IEEE Std 515-2017 pdf free download – IEEE Standard for the Testing, Design, Installation, and Maintenance of Electrical Resistance Trace Heating for Industrial Applications.
The test voltage, where E is the rated voltage, shall be applied between the conductors and the electrically conductive covering at a rate of rise neither less than 100 V/s nor more than 200 V/s and maintained for 60 0 5 − + s without dielectric breakdown. The test voltage waveform shall be essentially sinusoidal, with a frequency of 45 Hz to 65 Hz. Alternatively, the dielectric test may be conducted by submerging the trace heater in tap water at room temperature (resistivity typically 500 Ω·m). The electrically conductive covering shall be bonded to the water and the voltage shall be applied between conductors and the water. For type tests 4.1.3, 4.1.5, and 4.1.7 through 4.1.9, and the routine test in 4.3.2 for MI trace heaters the required test voltage is reduced to 2 500 × + E V ac for trace heaters rated over 30 V ac, or to 2 500 × + E V dc for trace heaters rated over 60 V dc in type tests, due to the dielectric characteristics of the MI trace heater construction and electrical insulation materials.
4.1.2 Electrical insulation resistance test The electrical insulation resistance test shall be conducted after the dielectric test specifed in 4.1.1 on the same test sample(s). The resistance of the electrical insulation shall be measured between conductors and the electrically conductive covering, by means of a source voltage of 500 V dc. The measured value shall not be less than 50 MΩ. Alternatively the insulation resistance test may be conducted by submerging the trace heater in tap water at room temperature (resistivity typically 500 Ω·m). The electrically conductive covering shall be bonded to the water and the voltage shall be applied between the conductors and the water.
4.1.3 Water resistance test A sample as described in 4.1, excluding integral components shall be immersed in tap water for a period of 14 d. Trace heater ends are not immersed. Within 1 h after conditioning as above, and while still immersed in the water, the sample shall be subjected to the dielectric test outlined in 4.1.1 and the insulation resistance test outlined in 4.1.2.
4.1.4 Integral components resistance to water test A sample of the trace heater with all integral components shall be placed in a tap water fow and drain apparatus as shown in Figure 1. For surface heaters, a unit with cold leads shall be used. Water fow shall be initiated and the sample shall be completely immersed. At that point, the water fow is stopped and the trace heater is energized. The apparatus is then drained. The total time from the initiation of water fow to the completion of draining shall be no greater than 4.5 min and no less than 2.5 min. The trace heater shall continue to be energized for at least 30 s after the water has been drained. The trace heater is then de-energized and water fow is initiated for the next cycle. The test shall be continued for a period of 24 h. After completion, the dielectric test outlined in 4.1.1 and the insulation resistance test outlined in 4.1.2 shall be performed. The immersed connections of the trace heater shall be inspected to verify no evidence of water ingress.IEEE Std 515 pdf download.