HomeMy WebLinkAboutAgenda Report - May 7, 2003 E-04CITY OF LORI
AGENDA TITLE: : Approve specifications and authorize advertisement for bids for
various sizes and lengths of 1 kV underground cable ( UD)
MEETING DATE: May 7, 2003
PREPARED BY: Electric Utility Director
RECOMMENDED ACTI N; That the City Council approve the specifications and authorize the
advertisement for bids for sizes and lengths of medium -voltage
concentric neutral underground electrical cable, as described
below.
BACKGROUND INFORMATION: This request for bids is intended to serve two purposes.. First,
electrical cable is needed for later phases of service installation in
new subdivisions this year. Second, electric utility department staff
believe opportunities exist with a new type of cable insulation, ethylene -propylene rubber (EPR), which
has a longer life and, while Tightly more expensive, is expected to yield efficiencies in installation and a
lover overall cost of ownership. An evaluation using actual bid data will be helpful in determining
ining
whether a charge to EPR is warranted at this time.
Staff is recommending mending that bids be obtained for both crosslinked polyethylene J -XLP)-insulated cable,
and for -insulated cable, After evaluation, a recommendation will be made to Council for award.
The fallowing sees and lengths of cable are included in this bid:
44 6 cr �6 ft r ra d
3
HOCA kcmil, Per P .& pec
.._ ..
_
7 ( gHJ2,a0. per regi
f
/v fss tt �a.
z�
ro Adv
10�
AWG ( QC per reel
21'000 €t
#1t€ w (rep c 2 €�d t# 1{3
4 t3oQ ftp
The items marred with an asterisk will be needed for subdivisions. The other items are included for
evaluation purposes only, and will not be recommended for award.
UNDiN : Electric Utility Department Line Extensions
20.01-2003 Financial Plan and Bridget, Page -29
Estimated cost $141,00Q
r t.
1.0 GENERAL
Cable furnished under these specifications shald to 15 W single conductor
URD oable, stranded aluminum conductor, filled str:
conductor, triple extruded insulating system
consisting of a semi -conducting shield, insulation,semi-conducting insulation
encapsulatingshield, bare copper concentric neutral and jacket. The cable
designed for installation in conduits or for direct burial in .: d_
y locations as
well as outdoor locations exposed IF weather and sunlight. Cable furnished shall meet
the requirernents of the applicable NEMA, ICEA, AEIC and ASTM Standards,
operationedition thereof, unless otherwise noted in this specification. The insulation shall be tree -
retardant crosslinked polyethylene (TR-XLP) suitable for operation at 90 degree C
continuous and 130 degree C emergency or ethylene- propylene rubber (EPR) suitable
for 140 degree C emergency, as specified.
compressed2,0 CONDUCTOR
The insulated conductor shall be Class B, stranded or 0
aluminum alloy, three-quarter hard meeting the requirements of ASTM B231IB231M,
8609/6609M. Conductor size will be listed on the proposal forms (bid sheets).
3.0 STRANDFILLING 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 rasing standard compression -type
connectors and utilizing the same techniques as for unfilled conductors.
.0 CONDUCTOR SHIELD
The conductor (strand) shielding shall meet the requirements of ABC CS8. The
material shall be compatible with the conductor metal and free stripping from the
stranded conductor. The outer surface of the conductor shield shall be cylindrical and
shall be firmly bonded to the overlaying insulation.
5.0 INSULATION
The insulation thickness shall be nominal 220 mils (133%) and meet the requirements of
1A -9-649
A,
TIS -CLP insulation shall be unfilled, semi -transparent, tree -retardant, cross-linked
thermosetting etting polyethylene extruded directly over the conductor shield. The insulation
compound shall meet AEIC CS8 part D,1
EPR insulation shall be a red colored flexible thermosetting dielectric based on an
ethylene propylene elastomer. The ethylene content of the elastomer used in the
insulation compound shall not exceed 72% by weight nor shall the insulation compound
contain any polyethylene.
1 Of 5 EPR XLP 15 W spec 2003Am
6,0 INSULATION SHIELD
The insulation shielding shall be an extruded semi -conducting material compatible with
the insulation and the overlying metallic shield.. The insulation shield compound and
thickness shall be in conformance with ILEA -94-649
No clearing shall be required upon stripping the mi -conducting layer if splicing or
terminating immediately follows the stripping process.
insulation7,0 CONSTRUCTION METHOD
Conductor shield, Insulation and l be installed on the conductor
methodusing the "True -Triple" extruding, dry cure for TR-XLP and using the: triple
coppertandem extrusion method for EPR,
8.0 CONCENTRtC NEUTRAL
The concentric neutral conductor shall be a number of round, annealed, bare
wires helically wrapped around the cable. The wires shall ib spaced equidistant
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 neu tral wires shall be in the range of #14
NEUTRAL"The number of neutral wires shall be sufficient to yield "FULL
NEUTRAU as specified on the proposal sheet, except for the I 100 kcmil, 25 W cable
per PG&E specifications.
9.0 ENP LIL TIN JACKET
An extruded insulating layer of thermoplastic material shall be applied over the
concentric. neutral wires in accordance with lE -94-649. The jacket shall b
compatible with the overall cable system.
The jacket shall encapsulate all neutral wires.
10.0 MARKINGS
The encapsulating jacket shall be marked by means of surface or indent print with the
following information at regular intervals with no more than 6 inches of unmarked space
between cable identification, with the following 'information:
1. Manufacturer's identification or trade name.
Size of conductor
Conductor material,
4. Type of insulation,
Voltage rating,
6. Nominal insulation thickness
7, Year of manufacture.
National Electric Safety Cade "LightningBolt' symbol.
9. 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),
2 of 5 EPR XLP 15 W spec 2003.dar
I 1.0 TESTING AND GUARANTEE
Testing of. cable shall be performed according to procedures set forth by ILEA, ASIC
-
an ASTMStandards. Certifl d copies of pass/fail test results shall b sup plied,
Any cable found defective either upon inspection, testing or installation will be returned
t the manufacturers rs expense.
12.0 SPECIFIC REQUIREMENTS
Any conditional bid such as "subject to availability in stock" will be considered nor
responsive and will be rejected. Cable shall be furnished according to Table 1 anal/car
below:
EConductor Size ' Cone. Neutral
AWG or kcmil Ii(Neutral)Thickness
Material Phase
Insulation
(mll )
,eel Dimensions
i o. of Strands)
Nominal
(Dia. Tr v. Drum)
#2 (7). Full Aleut.
Alt. (u,)
220
58-3-2
_#/0 (1) _ 1/3 Nut.
Alum. (Cu.)
20
53-3-23
750 (61) 1/3 Nett.
Alum. (Cu.)
220
73-4$-4_2
1000 (61) 11 Neut.
Aft t. (cu.)
220
78-48-42
-I -- 7—
Conductor Size 1
Cone. NeutralInsulation
AWG or kcmil Size(Neutral)Thickness
Material Phase
(rails)
Reel Dimensions
(Dia. Tray. Drum)
e . of strands .
Nominal
� _
#1f0( ) Full Nut.
Alum. (Cu.)
220
58-32-28
#410 (19) 1/3 Neut.
, Alum, (Cu.)
220
58-32-28
750 (61) -ry 113 Nut,
Alum. (u.)
22073-4-4
1100(61)' 1 ± Neut.�
Alum, (Cu.)
260
78-48-42
* Per Specification for 1100 kcrnil 25 W cable (Okonate ref, FSC #160-23-9763)
�.: I :..:6.
3 of 5 EPR XLP 15 W spec 200$.doc
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Beels
Shall be "Heavy Duty Reuseable Wood Reels - Class 2" meeting NEM
Standards Publication No, WC 26-2000 and EEMAC Standards Publication . 20
2000, or latest revision thereof, See Table 3 belowI
Table 3
Heavy Duty Reuseable Wood Reels — Class 2
ffm
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".
bTapered cable test holes are required.
C. Headed nails are to be used, spaced 3 inches apart with a minimum
countersink of 1116" 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.
2, Mak
Reels shal(be shipped with cable to their full maximum cable capacity.
#2, #11/01 #210 and #4/0 AWG shall be shipped on 58-32-38 reels,
750, 1000, 1100 kcmil shall be shipped on 78-48-42 reels.
Alternate reel sizes may be considered. However, a proposal with reels
exceeding the maximum flange diameters of 78" or 58" and traverse width of 48"
and 32", respectively, will be considered non responsive and will be rejected.
I Packaging.
Reels containing 750, 1000 and 1100 kcmil Gable 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, #1/0, #2/0 and #4/0 AWG cable shall be paper wrapped
only, Le, lagging is not required.
Each end of the cable shall be firmly secured to the reel.
4 of 5 EPR XLP 15 k\/ spec 200.3-doc
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Each reel shall be marked with two durable labels securely attached. to each
flange of the reel and plainly marked and stating.
a, Destination.
lb. Purchaser's purchase order number.
c. Shipping length of cable on reel.
d. Weight of reel (tore 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.B eginning and ending footage numbers of cable on the reel,
14.0 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, F0& Lodi, California.
15.0 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,
16.0 MANUFACTURER'S CERTIFICATION
The Bidder/Supplier must provide manufacturer's certification indicating:
1. The cable meets the specifications.
1 The cable is of recent manufacture (less than 3 months).
17,0 EPR CABLE REQUIREMENTS
The successful bidder for EPR cable shall provide, meet and show proof of the
following with the proposal:
1. Reference a minimum of five United States electric utilities with at least 100,000 feet
of cable with the exact same insulating material in service for a minimum of 20
years, Include contact persons and phone numbers.
2, The successful cable manufacturer shall have a minimum of 25 years proven and
successful experience with the manufacture of EPR insulated cable.
3. The EPR cable shall ca" a forty -year warranty, by the manufacturer, after receipt
in Lodi.
5 Of 5 EPR nP 15 IN sper 2003.doc