5.2.1 General The electric strength

5.2.1 General The electric strength of the SOLID INSULATION used in the equipment shall be adequate. Compliance is checked in accordance with 5.2.2 while the equipment is still in a well-heated condition immediately following the temperature test in 4.5.2. If a component or subassembly is tested separately outside the equipment, it is brought to the temperature attained by that part during the temperature test in 4.5.2 (for example, by placing it in an oven) prior to performing the electric strength test. However, it is permitted to conduct electric strength testing of thin sheet material for SUPPLEMENTARY INSULATION or REINFORCED INSULATION,according to 2.10.5.9 or 2.10.5.10, at room temperature. No electric strength test applies to insulation in a transformer between any winding and the core or screen, provided that the core or screen is totally enclosed or encapsulated and there is no electrical connection to the core or screen. However, the tests between parts that have terminations continue to apply