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What is the thickness of the layers of Class F insulation and what material is layers made of?

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in Design of Electrical Machines by (687k points)
What is the thickness of the layers of Class F insulation and what material is layers made of?

(a) 0.18 mm, asbestos paper

(b) 0.10 mm, asbestos paper

(c) 0.18 mm, thick epoxy treated asbestos paper

(d) 0.10 mm, thick epoxy treated asbestos paper

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This intriguing question originated from Design of Field Winding in portion Design of Synchronous Machines of Design of Electrical Machines

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The correct choice is (c) 0.18 mm, thick epoxy treated asbestos paper

The best I can explain: The thickness of the layers is 0.18 mm. The layers are made up of thick epoxy treated asbestos paper.

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