ANSI ICEA S 105-692-2004 pdf download STANDARD FOR 600 VOLT SINGLE LAYER THERMOSET INSULATED UTILITY UNDERGROUND DISTRIBUTION CABLES
1.1 SCOPE
This standard applies to the materials, constructions, and testing of single conductor cables and assemblies of completed single conductor thermoset insulated cables, with an insulated or bare copper or an insulated aluminum neutral, used for the distribution of electrical energy at phase-to- phase voltages not exceeding 600 volts, or phase-to-ground voltage not exceeding 480 volts, 60 Hz, and at conductor temperatures not exceeding 90 “C for use in direct burial and underground ducts.
1.2 CONSTRUCTIONS
Single conductor cables and assemblies of single conductor cables shall use conductors not smaller than 8 AWG and not larger than 1 000 kcmil. The conductors of a duplex assembly shall be of the same size. When allowed, the neutral in an assembly of three cables for use in single-phase 3-wire circuits, or the neutral in an assembly of four cables, may be reduced but shall not be less than 50% of the cross-sectional area of one phase conductor. The neutral shall be insulated if the conductor is aluminum and may be bare or insulated if the conductor is copper.
1.3 DESIGN OPTIONS
The user of this standard should recognize that it covers many options. The user should select the necessary options required for a complete description of the desired cable.
1.3.1 Conductors
Metal -Aluminum 1350, AA-8000 Series alloy, or copper.
Size – 8 AWG to 1000 kcmil, aluminum or copper.
Conductor Stranding – See Part 2.
1.3.2 Insulation
90 “C Rated – See Part 3.1
1.3.3 Neutral
Insulated aluminum, bare copper, insulated copper
1.3.4 Assembly
See Part 4.1 – Twisted or parallel – Two or more insulated conductors without an overall covering
1.4 OPERATING CONDITIONS
The design and construction of the cable shall be such that the cable will operate satisfactorily under maximum conductor temperatures as follows:
Exception: When adequate knowledge of the thermal characteristics of a cable environment is lacking, the permissible conductor temperature should be reduced by 1 0 “C or in accordance with available data.
1.4.1 The 90 “C “Normal Service” temperature is the highest allowable temperature that may be attained by the hottest portion of a cable line during daily operating load cycles. It may be used in am pacity calculations where adequate information is known about the overall thermal characteristics of the environment to assure that the normal service temperature will not be exceeded.
1 .4.2 The 1 30 “C “Emergency Overload” temperature is the highest allowable temperature that may be attained by the hottest portion of a cable line during an emergency. Operation at that overload temperature shall not exceed 100 hours in any twelve consecutive months or 500 hours during the lifetime of the cable.
1.4.3 The 250 “C “Short Circuit” temperature is the highest allowable temperature that may be attained by an insulated conductor along any part of a cable line during a short circuit of a specified magnitude and number of cycles. (See ICEA Publication P-32-382)
1.4.4 The “Rated Voltage” for the purpose of this standard is 600 volts phase-to-phase.