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Insulation Resistance

Test Method: EN 50395 Section 8.
Requirements: Minimum values (i) at 20°C: 10^14ohms.cm (ii) at 90°C: 10^11 You are not allowed to view links. Register or Login
Procedure: A 5 metre length of cable is immersed in a water bath (except for approximately 150 mm at each end) at a temper ature of 20°C ± 5°C for a period of 2 hours. Following this, the specimen length is then checked for its insulation resistance by applying an AC test voltage of between 80 and 500 Volts (50 – 60 Hz) for a period of 1 minute between the conductor and the water. The insulation resistance R expressed in You are not allowed to view links. Register or Login shall be such that thecoefficient K determined using the formula:

K= LR/ Log (D/d)

R= measured insulation resistance (MΩ)
D = mean outer diameter of cable (mm)
d = mean diameter of core (mm)
L = immersed length (m)

The procedure shall also be carried out at a temperature of 90°C.

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