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Dielectric Withstand Voltage

Electrical FOR: Insulation $2,250

The dielectric withstand voltage (DWV), sometimes referred to as the “Voltage Proof Test” or “Wet Dielectric Test”, is perhaps one of the most referenced tests when examining wires. The reason is that the test performs the most important part in wire insulation assessment: it determines if the wire insulation is free of breaches (or has been sufficiently degraded such that a high voltage would breach any insulation weak points). The basic concept of the DWV test is that the entire wire, except for two inches at both ends, is placed in a water bath and a high voltage potential is placed between the conductor and the return electrode in the water bath. If there is a failure in the insulation, then there will be a noticeable current flow.

The following parameters can be modified for this test for an additional fee:

Procedure

  1. Perform visual examination of the specimen. Record any defects.
  2. Strip 0.5 inches of insulation from both ends of the specimen and twist together.
  3. Place specimen in a water bath with the ends secured above the water. Let sample soak for the specified duration.
  4. Attach specimen ends to the test circuit leads.
  5. Turn on test system voltage and slowly increase to desired voltage.
  6. Allow system to stabilize at maximum voltage. Record voltage and leakage current.
  7. Slowly lower the applied voltage.
  8. Report the specimen length, maximum voltage, and maximum current from the test.

Covered specifications

  • ANSI NEMA HP-3 Method 6.2.3
  • ASTM D3032 Section 8
  • AS22759 Paragraph 5.4.4
  • AS4373 Method 510
  • EN3475 Method 302
  • FED-STD-228 Method 6111
  • ISO 19642-2 Method 5.2.3
  • J1128 Method 6.4
  • MIL-DTL-17 Method 4.8.4
  • MIL-DTL-24643C Method 4.9.8
  • MIL-DTL-25038 Method 4.6.6
  • MIL-DTL-26482 Method 4.6.10
  • MIL-DTL-38999 Method 4.5.11
  • MIL-DTL-83733 Method 4.7.17.1
  • MIL-PRF-55339 C Method 4.5.13
  • MIL-STD-202 Method 301
  • MIL-STD-2223 Method 3005
  • MIL-W-81822 Method 4.6.20
  • NEMA 27500 Method 4.3.3
  • NEMA 27500 Method 4.3.7
  • ISO 6722 Method 5.5
  • AMS 8660 Method 4.6.10
  • AS23053 Rev A Method 5.02
  • AS23053 Rev A Method 5.06.2C
  • AS4373 Method 711-4.7
  • AS6370 Method 4.6.2
  • AS654 Method 5.3.11
  • AS85485 Method 5.27.1
  • AS85485 Method 5.27.2
  • ICEA S-81-570 Method 3.3.2
  • J1127 Method 6.04
  • J1128 Method 6.05
  • J1654 Method 5.1
  • J2394 Method 6.2.5
  • MIL-C-82621 Method 4.4.3.1
  • MIL-DTL-17 Method 4.8.04
  • MIL-DTL-24643D Method 4.9.08
  • MIL-DTL-49055G Method 4.7.4
  • MIL-DTL-81381 Method 4.6.4.17.3
  • MIL-M-24041 Method 4.7.4.2
  • MIL-M-24041 Method 4.7.4.6
  • NEMA WC 70 Method 6.10.1
  • SAE J2031 Method 4.02
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