12' - 6" x 9' - 0" x 9' - 0"
"Straight" Electrical
Distribution Manhole

Precast Concrete Straight Electrical Manhole

Precast Concrete Straight Electrical Manhole

Precast Concrete Straight Electrical Manhole

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Typical Precast Concrete Manhole Installation

 

 

Precast Concrete Straight Electrical Manhole
 
 
 
 

Precast Concrete Straight Electrical Manhole
Concrete: 5,000 psi @ 28 days
                  5% - 8% entrained air
Rebar: ASTM A-615 grade 60 epoxy coated
Available duct entrances: Standard duct terminators to accept 5" Ø Sch 40 PVC
                                              conduit
Design criteria: a) Meets ComEd* spec #C4381.A dated 5-1-95 and EM-14927
                            dated 9-1-92
                            b) ASTM C858
                            c) Loading per ASTM C857, including:
                              -Earth cover: Min 1' - 0" Max 5' - 0"
                              -AASHTO HS-20 wheel load & applicable impact
                              -Vertical & lateral soil pressures determined using 120 PCF 
                               soil density 
                              -Ground water at 3' - 0" below grade
                           c) Structural design performed using AASHTO strength design
                           d) Reinforcing cover per ACI 318
Weight:  a) Top section: 20,920#
               b) Base section: 19,540#
               c) Total manhole: 40,460#

Precast Concrete Straight Electrical Manhole

Item Description Qty.
1 Cable rack inserts: 1/2" Ø 304 stainless threaded inserts each with 1/2" Ø x 2" 304 S hex head bolt, 1/2" SS washer and 1/2" PVC washer 32
2 SS pulling irons 2
3 4T lifting anchors 8
4 20" Ø sump opening 1
5 1" butyl rubber joint sealant 5 rolls
6 Rebar, epoxy coated
7 5" Ø duct terminator 36
8 1" Ø x 5-1/2" ground wire hole 1/2" KO 2
9 1/4" Ø plastic threaded inserts
1/4" x 1" hex head SS bolt
1/4" x 1/4" Nylon Strap
22
10 Ladder insert 3/8" Ø threaded carbon steel 4

Precast Concrete Straight Electrical Manhole
Cast Iron Frame and Vented Cover
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Electrical Distribution Hardware Chart
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