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Withstand voltage
Test sample
Prepare a test sample of a minimum length of 350 mm, strip 25 mm of insulation from each end and twist the
conductor ends together to form a loop.
Apparatus
Partially fill a non-conductive vessel with saltwater (3 % by weight of NaCl in water) with the ends of the test sample
emerging above the bath as shown in Figure 1. Use a voltage source of a frequency of 50 Hz or 60 Hz.
600 V cable
After completing a procedure identical to that of Immerse the test sample in the bath1for 4 h and apply a test voltage of 1 kV (rms) for 30 min
between conductor and the bath. Then increase the voltage at a rate of 500 V/s until the following value is reached:
3 kV (rms) for cables < 0,5 mm2;
5 kV (rms) for cables W 0,5 mm2. hold the value 3 kV or 5 kV for 5 min.
Table 5 — Insulation faults
Voltage rating
kV (rms)
ISO conductor size
mm2
60 V cables 600 V cables
< 0,5 3 6
W 0,5 5 8
The test electrode may consist of metal ball chains, metal brushes, or any other type of suitable electrode. Choose
the electrode length and frequency considering the speed of the cable running through the field of the electrode so
that each point of the cable is loaded by at least nine voltage cycles.
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