IEEE 1844-2015 pdf free.IEEE Standard Test Procedure for Determining Circuit Integrity Performance of Fire Resistive Cables in Nuclear Facilities.
The thermocouple junction shall be located not less than 150mm (6.0 in) from the exposed surface of the cable test assembly.
The thermocouples being enclosed in protection tubes of such materials and dimensions that the time constant of the protected thermocouple assembly lies within the range from 5.0 mm to 7.2 mm.
NOTE—A typical thermocouple assembly complying with this time constant requirement is fabricated by fusion-welding ihc twisted cnds of No. 18 AWG (0.82 mm2) Chromel-Alumel wires, mounting the leads in porcelain insubtors and inserting the assembly into a standard weight 0.50 in. (13 mm) black wrought iron, black wrought steel or Inconel pipe, and sealing the end of the pipe that is inside the furnace, The thermocouple junction is to be insidc the pipe. 0.50 in. (13 mm) from the sealed end, Ills not prohibited to use other types of protecting tubes or pyrometers hat. under test conditions. give the same indications as the above standard within the limit of accuracy that applies for furnace-temperature measurenwnts.
The exposed length of the pyrometer tube and thermocouple in the furnace chamber shall be not less than 305mm (12.0 in),
The temperatures shall be read at intervals not exceeding 5 mm.
The accuracy of the furnace control shall be such that the area under the time-temperature curve, obtained by averaging the results from the pyrometer readings. is within l0°/o of the corresponding area under the standard time-temperature curve shown in Figure 1 for tire tests of one (1) hour or less duration, within 7.5% for those over one (I) hour and not more than two (2) hours, and within 5.0% for tests exceeding two (2) hours in duration.
3.4 Cable functionality circuit
3.4.1 Power cable
The following requirements shall apply when testing power cable:
— Power cable shall be tested at the utilization voltage. When utilization voltage is not provided, the power cable shall be tested at rated voltage. The test voltage applied shall be in ac volts, measured in tins. If a voltage other than the rated voltage of the cable is used, then any rating assigned to the cable test assembly shall be limited to the tested voltage.
— The power supply shall be a solidly grounded, three-phase. wye-connected source. The power supply shall be ofsullicient capacity to maintain the initially applied voltage at any current up to and including any overload current permitted by the safety device.
— Each insulated conductor shall be connected to a phase leg of the supply (LI, L2, or L3). For cables with greater than three insulated conductors, only three conductors need to be connected to the supply. All other conductors shall be connected to ground. Figure 2 shows a generic illustrative example of the circuit functionality circuit for use with power cable.IEEE 1844 pdf download.