous and grounded. Where cord is used it shall contain a separate grounding conductor which shall be continuous back to the distribution cabinet.
(B)   Underground Branch Circuits Attached to Metal Poles. Rigid metal conduit shall be stubbed through the below grade and fitted with a grounding type bushing. The pole shall be bonded to the conduit with a minimum 8 AWG wire. Where direct buried conductors or cable or non-metallic raceway is used, a separate grounding conductor shall be provided back to the distribution cabinet. Where rigid metal conduit is used, all segments of the raceway system shall be bonded together and shall be permitted to be used as the ground.
225.91.Disconnects for Metal Poles. Approved fuseholders shall be permitted to be installed in metal poles provided that they are accessible to qualified personnel only and there are no live parts exposed.
225.92.Voltages Permitted. Voltages permitted shall be as indicated in 220.5(A). Voltages in excess of 250 volts to ground or 300 volts between phase conductors shall be permitted to be used only when the following conditions are met:
(1)   The lighting shall be installed not less than 6.7 m (22 ft) above grade
(2)   Each pole, if of metal construction, shall be grounded by one of the approved methods
(3)   Disconnects shall be located within sight of the lights they control, outdoors, preferably on one of the poles
(4)   Where the installation is large or if the location of the lighting does not permit all the lighting to be within sight, more than one disconnect shall be permitted to be installed
(5)   Where snap-switches or push-button type switches are used, the voltage across these switches shall be reduced to less than 250 volts to ground or 300 volts between phase conductors
(6)   Branch circuits shall be limited to not more than 50 ampere rating
(7)   The electrical system shall be under the supervision of a supervising electrician.”