UL 62:2006 pdf download – Flexible Cords and Cables.
5.2.3 Insulation resistance
5.2.3.1 Insulaffon resstance for all W Type cords at 15°C
The Insulation resstance of the insulated conductors shall be not less than shown In Table 47 or 48 when a specimen of at least 15 m (50 ft) of the finished cord is tested in water at 15 °C immediately following the dielectric strength test described in Clause 5.2.2. If tested at temperatures different than 15 °C. the values shall be corrected to 15 °C.
5.2.3.2 Insulation resstance for all indoor cords at room temperature
The insulation resistance of the insulated conductors shall be not less than 0.76 Gçl•m (2.5 Mc•1000 It) at 15 °C when a specimen of the finished cord at least 15 m (50 ft) in length is tested in air at 15 °C or higher after conditioning for at least 6 h and immediately following the dielectric strength test described In Clause 5.2.2.
5.2.3.3 Test method
Compliance witti all insulation resistance tests shall be determined in accordance with the method described in CSA C22.2 No. 0.3, Clause 4.28.2.1 and Table 15; UL 1581, Section 920; or NMX-J-294-ANCE.
5.2.4 Permitlivity and stability factor
52.4.1 Permittivity —‘W Type cords
5.2.4.1.1 When tested in accordance with CSA C22.2 No, 0.3, Clause 4,28.4; UL 1581, Section 1020; or NMX-J-040ANCE, the permittivity of the insulation shall be as follows:
(a) after 14 d of immersion the capacitance shall not be more than 10% greater than the capacitance measured after the first day: and
(b) after 14 d of immersion the capacitance shall not be more than 3% greater than the capacitance measured after 7 d.
5.2.4.1.2 Tests shall be made using three 5 m (16 fI) specimens of Insulated conductor. Specimens shall
(a) tested without any polyester tape or similarly non-absorptive separator; and (b) selected before assembly into finished cord.
The middle 3 m (10 It) of each specimen shall be immersed continuously in tap water in a temperature of 50 °C ± 1 °C for therrnoset insulation or 60 °C ± 1°C for thermoplastic insulations for 14 d. The 1 m (3 It) end portions of each specimen shall be kept dry above the water as leakage insulation. A cover for the tank shall be placed directly above the surface of the water. The water level shall be kept constant.
5.2.4.2 Stability factor — W’ Type Cords
5.2.4.2.1 When tested in accordance with Clause 5.2.4.2.2; UL 1581. Section 1000; or NMX,J-040.ANCE, the insulation shall meet the following requirements:
(a) the stability factor (the numencal difference between the percentage power factors measured with current at average stresses of 3150 V/mm and 1575 V/mm (80 V/mu and 40 V/mil)) after the fourteenth day of immersion shall not be greater than 1.0; or
(b) the difference between the stability factors measured after the first and fourteenth days shall not be greater than 0.5.
5.2.4.2.2 Tests shall be made using three 5 rn (16 fI) specimens of insulated conductor. Specimens shall
(a) tested without any polyester tape or similarly non-absorptive separator: and (b) selected before assembly into finished cord.
The m.ddle 3 m (10 ft) of each specimen shall be immersed continuously in tap water at a temperature of 50 DC ± 1 °C for thermoset insulations or 60 °C ± 1 DC for thermoplastic insulations for 14 d. The 1 m (3 ft) end portions of each specimen shall be kept dry above the water as leakage insulation. A cover for the tank shall be placed directly above the surface of the water. The water level shall be kept constant.
5.2.4.2.3 The percentage power factor of each specimen shall be measured with a 60 Hz current at average stresses of 3150 VImm and 1575 V/mm (80 V/mil and 40 VJmil) after 1 d and 14 d total immersion, and each result shall be expressed to the nearest 0.1. The stability factor of each specimen shall then be computed and expressed to the nearest 0.1.
5.2.4.2.4 The stability factor difference shall then be computed for each specimen. This value is the numerical difference between the stability factors measured after 1 d and 14 d and shall be expressed to the nearest O1
5.2.5 Standard arcing test for Type HPN.