HomeMy WebLinkAboutAgenda Report - October 16, 2002 E-06CITY OF LODI COUNCIL COMMUNICATION
AGENDA TITLE: Approve specifications and authorize advertisement for bids for
20,000 feet of 92/0 jacketed 15kv underground conductor (EUD)
MEETING DATE: October 16, 2002
PREPARED BY: Electric Utility Director
RECOMMENDED ACTION: That the City Council approve the specifications and authorize the
advertisement for bids for 20,000 feet of #2/0 jacketed 15kv
concentric neutral underground electrical cable.
BACKGROUND INFORMATION: A portion of this cable is required for the downtown cabling project,
and the remainder is being sourced in preparation for needs in early
2003.
An estimated 12,200 feet of conductor is required for system upgrades in the area encompassed by
Church, Elm, Sacramento and Walnut Streets, and the block bordered by School Street, Walnut,
Sacramento Street and Lodi Avenue. The balance of the bid amount, 7,800 feet, represents a portion of
the projected 2003 requirements. However, with actual 2003 needs still unclear, and storage space at a
premium, staff intends to secure a better 2003 requirements forecast before soliciting bids for additional
quantities of this #2/0 conductor.
FUNDING: Electric Utility Department Line Extensions
2001-2003 Financial Plan and Budget, Page. E-29
Estimated cost $23,000
BID OPENING: November 11, 2002
A /� a�K
Alan N. Vallow, Electric Utility Director
Prepared by Joel Harris, Purchasing Officer
cc: Manager, Engineering and Operations
APPROVED:
H. Dixo lynn — City Gnager
City of Lodi
Equipment Specification
15 W, TR-XLPE INSULATED, CONCENTRIC NEUTRAL CABLE
1.0 GENERAL
Cable furnished under these specifications shall be limited to 15 W single conductor URD
cable, stranded aluminum conductor, filled strand, triple extruded insulating system
consisting of a thermosetting conductor shield, high dielectric strength tree -retardant cross-
linked polyethylene insulation, thermosetting semiconducting insulation shield, bare copper
concentric neutral and encapsulating jacket. The cable shall be suitable for 90 degrees C
continuous and 130 degrees C emergency operating temperature. The cable shall be
designed for installation in ducts or for direct burial in earth, in wet or dry locations. Cable
furnished shall meet the requirements of the applicable NEMA, ICEA, AEIC and ASTM
Standards, latest edition thereof, unless otherwise noted in this specification.
2.0 CONDUCTOR
The insulated conductor shall be Class B, stranded or compressed strand 1350 aluminum
alloy, three-quarter hard meeting the requirements of ASTM 8231, B609. Conductor size
will be listed on the proposal forms (bid sheets).
3.0 STRAND FILLING COMPOUND
In order to prevent water propagation through the insulated conductor and to alleviate water
(electrochemical) treeing of the insulation, a strand filling compound shall completely fill the
voids between the conductor's inner strand layer(s). The compound used shall be flexible
and stable under the operating conditions imposed on the cable and as specified herein, and
compatible with the conductor, strand shield and insulation.
The outer surface of the conductor shall be free from the filling compound such that splices
and terminations can be readily applied using standard compression -type connectors and
utilizing the same techniques as for unfilled conductors.
4.0 CONDUCTOR SHIELD
The conductor (strand) shielding shall be an extruded virgin black semi -conducting
thermosetting polyethylene. The material shall be compatible with the conductor metal and
free stripping from the stranded conductor. The extruded shield shall meet AEIC CS5-94
Standard, Table D-1, for minimum point thickness. The outer surface of the conductor
shield shall be cylindrical and shall be firmly bonded to the overlaying insulation.
The contact area between the insulation and conductor shield shall not exhibit protrusions
or irregularities which extends from the cylindrical surface of the conductor shield by more
than 3 mils toward the insulation. Similarly, protrusions or irregularities shall not extend
more than 7 mils into the shield.
5.0 INSULATION
Insulation shall be unfilled, semi -transparent, tree -retardant, cross-linked thermosetting
polyethylene extruded directly over the conductor shield. The average insulation thickness
shall not be less than 220 mils and the minimum thickness shall not be less than 90% of this
value.
15kv_spec.doc Page 1 of Spec.#C-HV-10
Date: September 2002
6.0 INSULATION SHIELD
The insulation shielding shall be an extruded virgin black semi -conducting thermosetting
polyethylene. The thermosetting material shall be compatible with the insulation and the
overlying metallic shield. The insulation shield compound and thickness shall be in
conformance with AEIC CS5-94 Standard.
The contact area between the insulation and the insulation shield shall not exhibit
projections or irregularities which extend toward or away from the cylindrical insulation and
insulation shield interface by more than 10 mils.
The insulation shield shall strip cleanly from the insulation, leaving it free of any significant
residue of semi -conducting or other material, which would have to be removed prior to
installation of splices or terminations.
7.0 ECCENTRICITY
The maximum eccentricity (Tmax - Tmin) limit as specified in AEIC CS5-94 shall not be
exceeded.
8.0 CONSTRUCTION METHOD
Conductor shield, insulation and insulation shield shall be installed on the conductor using
the 'True -Triple" extruding, dry cure method.
9.0 CONCENTRIC NEUTRAL
The concentric neutral conductor shall be a number of round, annealed, bare copper wires
helically wrapped around the cable. The wires shall be spaced equidistant from each other
around the circumference of the cable with a length of lay to be not less than 6 or more than
10 times the cable diameter.
The size of the neutral wires shall be in the range of #14 to #9 AWG.
The number of neutral wires shall be sufficient to yield "FULL NEUTRAL" on #2 AWG cable
and "1/3 NEUTRAL" on all other cable sizes.
10.0 ENCAPSULATING JACKET
An extruded, encapsulating and insulating layer of linear, low density black polyethylene
shall be applied over the concentric neutral wires in accordance with ICEA S-66-524. The
minimum thickness of this encapsulating jacket over the concentric wires shall be as follows:
Conductor Size (AWG or kcmil) Minimum Thickness (mils)
#2 and #2/0 50
750 and 1000 80
11.0 MARKINGS
The encapsulating jacket shall be marked by means of surface or indent print with the
following information at intervals of not more than 2 feet:
1. Manufacturer and plant of manufacture.
2. Type and size of cable.
3. Type of insulation, thickness and insulation level.
4. Voltage rating.
5. Year of manufacture.
6. National Electric Safety Code "Lightning Bolt" symbol.
7. Footage markings in two foot increments.
(Beginning and ending footage numbers shall be indicated on a durable label
attached to a flange of the reel).
15kv_spec.doc Page 2 of 4 Spec.# C -HV -10
Date: September 2002
12.0 TESTING AND GUARANTEE
Testing of cable shall be performed according to procedures set forth by ICEA, AEIC and
ASTM Standards. Certified copies of pass/fail test results shall be supplied. Any cable
found defective either upon inspection, testing or installation will be returned at the
manufacturer's expense.
13.0 SPECIFIC REQUIREMENTS
Any conditional bid such as "subject to availability in stock" will be considered non
responsive and will be rejected. Cable shall be furnished according to Table 1 below:
Table 1
Conductor Size
AWG or kcmil
No. of Strands
Conc. Neutral
Size
Material Phase
(Neutral)
Insulation
Thickness (mils)
Reel Dimensions
(Dia. Tray. Drum)
#2 (7)
Full Neut.
Alum. (Cu.)
220
58-32-28
#2/0 (19)
1/3 Neut.
Alum. (Cu.)
220
58-32-28
750 (61)
1/3 Neut.
Alum. (Cu.)
220
784842
1000 (61)
1/3 Neut.
Alum. (Cu.)
220
78-4842
NOTE: Refer to proposal forms (bid sheets) for specific sizes and quantities.
14.0 REELS
1. Reels
Shall be "Heavy Duty Reuseable Wood Reels - Class 2" meeting NEMA Standards
Publication No. WC 26-2000 and EEMAC Standards Publication 201-2000, or latest
revision thereof. See Table 2 below:
Table 2
Heavy Duty Reuseable Wood Reels — Class 2
Reel Dimensions (Dia. Tray. Drum)(")
58-32-28
78-48-42
Min. Flange Thickness (")
2.125
3.00
Max. Overall Width (")
39.50
56.00
Arbor Hole Diameter(")
3.06
3.06
Min. Stave Thickness (")
1.250
1.375
Drive Pin Qty
2
2
Dia. (")
1.50
3.00
Radius (")
10.0
11.5
Test Hole (")
3.0
4.5
Bushing or Plate
see note "d"
Yes
Tie Rods (No. & Size)
6 x 3/8"
8 x 5/8"
Assembly Washers (")
2.5
3.0
Min. # Of Nail Rings
5
6
Notes
a. Washers are required on all bolts. Cup washers are permitted where gross
weight is not in excess of 6000 pounds. Flat washers to be a minimum
diameter of 3" with a minimum thickness of. 125".
b. Tapered cable test holes are required.
C. Headed nails are to be used, spaced 3 inches apart with a minimum
countersink of 1/16" on the cable side and a 1/8" clinch on the opposite side.
d. Metal bushings are required when gross weight is in excess of 2500 lbs.
15kv_spec.doc Page 3 of 4 Spec.# C -HV -10
Date: September 2002
2. Makeup and length:
Reels shall be shipped with cable to their full maximum cable capacity.
3. Packaging:
Reels containing 750 and 1000 kcmil cable shall have adequate protective covering
across the flanges. Such covering shall consist of wood members from flange to
flange covering the entire perimeter of the reel (lagging). The lagging shall be nailed
to the flange perimeter and shall be further secured with at least two steel bands
around the reel.
Reels containing #2 and #2/0 AWG cable shall be paper wrapped only, i.e. lagging
is not required.
Each end of the cable shall be firmly secured to the reel.
4. Marking:
Each reel shall be marked with two durable labels securely attached to each flange
of the reel and plainly marked and stating:
a. Destination.
b. Purchaser's purchase order number.
C. Shipping length of cable on reel.
d. Weight of reel (tare weight).
e. Weight of cable on reel.
f. Type and size of conductor.
g. Insulation type and thickness.
h. Voltage rating.
i. Manufacturer's identification number
j. Beginning and ending footage numbers of cable on the reel.
15.0 SHIPPING
Cable ends shall be adequately sealed with a water seal type material and heat shrinkable
end caps to prevent the ingress of moisture into the cable ends. Reels shall be shipped
upright. All shipments shall be prepaid, F.O.B. Lodi, California.
16.0 MATERIAL SAFETY DATA SHEETS
Material Safety Data Sheets, for specific cable components which are considered
hazardous, shall accompany each order. Three (3) copies shall be supplied at time of
delivery.
17.0 MANUFACTURER'S CERTIFICATION
The Bidder/Supplier must provide manufacturer's certification indicating:
1. The cable meets the specifications.
2. The cable is of recent manufacture (less than 3 months).
15kv_spec.doc Page 4 of 4 Spec.# C -HV -10
Date: September 2002