electrical installation. Copper-clad steel rods
will be specified for normal conditions.
Zinc-coated steel or stainless steel rods will be
used where low soil resistivities are encountered
and galvanic corrosion may occur between adjacent
underground metallic masses and the copper-clad
rods. Stainless steel rods have a longer life than
the zinc coated steel, but their use must be
justified due to higher cost. Rods 16 mm (5/8 inch)
in diameter and 2.4 meters (8 feet) in length are
generally acceptable; however, in rocky soils 19 mm
(3/4 inch) rods must be specified. In high
resistivity soils, 3 meter (10 foot) or sectional
rods should be used to obtain the required
resistance to ground. Where rock is encountered,
additional rods, a counterpoise, or ground grid may
be necessary. Coordinate and standardize rod
selection for individual facilities with other
specification sections.
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Ground rods shall be of [copper-clad steel conforming to UL 467]
[zinc-coated steel conforming to ANSI C135.30] [solid stainless steel not
less than [16] [20] mm [5/8] [3/4] inch in diameter by [2] [2.5] m [8] [10]
feet in length] [of the sectional type].
2.7.3
Wiring
Wiring for 120 Vac power shall be No. 12 AWG minimum. Wiring for low
voltage dc circuits shall be No. [16] [14] AWG minimum. Power wiring (over
28 volts) and control wiring shall be isolated. All wiring shall conform
to NFPA 70. System field wiring shall be solid copper and installed in
metallic conduit or electrical metallic tubing. Conductors shall be color
coded. Conductors used for the same functions shall be similarly color
coded. Wiring code color shall remain uniform throughout the circuit.
2.7.4
Special Tools and Spare Parts
Special tools necessary for the maintenance of the equipment shall be
furnished. One spare set of fuses of each type and size required and five
spare lamps of each type shall be furnished for each transmitter location
and for the receiver location. Spare fuses and lamps shall be mounted in
the equipment cabinets at each location.
2.7.5
DACT Programmer
A programming device shall be provided for programming the required
information in each DACT, if programming capability is not an integral part
of the DACT. Required programming equipment, including the programmer,
interconnect cables and adaptors, and power supply shall be provided.
[Six] [_____] spare program chips shall be provided if removable program
chips are used.
PART 3
EXECUTION
3.1
INSTALLATION
Work shall be installed as shown and in accordance with the manufacturer's
recommendations. Necessary interconnections, services, and adjustments
SECTION 13853A
Page 15
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