Grades For Enameled Wire

Enamel wire is typically made in three “grades”, with the number related to the thickness of enamel (usually assumed to be the number of coating layers):
Grade 1 - thinnest insulation, single layer
Grade 2 - medium insulation, double layer
Grade 3 - thickest insulation, triple layer
Grade 3 of enamelled wire should not be confused with triple-insulated wire.

For example, a comparison of the dimensions for 0.5 mm enamelled wire is as shown in the table below. The higher grades have significantly increased voltage breakdow

Manufacturer data for 0.5 mm nominal diameter enamelled wire (circular cross-section)
Grade	Min. diameter (mm)	Max. diameter (mm)	Elongation (%)	Breakdown voltage (V)	Tension (cN)
Grade 1	0.524	0.544	28	2400	1287
Grade 2	0.545	0.566	28	4600	1287
Grade 3	0.567	0.587	28	7000	1287

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