valve box capable of withstanding [H-20] [_____] traffic loads.]
2.2.7
Cast-In-Place Concrete
Flush mount type test stations, bonding boxes, and anode junction boxes
shall be centered in a 460 x 460 x 102 mm 18 x 18 x 4 inch concrete slab.
Concrete shall be 20 Mpa 3000 psi minimum ultimate 28-day compressive
strength with 25 mm one inch minimum aggregate conforming to [ASTM C 94]
[Section 03300N CAST-IN-PLACE CONCRETE].
2.3
PERMANENT REFERENCE ELECTRODES
Permanent reference electrodes shall be [copper copper-sulfate] [silver
silver-chloride] [zinc] specifically manufactured for [underground]
[marine] use, [32] [_____] mm [1 1/4] [_____] inch diameter, by [255]
[_____] mm [10] [_____] inches long, [plastic [_____] tube with an ion trap
to minimize contamination of the cell] [, and a minimum surface sensing
area of [____] square centimeters[______] square inches]. [The cell shall
be prepackaged by the manufacturer with a backfill material as recommended
by the manufacturer.] Provide cells with No. [10] [12] [_____] AWG, [RHW]
[THHN] [____] cable of sufficient length to extend to the [test station]
[junction box] without splicing. Reference electrodes shall have a minimum
15 year life, stability of plus or minus 5 millivolts under 3 microamp
load, and an initial accuracy of plus or minus 10 millivolts referenced to
a calibrated portable reference electrode.
2.4
CABLE AND WIRE OTHER THAN ANODE LEAD WIRES
[UL 83, Type [TW] [THWN] [THHN]] [ASTM D 1248, Type HMWPE (High Molecular
Weight Polyethylene)], [UL 44, Type RHW], [solid] [stranded] copper
conductor, color coded and sized (based on AWG). Copper wires shall
conform to ASTM B 3 and ASTM B 8. Lead wires terminating at a junction box
or test station shall have a cable identification tag. [Do not use bare
copper wire for joint continuity bonds.] Refer to paragraph 2.1.4 [_____]
for anode lead wires.
2.5
CABLE AND WIRE IDENTIFICATION TAGS
[Laminated plastic material with black letters on a yellow background]
[[Brass] [Stainless steel] material with engraved letters]. Print letters
and numbers a minimum of 5 mm 3/16 inch in size. Provide identifier legend
[in accordance with the drawings] [_____].
2.6
WIRE CONNECTORS
UL 486A-486B.
[_____] [Solderless copper lugs]
2.7
UNDERGROUND SPLICES
Provide splices with a compression connector on the conductors, and
insulation and waterproofing using one of the following methods which are
suitable for continuous submersion in water and comply with ANSI C119.1.
a.
Provide cast-type splice insulation by means of molded casting
process employing a thermosetting epoxy resin insulating material
applied by a gravity poured method or pressure injected method.
Provide component materials of the resin insulation in a packaged
form ready for convenient mixing without removing from the package.
SECTION 13110N
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