electrical training part 1 - washington state … width shall be 4-inches or the conduit diameter...
TRANSCRIPT
![Page 1: Electrical training Part 1 - Washington State … width shall be 4-inches or the conduit diameter plus 2-inches. 5. Trenches located within paved roadway areas shall be backfilled](https://reader033.vdocuments.us/reader033/viewer/2022051800/5acbb2747f8b9aad468bd93e/html5/thumbnails/1.jpg)
Conduit
StandardSpecifications• 8-20.3(5)• 9-29.1
NEC Articles300, 343, 344, 350,352, 356, 358
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Ream Pipe8-20.3(5) Page 8-75
The ends of all conduits, metallic and non-metallic,shall be reamed to remove burrs and rough edges.8-20.3(5)
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Threading Galvanized Steel Conduit
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Threading on a Tri-pod
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New Thread Cut Not Square 8-20.3(5)
8-20.3(5) Field cuts shall be made square and true.
8-20.3(5) Page 8-75
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Coat New Threads with Galvanizing Repair Paint
8-20.3(5) Page 8-75
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Colloidal Copper
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3-Piece Coupling
Together Apart
8-20.3(5) Page 8-75
Slip joints or running threads will not be permitted for coupling metallic conduit. When installing RGS conduit, and a standard
coupling cannot be used, an approved 3 piece coupling shall be used. 8-20.3(5)
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Installing Copper Coat to Threads
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Screw It Together
i
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Geared Threader 2.5” to 4”
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Conduit Spacers
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Conduit On Bridge
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Conduit In Bridge Rail
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Conduit On Bridge, Deflection Fittings, & LB’s
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Conduit Bodies
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Conduit Fittings
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Expansion (AX) at Bridge End
Barrier DetailsTB Type F
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PVC Expansion Fitting
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PVC Expansion Fitting Poured Into Rail
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Deflection (DX) Fittings
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Deflection Fitting Cut In Half
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What Is Wrong With This Picture
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Corrosion Resistant Tape
Standard Plan J-16B Traffic Barrier detailsheets (Bridge sheets)
J-16 B
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Corrosion Tape
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Mounted Under Bridge
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Suspended Under a Bridge
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4 Inch Steel on Hangers
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Conduit in the TrenchConduit ends shall be capped 8-20.3(5)
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CDF
Sand
Road Crossing 8-20.3(5)1. The pavement shall be saw cut a minimum of 3-inches deep. The cuts shall be parallel to each other and extend 2 feet beyond the edge of the trench.2. Pavement shall be removed in an approved manner.3. Trench depth shall provide 2-feet minimum cover over the conduits.4. Trench width shall be 4-inches or the conduit diameter plus 2-inches.5. Trenches located within paved roadway areas shall be backfilled with controlled density fill (CDF) to the bottom of existing pavement. The pavement shall be replaced with paving material that matches the existing pavement.
Schedule 80 PVC
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Conduit Placed in Foundation
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Mechanical Seals Required in Cabinet Conduits
• NW Region Special Provisions 8-20.3(5)– All conduits entering pad mounted cabinets and all conduits
entering ITS hubs shall be sealed with an approved mechanical plug at both ends of the conduit run. Conduit duct seal will not be accepted. Pad mounted cabinets shall include, but not be limited to, service, signal controller, data station, CCTV, ramp meter, environmental sensor station, gate controller, cable terminal, and transformer cabinets.
• Approved products– Tyco Electronics TDUX– Tyco Electronics Jackmoon Triplex Duct Plug– O-Z/Gedney Conduit Sealing Bushing
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TriPlex Conduit Plugs
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T-DUX Seals
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TDUX by Tyco Electronics
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Triplex and Quadplex Plugs by Tyco Electronics “Jackmoon”
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O-Z/Gedney Conduit Sealing Bushing
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Innerduct Plugs
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Innerduct Nipple
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Unistrut on Bridge With Bolt in Bottom
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Conduit on Unistrut
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Conduit on Unistrut
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Surface Mounted Conduit• Stainless Steel Struts• Stops placed in each end of the struts• SS or galvanized two hole straps• Minimum 1-inch between straps• Minimum 1-inch from strap to end of strut• Maximum of 5 foot between struts• Struts 1-foot longer than needed for future• No surface mounted PVC
Standard Specifications 8-20.3(5)Page 8-78 and 79
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SS Two Hole Strap
Conduit clamps shall be two hole type straps, stainless steel or hot dip galvanized, except in marine environments, where type 316 stainless steel shall be used. 9-29.1
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Conduit PlacementConduits shall enter from the direction of the run and within
3-inches of the wall nearest its entry.
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Fractured Fin Back Form
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Minimal Bends Are Better
The conduit has to be installed near the back of the box.
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PVC in Cast in Place Bridge Rail
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Directional Boring Machine
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Directional Boring “Drill Heads”
Directional Indicator Inserts here
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Reamer
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Pick Your Spot and Drill
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Vacuum Trailer Picks up Bentonite Slurry
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Locator Finds Drilling Head Location
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Locator
Headed down 7 degrees
Spade at 11 o clock
134 inches deep
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Universal Joint Attached to Conduit Ready to Pull It Back
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Multiple Conduits in Same Bore
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Connect 4 HDPE Conduits
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Space can be a Challenge
1 - Three Inch3 – Two InchHDPE Conduits
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DirectionalBoring
Machine
DirectionOf
Bore
SR 18 from Military Rd. Bridge
A Tough Bore
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Pulling Back With Reamer
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HDPE
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HDPE Schedule 80
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HDPE to PVC Mechanical Coupler
No glue is allowed when installing the adaptors on the HDPE. Glue will soften the threads in the coupler and they will be flattened during installation. It will not be tight. Water based pulling lubricant may be used.
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Top left - Set up for the test.
Top right - Parts after failure.
Bottom - Max pull at 700 lbs. Pulled apart at 700 lbs.
HDPE
Mechanical Coupler
PVC
Testing Mechanical Coupler
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Innerduct in Trench, CDF, Ribbon
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26% Conduit Fill 1 ½” ConduitConductors 4 - #2
= 0.532 in^2
Conduit Fill For New Work(WSDOT design standard)
Adjustment factors for more than three conductors. (310.15(B)(2)(a)
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40% Conduit Fill 1 ½” ConduitConductors 4 - #2, 2 - #4, and 2 - #8
= 0.838 in^2
Conduit Fill For Adding to Existing Conduit
Chapter 9 Table 1 Over 2 conductors NEC is 40%.Adjustment factors for more than three conductors. (310.15(B)(2)(a)
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60% Conduit Fill 1 ½” Conduit Conductors 5 - #2,
2 - #4, 2 -#6, 3 - #8, 1 - #10, and 1 - #12 = 1.232 in^2
Conduit Fill At 60%(NEC Charter 9 Note 4 to Table 1)
(Nipples not longer than 24”)
Use for nipple fill only. Adjustment factors for more than three conductors would apply as per NEC (310.15(B)(2)(a).