HomeMy WebLinkAboutAgenda Report - April 18, 2001 E-04CITY OF LODI COUNCIL COMMUNICATION
AGENDA TITLE: Approve Specifications and Authorize Advertisement for Bids for
Underground Electrical Conductor (EUD)
MEETING DATE: April 18, 2001
PREPARED BY: Electric Utility Director
RECOMMENDED ACTION: That the City Council approve the specifications and authorize the
advertisement for bids for the following sizes and quantities of
underground electrical conductor:
25,000 feet each of #1/0 and #350 500 -volt underground triplex cable,
20,000 feet each of #2 and #750 15kv XLPE concentric neutral primary conductor, and
45,000 feet of #2/0 15kv XLPE concentric neutral primary conductor.
BACKGROUND INFORMATION: Portions of this cable are planned for installation in the following
subdivisions. 7,800 feet of #750 will be used to complete the 1230
circuit on Evergreen between Elm Street and Paradise, and on
Paradise between Evergreen and Silver Tip Way. The balance will
be placed into inventory to cover future needs.
Century Meadows #1, Unit 2, Century Meadows #4, Unit 2,
Tienda Place Units A and B,
The Parisis development in Grid 58, and
The Beck/Perlegos Development in Grid 58.
While plans for installation of this conductor are subject to the same market uncertainties as those
outlined in the Council Communication for Power Utility Duct and Fittings, wire manufacturing
parameters and delivery lead-times don't allow the same ordering flexibilities as those available with
conduit. On the other hand, storage and shelf -life concerns are less an issue with wire than with pipe,
and lower current metals prices for copper and aluminum suggest that now is a favorable time to buy
conductor.
FUNDING: Electric Utility Department's Operating Fund, Page E-25
Estimated Cost: $208,000
BID OPENING: May 4, 2000
AIII ectric Utility Director
Prepared by Joel Harris, Purchasing Officer
cc: Manager, EUD Engineering and Operations
APPRov®:
ixo Flynn — Cit Manager
15kv_& 600V Triplex_CC1.dac 04109101
City of Lodi
Equipment Specification
15 kV, TR-XLPE INSULATED, CONCENTRIC NEUTRAL CABLE
1.0 GENERAL
Cable furnished under these specifications shall be limited to 15 kV 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, ILEA,
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 B231, 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.
Page 1 of 4
TxxLPCA2.sPC.dm Spec.# C -HV -10
Date: April 2000
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.
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:
Page 2 of 4
TRXLPCA2.SPC.dm Spec.# C -HV -10
Date: April 2000
Conductor Size (AWG or kcmil) Minimum Thickness (mils)
#2 and 42/0 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).
12.0 TESTING AND GUARANTEE
Testing of cable shall be performed according to procedures set forth by ICEA, ASIC 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:
Conductor Size
AWG or kcmil
(No. of Strands)
Conc. Neutral
Size
Material
Phase (Neutral)
Insulation
Thickness (mils)
NEMA
Reel Code
#2 (7)
Full Neut.
Alum. (Cu.)
220
5832
#2/0 (19)
1/3 Neut.
Alum. (Cu.)
220
5832
750 (61)
1/3 Neut.
Alum. (Cu.)
220
7848
1000 (61)
1/3 Neut.
Alum. (Cu.)
220
7848
NOTE: Refer to proposal forms (bid sheets) for specific sizes and quantities.
Page 3 of 4
TRXLPCA2.SPC.doe Spec.# C -HV -10
Date: April 2000
14.0 REELS
Makeup and length:
Reels shall be shipped with cable to their full maximum cable capacity.
2. 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.
Markinaa:
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.
is 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).
Page 4 of 4
TRXLPCA2.SPC.doc Spec.# C -HV -10
Date: April 2000
City of Lodi
Equipment Specifications
600 -VOLT XLPE TRIPLEX CABLE
1.0 GENERAL
Cable furnished under these specifications shall be limited to cross-linked polyethylene insulated
cable rated 600 volts and suitable for installation in ducts or for direct burial in earth, in wet or
dry locations, with normal conductor temperatures up to 90 degrees C. Cables furnished shall
meet the requirements of the applicable NEMA, ICER, ASIC, and ASTM standards, latest
edition thereof, unless otherwise noted in this specification.
2.0 CONDUCTOR
The conductor shall be aluminum alloy, EC Grade, '/2 to 3/4 hard, Class B stranding.
3.0 INSULATION
Phase conductor insulation shall be single -pass, black, cross-linked polyethylene. The neutral
conductor shall have yellow XLPE insulation or black XLPE insulation with yellow extruded
stripes.
4.0 ASSEMBLY
The assembled cable shall consist of phase and neutral conductors twisted together with a lay not
less than 50 nor more than 60 times the outside diameter of one of the phase conductors. All
cable ends shall be sealed to prevent the entrance of moisture.
5.0 IDENTIFICATION
Each conductor shall have a permanent marking showing the manufacturer's name, voltage
rating, conductor size and type of insulation. Additionally, one leg of the triplex shall be marked
with sequential footage marks at least every two feet.
6.0 TESTING AND GUARANTEE
Testing of cable shall be performed according to procedures set forth by the ICEA, AEIC and
ASTM. Certified copies of Pass/Fail test results shall be supplied to the City at the time of
shipment. Any cable found defective either upon inspection, testing or installation will be
returned at the manufacturer's expense.
7.0 SPECIFIC REQUIREMENTS
Any conditional bids such as "Subject to Availability in Stock" will be rejected as non-
responsive.
8.0 SHIPPING
Cable ends shall be adequately sealed with a water -seal type material and plastic end caps
secured to prevent the penetration of moisture. There shall be no water in the stranded conductor
of the cable when reel is shipped. All shipments shall be prepaid, FOB delivered to the City of
Lodi, Lodi, CA. Reels shall be shipped upright.
4.1 Rev. 4/10190
9.0 REELS
9.1 MAKEUP
The specified conductor shall be supplied on NEMA standard reels and in accordance with
Table I as shown below.
TABLE l
CONDUCTOR SIZE
PHASE NEUTRAL
CODE WORD
MATERIAL
NEMA STANDARD
REEL CODE NO.
#2 #2 AWG
Ramapo / YES
Aluminum
3624
#1/0 (#1/0) AWG
Bergen / YES
Aluminum
3624
350kcmil (#4/0)
Wesleyan / YES
Aluminum
5432 or 7236
9.2 PACKAGING
Each reel shall have adequate protective covering across the flanges, such covering to consist
of wood members from flange to flange covering the entire circumference of the reel
(lagging). The lagging shall be nailed to the flange perimeters and shall be further secured
with at least two steel bands around the reel. Each end of the cable shall be firmly secured to
the reel.
9.3 MARKING
Each reel shall be marked with a durable label securely attached to a flange of the reel and
plainly marked stating the destination, the purchaser's order number, the shipping length of
cable on reel, type and size of conductors, insulation type and thickness, voltage rating and
manufacturer's identification number, and tare weight of the reel.
4.2 Rev. 4/10/90