CON EDISON SPECIFICATIONS
no. 6 - Section 7 EO-1042-18
Field Manual No 17 - Section 1
SCOPE - This specification covers pre-cast concrete
conduit used for housing electrical
APPLICATION - This specification applies to
all Con Edison districts
GENERAL - This specification covers the materials,
design, manufacture, testing,
and identification of straight and bend sections of pre-cast
Cement - The cement used shall be Portland Cement.
It shall conform to
the requirements of the Standard Specification for Portland
cement of the
American Society for Testing and Materials, ASTM designation
Aggregates - Aggregates shall conform to the
requirements of the
Specification for Concrete Aggregates, ASTM c33.
Water - The water used in mixing mortar or concrete
shall be free from
oil, acids alkalies, or vegetable matter.
Admixtures - No hardening or curing agent shall
be used in the
manufacture of the conduits and adapters.
Straight Sections - The conduit shall be of
a square external cross section,
a smooth concentric bore and accompanying dimensions as specified
Bends - The conduit along its entire length
shall have smooth concentric
bore, square external cross section and accompanying dimensions
specified on Drawing EO 9489-C.. Dimensions of the conduit
be determined by its radius and central angle.
Adapters - Adapters along their entire length
shall have a smooth
concentric, bore, square external cross section and accompanying
dimensions as specified on Drawings EO 9947-D, EO 9962-D,
11048-D and EO 11049-D. They shall be measured along the body
the conduit inclusive of the male ends.
Bell End Conduit - The conduit along its entire
length shall have a smooth
concentric bore, square external cross section and accompanying
dimensions as specified on Drawings EO 9799-D. The longitudinal
dimension of the conduit shall be straight and measured along
the body of
the conduit inclusive of the mail end. Bell-end conduit shall
be furnished for
use at manhole entrances. The bell-end shall be installed
flush with inside
face of the manhole.
Method of Joining - Conduits shall have heavy
male-ends which mate with
a plastic coupling as indicated in EO-9490D. They shall be
joined with a
force fit having sufficient pressure to prevent foreign matter
The conduits, bends and adapters shall be made to meet
the inspection and
test requirements outlined in this specification. The conduits,
adapters shall be air-cured for a 28 day period before delivery.
curing may be used upon specific approval from the Distribution
Conduit bends and adapters made in a form shall be
manufacture so as to produce a dense and smooth product with
The mix shall have a low water content in order to
produce a no-slump
All conduits and adapters shall be free from cracks,
broken ends, defects
or irregularities. The inner surface shall be smooth and free
blisters, loose sand or concrete. The finished product shall
be free of
foreign matter and shall conform to the dimensions and tolerances
on the appropriate drawings.
All conduits shall be subject to inspection at the
factory, Company yard,
trench or other points of delivery by an inspector employed
Company. Conduits that do not conform to this Specification
rejected. Bundles containing faulty conduit shall be rejected
in their entirety.
Purpose - The company reserves the right to
test at its own expense any
or all conduits and adapters for the purpose of determining
with this specification.
Restrictions - Specimens that have been used
in any one of the strength
tests shall not be used for any other test.
Mandrel Test - A flexible steel mandrel as shown
on drawing EO-4410-c
and of a diameter ¼” less than the normal bore diameter shall
through each section of conduit.
Transverse Loading for Straight Sections - The
4’ long test specimen shall
be placed on two hardwood supports, 2inches square by 6 inches
placed 42 inches apart, center to center. The load shall be
between the supports, on a hardwood bearing block 2 inches
inches long and 1 inch thick, placed across the conduit. The
speed of the
cross head of the test machine shall be between 0.06 and 0.08
minute. The minimum breaking load shall be 2,500 pounds for
and 3,500 pounds for 5 inch conduit. The Company reserves
the right to
also test 2’ long straight sections.
Transverse loading for bend sections - Conduit
bends, 2’ long with 5’, 10’
or 20’ radius shall be placed on supports consisting of 1
rollers, 6 inches long, located 21 inches center to center.
The load shall be
applied on the crown of the duct midway between the supports
on a 2
inch flat plate 6 inches long, placed across the conduit.
The speed of the
cross head of the test machine shall be between 0.03 and 0.04
minute. The test breaking load shall exceed 4,800 pounds for
and 6,000 pounds for 5 inch conduits.
Compression (Load Crushing) Test - The specimen
for the compression or
load crushing test shall have a nominal length of 12 inches.
Its faces shall be
smooth and level with no surface irregularities. The specimen
shall then be
tested between two, flat, hardwood blocks in a standard
The wood blocks shall be 2 inches thick and the contact surfaces
approximately ¼ inch longer than the surface dimensions of
If the bottom and top surfaces of the specimen are not smooth
then they must be capped parallel with hydrostone or equal
to allow for a uniform
spread of the test load. The speed of the cross head of the
machine shall be between 0.03 and 0.04 inches per minute.
The load shall
be increased until the specimen fractures or drop in load
is indicated on the
test machine. The breaking load shall exceed 4,900 pounds
for 4 inch
conduit and 6,000 pounds for 5 inch conduit. The Company reserves
right to also test 2’ long and 4’ long sections.
Friction Test - The test specimen shall be a
four foot straight section placed
in a horizontal position. The test shall be performed measuring
required to keep a 2 ½ standard steel pipe, 2 7/8 O.D., 12
long moving through
the conduit at approximately 1 foot per second. The steel
shall be uniformly weighted after its weighted edges shall
be rounded. The formula
for calculation of the coefficient of friction is as follows:
= Dry sliding coefficient of friction
Weight of pipe in pounds
T = Tension to move pipe in pounds
this test two 4’ sections of pipe will be selected at random
tests shall be made with the duct on each of the four sides.
A dry sliding
of friction of less than 0.4 is required.
The Company shall accept only conduit which fully meets
requirements of this Specification. Failure of 2% of a conduit
shipment to meet the requirements shall be cause for rejection
of the entire shipment. All rejected conduits shall be unmistakably
identified, removed and replaced with conduits which meet
the requirements of this Specification.
Straight Sections - Straight conduits shall
be identified with name of
manufacturer and year of manufacture.
Adapters - Adapters shall be identified with
name of manufacturer and
type designation using ink and 2 inch minimum height figures
each adapter as follows:
Adapter Type 4H-3 ½ K, 4H-3K, 4H-2K,
5H-4K to receive Plastic Coupling and 4", 3 ¼",
3", 2" Korduct, Steel, Fiber, FRP or Schedule
40 PVC Conduit.
Adapter Type 4H-4LM, 5H-5LM to receive
Plastic Coupling and 4" or 5" Light Male End
Pre-cast Concrete Conduit.
Adapter Type 4H-4F, 5H-5F to receive
Plastic Coupling and 4" or 5" Female End Pre-cast
Bend Sections - Bends shall be identified as
to manufacturer and type in
accordance with Drawing EO 9489-C, latest revision.
EO-4410 C......."Mandrel for Clearing Ducts"
used with Pre-cast Conduit"
of Pre-cast Concrete Conduit"
Rev 8 - Pre-cast Concrete Conduit with Thick Male Ends
EO-9799-D Rev 5
- Pre-cast Concrete Conduit Bell End with Thick Male Ends
EO-9489-C Rev 9
- Pre-cast Concrete Conduit Bends with Thick Male Ends
EO-9947-D Rev 7
- Pre-cast Concrete Conduit Adapter Type 4H-4K Or 5H-5K
Plastic Coupling For Pre-Cast Concrete Conduit with Thick