Wisconsin WisDOT Standard Specifications (within FDM) — Section 652

Effective with the December 2018 Letting 470 2019 Standard Spec ifications Section 652 Electrical Conduit

652.1Description

(1)This section describes providing rigid metallic or rigid nonme tallic conduit for traffic signals, lighting,

and other electrical work, and rigid nonmetallic conduit for tr affic signal detectors.

652.2Materials

652.2.1 General

(1)Furnish electrical conduit and fittings with a UL or NRTL labe l on each piece installed.

652.2.2 Rigid Metallic Conduit

(1)Furnish conduit and fittings con forming to ANSI C 80.1 for rigid metallic conduit.

652.2.3 Rigid Nonmetallic Conduit

(1)Furnish PVC electrical conduit conforming to UL 651. Use sched ule 40 heavy wall type for enclosed

locations. Use schedule 80 ext ra-heavy wall type for locations exposed to the elements. 652.2.4 Reinforced Therm osetting Resin Conduit

(1)Furnish reinforced thermosetti ng resin conduit (RTRC) electrical conduit marked type AG conforming

to UL 2515. Ensure that wall th ickness, coupling type or method , fittings, and hanger system conform to manufacturer recommendations for installation on the outside of structures. 652.2.5 Loop Detector Conduit

(1)Furnish one-inch schedule 40 PVC electrical conduit conforming to 652.2.3 . Use PVC fittings and

attachments designed specifica lly for the conduit furnished to join and terminate PVC conduit. Use engineer-approved PVC terminal adaptor fittings to connect cast iron T-condulets to PVC conduit.

(2)Furnish cast iron T-condulets made by a department-approved ma nufacturer. Use steel, domed-type,

wedge-nut style covers with neoprene gaskets on cast iron condu lets.

652.3Construction 652.3.1 Installation of Conduit

652.3.1.1 General

(1)Under the Conduit Special bid item, the contractor may use eit her rigid metallic or rigid nonmetallic

conduit.

(2)Use conduit of the nominal insid e diameter the plans show. Make each run of condui t the distance the

plans show or as the engineer directs. Inst all each run of cond uit between adjacent access points using one size for its entire length. A run is the conduit from pull box to pull box, junction box to junction box, or pull box to j unction box. If the engineer appr oves, the contractor may substitute a larger size of conduit than the contract shows for that run. Delete 652.3.1.1(3), the department no longer allows drilled and open drain hole conduit installations.

(3)Install tracer wire in each conduit run that will receive futu re conductors as the conduit is laid. Unless

the contract specifies wire or cable, install a 12 AWG. XLP insulated, stranded, copper, 600-volt AC, wire. Provide wire 4 feet longer than the conduit run and doubl e it back at least 2 feet at each raceway access point. Anchor the tracer wire at each access point.

(4)Ream and thread the ends of rigid metallic conduit and use WSE C-approved bushings. If not installing

wire or cable, install engineer- approved threaded caps with ant i-seize compound applied to the threads.

(5)Cap or plug rigid nonmetallic conduit immediately after instal lation, unless the conduit terminates in a

pull box, and keep capped or plugged until installing the wire or cable. Install end bells on rigid nonmetallic conduit raceway access points before installing wir e or cable. Ream non-metallic conduits to eliminate internal sharp edges before installing end bells. Use only UL or NRTL listed adapter fittings to connect rigid nonme tallic conduit to rigid metallic conduit. 652.3.1.2 Installing Underground

(1)Unless the plans specify otherwise, install conduit in trenches excavated with vertical sides and of a

depth and width sufficient to acc ommodate the outside diameter of the conduit couplings. Lay the conduit at the depth below grade t he plans show. Backfill the trench with select material passing a one-inch sieve.

(2)Excavate trenches true to line and grade to provide the conduit uniform bearing throughout its length.

Do not backfill the trench befo re inspecting the conduit. Caref ully tamp the backfill in place as specified for placing backfill in layers in 651.3 . Place at least 0.7 cubic feet of size No. 2 coarse aggregate, as specified in 501.2.5.4.5 , directly under each drainage hole.

Effective with the December 2018 Letting 471 2019 Standard Spec ifications (3) If cinders are present when laying rigid conduit, encase the c onduit in at least 2 inches of concrete, or remove for at least 12 inches below the conduit and backfill th e excavation with suitable material.

(4)Apply an engineer-approved zinc-rich paint to field-cut threads not covered by fittings and to other

areas with damaged or missing zinc coating. Clean application a nd adjacent areas before painting. 652.3.1.3 Installing Conduit Special Underground

(1)Under the Conduit Special bid items, conform to 652.3.1.2 except install by jacking, boring, auguring,

or other engineer-approved methods that do not disturb the exis ting overlying pavement, curb and gutter, or sidewalk. Use conduits uitable for the installation method used. Repair pavement, curb and gutter, or sidewalk that the engineer determines damaged by the installation. 652.3.1.4 Installing on Structures

(1)Install conduit on structures as the plans show either by embe dding in concrete or mounting on the

outside of the structure. Unless specifically provided otherwis e, do not leave openings in the structure for subsequent conduit placement. Install engineer-approved exp ansion fittings where the conduit crosses an expansion joint in a structure. Install additional e xpansion fittings conforming to the WSEC and adjust for the ambient temperature at the time of concrete pour.

(2)If embedding conduit in concrete, hold it rigidly in place while pouring the concrete. Provide drainage

for embedded raceways.

(3)If mounting on the outside of the structure, use reinforced th ermosetting resin conduit (RTRC) and

hardware conforming to manufacturer recommendations. Use only m anufactured bends and sweeps. Do not make field bends. Ensure that the installer is certified by the manufacturer of the conduit and conforms to manufacturer recommendations for installation on th e outside of structures. Provide evidence of installer certification to the engineer before inst allation. 652.3.1.5 Constructing Loop Detector Slots

(1)Under the Loop Detector Slots bid item, construct slots in exi sting asphalt or concrete pavement for

loop detector conduit, as the plans show or the engineer directs.

(2)Construct by sawing the full w idth and depth of the slot, or b y sawing both edges of the slot full depth

and removing the remainder by c hipping, or other engineer-appro ved methods. Clean the slots with jets of water and compressed air; remove dirt, dust, and debris ; and thoroughly dry before installing the detector loop cond uit. Remove and dispose of surplus material. 652.3.1.6 Installing Loop Detector Conduit

(1)Under the Conduit Loop Detector bid item, provide loop detecto r conduit and related fittings as the

plans show.

(2)After installation, protect the loop detector conduit from any damage that could occur. Repair or

replace damaged loop detector conduit at no expense to the department. The engineer will approve the replacement or repair method, and the resulting finished wo rk. 652.3.2 Marking and Inspecting

(1)Mark the location of each conduit as the plans show.

(2)After the conduit installation i s complete, inspect each insta lled conduit before any wire is pulled.

During this inspection, ensure that the conduit raceway is fully open for its entire length. Replace any conduit that the engineer determines is crushed, damaged, or un satisfactory.

(3)If the engineer directs, expose the condu it at a randomly sele cted conduit arrow mark. If the distance

from that conduit's centerline to a plumb line projected down from the tip of the a rrow mark is more than six inches, expose all arro w marked conduits. Destroy arro w marks not meeting the six-inch limit and remark the conduit.

652.4Measurement

(1)The department will measure the Conduit Rigid Metallic, Condui t Rigid Nonmetallic, and Conduit

Reinforced Thermosetting Resin bid items by the linear foot acc eptably completed, measured along the conduit centerlin e from the centerline of fittings or, where there are no fittings, from the free ends of the conduit. The department w ill measure enginee r-specified drain duct from a pull box to a ditch or sewer.

(2)The department will measure the Conduit Special bid items by t he linear foot acceptably completed,

measured from pull box to pull box.

(3)The department will measure Cond uit Loop Detector by the linea r foot acceptably completed,

measured around the loop and fr om the loop to the nearest pull box.

(4)The department will measure Loop Detector Slots by the linear foot acceptably completed.

Effective with the December 2018 Letting 472 2019 Standard Spec ifications 652.5 Payment

(1)The department will pay for measured quantities at the contrac t unit price under the following bid

items: ITEM NUMBER DESCRIPTION UNIT

652.0100 -0199 Conduit Rigid Metallic (size) LF

652.0200 - 0399 Conduit Rigid Nonm etallic (schedule) (size) LF

652.0400 - 0599 Conduit Reinforced Thermosetting Resin (size) LF

652.0600 - 0699 Conduit Special (size) LF

652.0800 Conduit Loop Detector LF

652.0900 Loop Detector Slots LF

(2)Payment for the Conduit Rigid M etallic, Conduit Rigid Nonmetal lic, Conduit Reinforced Thermosetting

Resin, and Conduit Special bid items is full compensation for p roviding the conduit, conduit bodies, and fittings; for providing condui t hangers, clips, attachments, and fittings used to support conduit on structures; for pull wires or ropes; for expansion fittings and caps; for excavating, bedding, and backfilling, including any sand, concrete, or other required ma terials; for disposing of surplus materials; and for making inspections.

(3)Payment for the Conduit Special bid items also includes repairing overlying pavement, curb and gutter,

or sidewalk the contractor disturbs or damages.

(4)Payment for the Conduit Rigid Non metallic bid items also inclu des pull box drain duct the engineer

directs under the 653 Pull Box bid items.

(5)Payment for Conduit Loop Detect or is full compensation for pro viding materials, including conduit,

compacted backfill, surface sealer, pull wire, condulets, and c onduit fittings.

(6)Payment for Loop Detector Slots is full compensation for sawing; for chipping; for removing and

disposing of surplus material; and for cleaning the slot.

(7)The department will not pay ext ra for conduit the contractor substitutes under 652.3.1.1 . The

department will pay separately for tracer wires under the appropriate Electrical Wire bid items specified in 655.5 .

Effective with the December 2018 Letting 473 2019 Standard Spec ifications Section 653 Pull Boxes and Junction Boxes

653.1Description

(1)This section describes providi ng, adjusting, and removing pull boxes and providing junction boxes.

653.2Materials

(1)Furnish steel pull boxes made o f corrugated steel pipe conforming to the material requirements of

521.2 with annular corrugations.

(2)Furnish non-conductive pull boxes and junction boxes from depa rtment approved product list. The

contractor may field trim to customize pull box lengths.

(3)Furnish manhole frames and solid lids conforming to 611.2 . Use locking covers in pavement roadway

locations and on 12-inch pull boxes.

(4)Furnish grounding lugs and copper or stainless steel mechanica l connectors. Use stainless steel for

mechanical connections to pu ll boxes and junction boxes.

653.3Construction

(1)Provide pull boxes with manhole frames and solid lids. The con tractor may extend pull boxes as the

plans show using the same mater ial as the pull box. Saw extensi ons parallel to the annular ring and clamp to the pull box using a band manufactured for this purpos e. Excavate, place coarse aggregate drain material, and backfill as t he plans show. Dispose of surp lus or unsuitable material as specified under 205.3.12. Use covers stamped "WISDOT IT S" for communications pull boxes or "ELECTRIC" for other pull boxes.

(2)Under the Junction Boxes bid items, provide junction boxes mou nted and connected as the plans

show. Grounding lugs are not required in junction boxes with less than 50 volt AC.

(3)Under the Adjusting Pull Boxes bid item, move existing pull boxes to grade level. Excavate, adjust

subsurface components as required, and backfill as the plan det ails show. Dispose of surplus or unsuitable material as specified under 205.3.12 .

(4)Under the Removing Pull Boxes bi d item, excavate and remove ex isting pull boxes. Backfill with

material similar to the surrounding material. Dispose of surplus or unsuitable material as specified under 205.3.12.

653.4Measurement

(1)The department will measure the bid items under this section a s each individual box acceptably

completed.

653.5Payment

(1)The department will pay for measured quantities at the contrac t unit price under the following bid

items: ITEM NUMBER DESCRIPTION UNIT

653.0100 - 0149 Pull Boxes Steel (size) EACH

50 - 0179 Pull Boxes Nonconductive (size) EACH

80 Pull Boxes Steel Communications (inch) EACH

653.0200 - 0299 Junction Boxes (size) EACH

653.0900 Adjusting Pull Boxes EACH

05 Removing Pull Boxes EACH

(2)Payment for the Pull Boxes bid items is full compensation for providing pull boxes; for materials

including grounding lugs; for aggregate, manhole frames and covers; for required pull box extensions; conduit extensions less than 10 feet long including fittings; and for excavating, backfilling, and disposing of surplus material. The department will pay separately for engineer-directed pull box drain duct under the Conduit Rigid Nonmetallic bid items as specified in 652.5 .

(3)Payment for the Junction Boxes bid items is full compensation for providing materials including

grounding lugs and stainless st eel mounting hardware, wiring, supports, grout, and temporary asphalt; for any pavement cutting and grouting; and for disposing of sur plus material.

(4)Payment for Adjusting Pull Boxes is full compensation resettin g the box elevation; for required

materials; and for excavating, backfilling, and disposing of su rplus material.

(5)Payment for Removing Pull Boxes is full compensation for removal, and for excavating, backfilling,

and disposing of surplus material.

Source: Wisconsin Standard Specifications for Highway and Structure Construction, 2019 Edition. Pages 479–481 of 601.

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651 General Requirements for Electrical Work

653 Pull Boxes and Junction Boxes