ASTM D3353 : 04

1.1 These test methods cover the testing of fibrous-insulated electrical conductors, commonly referred to as magnet wire, which are used in electrical apparatus. The test methods are intended primarily for evaluation of the electrical insulating materials used. It is intended that these test methods be used, except where modified by individual specifications for particular applications.

1.1.1 These test methods apply to those magnet wires that are fiber-covered and in which the substrate is bare conductor or is coated with an underlying insulating film as covered by Test Methods D 1676. Fiber-covered wires are produced by serving helically or wrapping fibers or fibrous-tape insulation uniformly around the wire in single and multiple layers. The served or wrapped materials are bonded or not bonded to the underlying wire.

1.2 The values stated in inch-pound units are the standard. The SI equivalents of inch-pound units are provided for reference.

1.3 The test methods appear in the following sections:

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.See and for specific caution statements.

1.4 This standard and IEC 60851 are similar if not equivalent in technical content.

1.5 This standard and NEMA, MW 1000 are similar if not equivalent in technical content.