HomeMy WebLinkAboutAgenda Report - May 7, 1997 (99)a
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R..C:iT: d � = CITY OF LODI COUNCIL COMMUNICATION
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AGENDA TITLE: Specifications and Advertisement for Bids for Underground
Primary Electrical Cable
MEETING DATE: May 7, 1997
PREPARED BY: Electric Utility Director
RECOMMENDED ACTION: That the City Council approve the specifications and authorize
advertisement for bids for 20,000 feet of #2AWG jacketed, 17,500
feet of #2/0 jacketed, and 2,500 feet of #2/0 unjacketed 15KV
concentric neutral underground primary conductor for the Electric
Utility Department.
BACKGROUND INFORMATION: This cable will be needed for installation in new residential and
commercial subdivisions scheduled during the next twelve months,
and to provide an inventory for routine or emergency maintenance
of the existing electrical system.
Some of the developments requiring cable are Bridgetown Unit 1, Sunwest Unit 14, Century Meadows
1 Unit 2, Century Meadows 3 Units 4 and 5, and Towne Ranch 6.
FUNDING: Electric Utility Department Operating Fund
Estimated Cost: $47,000
Alan N. Vallow, Electric Utility Director
Prepared by Joel Harris, Purchasing Officer
cc: Director, Engineering and Operations
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APPROVED:
H. Dixon Flynn -- City Manager
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CITY OF LODI
EQUIPMENT SPECIFICATIONS
15 -KV, XLPE INSULATED, JACKETED AND NON-JACKETED, CONCENTRIC NEUTRAL CABLE
1.0 GENERAL
Cable furnished under these specifications shall be limited to cross-linked thermosetting
polyethylene (XLPE) insulated concentric neutral cable rated 15,000 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°C. Cables 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 CABLE
A. Conductor
Insulated conductor shall be aluminum alloy, EC Grade, Class B, stranded or compressed
strand, three-quarter or half hard.
B. Conductor Shield
The conductor (strand) shielding shall be extruded and shall consist of virgin black semi-
conducting cross-linked, thermosetting polyethylene. The extruded shield shall have an
average thickness of not less than 15 mils when measured over the top of the strands and a
minimum thickness of not less than 12 mils. The outer surface of the conductor shield shall
be cylindrical and shall be firmly bonded to the overlaying insulation.
C. Insulation
Insulation shall be unfilled, semi -transparent, 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.
D. Insulation Shield
The insulation shielding shall be extruded and shall consist of one layer of virgin black semi-
conducting, cross-linked thermosetting polyethylene, compatible with and extruded over the
insulation. It shall maintain its shielding properties after exposure to normal operating
temperatures and environs. The insulation shield compound and thickness shall be in
accordance with AEIC Standard.
E. Construction Method
Conductor shield, insulation and insulation shield shall be installed on the conductor using
the triple extruding, dry cure method.
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F. Concentric Neutral
The concentric conductor shall be composed of a number of round annealed bare (uncoated)
copper wires helically wrapped around the cable. The number and size of the neutral wires
shall be as specified in Table I. The length of lay shall not be less than 6 nor more than 10
times the diameter over the concentric wires.
G. Overall Jacket (if required on Proposal Form
An extruded, encapsulating and insulating layer of linear, low density black polyethylene,
(Union Carbide DFDB 6425, British Petroleum SP D 995, or approved equivalent) shall be
applied over the concentric neutral wires in accordance with ICEA S-66-524, Part 4.3, except
where modified by this Specification. The minimum thicknesses of this encapsulating jacket
over the concentric wires shall be as follows:
Conductor Size (AWG or KCM) Minimum Thickness (Mils)
#2 50
#2/0 80
750 & 1,000 110
H. Marking
Footage markings shall be imprinted on the jacket of the cable in two -foot imcrements.
Beginning and ending footage numbers shall be indicated on a durable label securely
attached to a flange of the reel.
I. Testing and Guarantee
Testing of cable shall be performed according to procedures set forth by the 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.
J. Specific Requirements
Any conditional bids such as "subject to availability in stock" will be rejected. Cable shall be
furnished according to Table I below:
TABLE I
Conductor Size Conc. Neutral NEMA
AWG or KCM Size - AWG Material Insulation Reel Code
(No. of Strands) (Min. No. of Wires) Phase (Neut.) Thick. (Mils) Number
#2 (7)
#14 (10)
Alum. (Cu)
220
5832
#2/0 (19)
#14 (9)/#12 (6)
Alum. (Cu)
220
5832
750 (61)
#12 (24)/#10 (15)
Alum. (Cu)
220
7848
1,000 (61)
#10 (20)
Alum. (Cu)
220
7848
NOTE: Refer to
proposal forms for specific sizes, quantities and jacketing requirements.
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K. Reels
1. Makeup and Length:
Reels are to be shipped full to their maximum capacities.
2. Packaging:
Each cable reel shall have adequate protective covering across the flanges. Such
covering shall 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.
EXCEPTION: Reels containing #2 or #210 AWG conductor shall be paper
wrapped only: no lagging is required.
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, shipping length
of cable on reel, weight of reel (tare weight), total weight of cable on reel, type and size
of conductor, insulation type and thickness, voltage rating and manufacturer's
identification number.
L. Shippinq
Cable ends shall be adequately sealed with a water seal -type material and plastic end caps
secured by tape to prevent penetration of moisture. There shall be no water in the stranded
conductor of the cable when the reel is shipped. Reels shall be shipped upright. All
shipments shall be prepaid, F.O.B. Lodi, California.
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