Individual varnishes behave differently when applied to the same fibrous- or film-wrapped magnet wire when exposed to elevated temperatures. Likewise, a varnish does not always behave the same when applied to different types of fibrous or film-wrapped magnet wires and when exposed to elevated temperatures.

FIG. 1 Jig for Forming Wire

1. Scope

1.1 This test method covers the determination of thermal endurance of rectangular and square fibrous- or film-wrapped magnet wire coated with an insulating varnish.

1.2 The values given in SI units are the standard. The values given in parentheses are for information only.

1.3 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. A specific precautionary statement is given in Section 5.

Note 1—There is no similar or equivalent IEC Standard.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1711 Terminology Relating to Electrical Insulation

D2307 Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire

D3353 Test Methods for Fibrous-Insulated Magnet Wire

Keywords

electrical insulating; fibrous-wrapped wire; film-wrapped wire; thermal endurance; varnish; Electrical insulating varnishes; Electrical measurements; Magnet wire; Polymers (electrical insulation applications); Resins; Thermal endurance--electrical insulating materials; Voltage

ICS Code

ICS Number Code 29.060.10 (Wires)

Citing ASTM Standards

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