IEEE Std 1844-2015 pdf download – IEEE Standard Test Procedure for Determining Circuit Integrity Performance of Fire Resistive Cables in Nuclear Facilities.
1. Overview 1.1 Scope This standard provides a method for subjecting energized cable systems to a standard fre exposure to obtain a time rating. Types of cable include power, control, instrumentation and communication cables. Acceptance criteria are based on the cable maintaining functionality throughout the prescribed test. 1.2 Purpose The purpose of this standard is to establish criteria to determine the circuit integrity performance of fre resis- tive cable systems. 1.3 Applications This standard applies to multi-conductor cables and single insulated conductors that are allowed to be installed in cable tray, conduit, free air, or to other cable and conductors for which passing circuit integrity test condi- tions to the requirements of this standard is desired. Cable test assemblies that pass this standard are intended to represent “fre-rated cables” for protection of nuclear facility safe-shutdown systems or components from the effects of fre. Use of these cables in a regulatory application may require the review and approval by the authority having jurisdiction.
2. Defnitions For the purposes of this document, the following terms and defnitions apply. The IEEE Standards Dictionary Online should be consulted for terms not defned in this clause. 1 American wire gauge (AWG): Designation for conductor sizes used primarily in North America. The AWG number is inversely proportional to the cross sectional area of the conductor. circular mil (cmil): The area of a circle whose diameter is one mil (one mil is one-thousandth of an inch). One cmil = 7.854 × 10 – 7 in 2 (5.067 × 10 – 4 mm 2 ) communication cable: A cable that carries low level electric energy used for the transmission of communica- tion frequencies. A communication cable consists of two or more insulated conductors with either shielded or unshielded sheath. Examples include CAT cable, profbus, data net, telephone, feldbus, modbus etc. control cable: Cable used in a control function application, e.g., interconnection of control switches, indi- cating lights, relays, solenoids, etc. Generally the cable construction is 600 V or 1000 V, single or multiple conductors, typically in wire sizes 8 to 14 AWG. fre resistive cable: An electrical cable that complied with the requirements of this standard for the type of cable to be tested and that meets the cable functionality requirements described herein. fre-resistance rating: The measured time, in hours or fractions thereof, that the system will withstand fre exposure as determined by fre tests conducted in conformity to recognize standards.