HomeMy WebLinkAboutAgenda Report - January 21, 1998 E-06AGENDA TITLE: Specifications and Advertisement for Bids for 20,000 feet of
#2/0 151kV Underground Cable
MEETING DATE: January 21, 1998
PREPARED BY: Electric Utility Director
RECOMMENDED ACTION: That the City Council approve the specifications and authorize
advertisement for bids for 20,000 feet of #2/0 jacketed 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 Sunwest #14, Mills Bridge, Century Meadows, Towne
Ranch, and Lodi West.
FUNDING: Electric Utility Department Operating Fund, Page E-22.
Estimated Cost: $25,000
BID OPENING: February 11, 1998
Alan N. Vallow, Electric Ute i y erector
Prepared by Joel Harris, Purchasing Officer
cc: Director, Engineering and Operations
APPROVED:
Dixon Flynn -- City Manager
CCI .DOC 01/13/98
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 longitudinally water blocking under the 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, ICER, 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.
Spec.# C -HV -10
Date: Jan. 1998
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 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 LONGITUDINAL WATER BARRIER
A longitudinal water barrier shall be applied over and around the neutral wires. This
barrier shall, when activated by the presence of water, prohibit the longitudinal movement
of water at the neutral wire/jacket/insulation shield interface.
11.0 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.
Spec.# C -HV -10
2 Date: Jan. 1998
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 92/0 50
750 and 1000 80
12.0 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).
13.0 TESTING AND GUARANTEE
Testing of cable shall be performed according to procedures set forth by ICER, 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.
14.0 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 1/3 Neut.
Alum. (Cu.)
1 220
1 7848
NOTE: Refer to proposal forms (bid sheets) for specific sizes and quantities.
Spec,# C -HV -10
Date: Jan. 1998
15.0 REELS
Makeup and length:
Reels shall be shipped with cable to their full maximum cable capacity.
2. Packagina:
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 42 and 92/0 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.
Marking:
Each reel shall be marked with a durable label securely attached to the flange of
the reel and plainly 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.
16.0 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.
17.0 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.
LADATA1WP601TRXL.PCAI.SPC Spec* C -HV -10
4 Date: Jan. 1998