Maximum safe temperature for class H insulation material is

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ISRO (VSSC) Technician Electrician  Feb 2019 Official Paper
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  1. 160°C
  2. 180°C
  3. 200°C
  4. 220°C 

Answer (Detailed Solution Below)

Option 2 : 180°C
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Detailed Solution

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There is 7 class of insulating materials, each suitable for different application:

The permissible temperature limit at which the insulators may be worked safely without deterioration depends upon the type and class of the insulation as detailed below.

Class Y - Maximum temperature 90°C

Class A - Maximum temperature 105°C

Class E - Maximum temperature 120°C

Class B - Maximum temperature 130°C

Class F - Maximum temperature 155°C

Class H - Maximum temperature 180°C

Class C - Maximum temperature above 180°C (limited stability up to 225°C)
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