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Correction factor of coil resistance measurements

When looking at drawings, technical documents and specifications wire size can be shown in a variety of forms, however, when programming the winding machine most often you require mm.... make sense of it all here.

Use the Yellow cells to input your wire size, the Blue cell will show the conversion.

CSA = Cross sectional area.

	AWG - Bare Wire Diameter of Copper excluding insulation (AWG 1 - AWG 56)
This wire can be expressed as:	Ømm	Øinches
With the following CSA:	mm^2	inches^2 .

	SWG - Bare Wire Diameter of Copper excluding insulation (SWG 1 - SWG 50)
This wire can be expressed as:	Ømm	Øinches
With the following CSA:	mm^2	inches^2

Optimum Wire tension calculations

When winding it is vital that wire tension is optimised to achieve a good winding.
Use the Yellow cells to input your wire size, the Blue cell will recommend the optimum tension.

(mm)- Bare Wire Diameter of Copper excluding insulation

Optimum tension for this wire is: Grams // KG // Lbs // Ounces.

Correction factor of coil resistance measurements

When making winding resistance measurements, a given tolerance band from coil drawing will be set at a nominal ambient temperature
Use the Yellow cells below to adjust your reading from room temp. The Blue cell will show corrected actual reading.
Please bear in mind for air coils the measurement will require 8-12 hours to settle.

25 Deg Nominal

Room temperature

Resistance in Ohms

The corrected resistance for this reading to 25 deg nominal is Ohms

20 Deg Nominal

Room temperature

Resistance in Ohms

The corrected resistance for this reading to 20 deg nominal is Ohms

Wire specifications-definition

When investigating the various wire types available on the market today, it can become a mine field of specification numbers and complex variations thereof .

The list shown below aims to be a guide in simplifying this process.

Specification	Part	Sheet	Description	NEMA
IEC 60317	0	1	General requirements - Enamelled round copper wire
IEC 60317	0	2	General requirements - Enamelled rectangular copper wire
IEC 60317	0	3	General requirements - Enamelled round aluminium wire
IEC 60317	0	4	General requirements - Glass-fibre wound resin or varnish impregnated, bare or enamelled rectangular copper wire
IEC 60317	0	5	General requirements - Glass-fibre braided resin or varnish impregnated, bare or enamelled rectangular copper wire
IEC 60317	0	6	General requirements - Glass-fibre wound resin or varnish impregnated, bare or enamelled round copper wire
IEC 60317	1		Polyvinyl acetal enamelled round copper wire, class 105
IEC 60317	2		Solderable polyurethane enamelled round copper wire, class 130, with a bonding layer	MW 29-C
IEC 60317	3		Polyester enamelled round copper wires, class 155
IEC 60317	4		Solderable polyurethane enamelled round copper wire, class 130	MW 75-C
IEC 60317	7		Polyimide enamelled round copper wire, class 220	MW 16-C
IEC 60317	8		Polyesterimide enamelled round copper wire, class 180
IEC 60317	10		Enamelled round copper wires with a temperature index of 180 for use in refrigerant systems
IEC 60317	11		Bunched solderable polyurethane enamelled round copper wires, class 130, with silk covering
IEC 60317	12		Polyvinyl acetal enamelled round copper wire, class 120
IEC 60317	13		Polyester or polyesterimide overcoated with polyamide-imide enamelled round copper wire, class 200	MW 35- C/A
IEC 60317	14		Polyvinyl acetal enamelled round aluminium wire, class 105
IEC 60317	15		Polyesterimide enamelled round aluminium wire, class 180
IEC 60317	16		Polyester enamelled rectangular copper wire, class 155
IEC 60317	17		Polyvinyl acetal enamelled rectangular copper wire, class 105
IEC 60317	18		Specifications for particular types of winding wires. Part 18: Polyvinyl acetal enamelled rectangular copper wire, class 120
IEC 60317	19		Solderable polyurethane enamelled round copper wire, overcoated with polyamide, class 130	MW 28-C
IEC 60317	20		Solderable polyurethane enamelled round copper wire, class 155	MW 79-C
IEC 60317	21		Solderable polyurethane enamelled round copper wire overcoated with polyamide, class 155	MW 80-C
IEC 60317	22		Polyester or polyesterimide enamelled round copper wire overcoated with polyamide, class 180	MW 76-C/A
IEC 60317	23		Solderable polyesterimide enamelled round copper wire, class 180	MW 77-C
IEC 60317	24		Polyester or polyesterimide enamelled round aluminium wire overcoated with polyamide, class 180
IEC 60317	25		Polyester or polyesterimide overcoated with polyamide-imide enamelled round aluminium wire, class 200	MW 35-A
IEC 60317	26		Polyamide-imide enamelled round copper wire, class 200	MW 16-C
IEC 60317	27		Paper tape covered rectangular copper wire	MW 33-C
IEC 60317	28		Polyesterimide enamelled rectangular copper wire, class 180
IEC 60317	29		Polyester or polyesterimide overcoated with polyamide-imide enamelled rectangular copper wire, class 200	MW 36-C
IEC 60317	30		Polyimide enamelled rectangular copper wire, class 220	MW 20-C
IEC 60317	31		Glass-fibre wound resin or varnish impregnated, bare or enamelled rectangular copper wire, temperature index 180
IEC 60317	32		Glass-fibre wound, resin or varnish impregnated, bare or enamelled rectangular copper wire, temperature index 155
IEC 60317	33		Glass-fibre wound resin or varnish impregnated, bare or enamelled rectangular copper wire, temperature index 200
IEC 60317	34		Polyester enamelled round copper wire, class 130L
IEC 60317	35		Solderable polyurethane enamelled round copper wire, class 155, with a bonding layer
IEC 60317	36		Solderable polyesterimide enamelled round copper wire, class 180, with a bonding layer	MW 1000
IEC 60317	37		Polyesterimide enamelled round copper wire, class 180, with a bonding layer
IEC 60317	38		Polyester or polyesterimide overcoated with polyamide-imide enamelled round copper wire, class 200, with a bonding layer	MW 102-C
IEC 60317	39		Glass-fibre braided resin or varnish impregnated, bare or enamelled rectangular copper wire, temperature index 180
IEC 60317	40		Glass-fibre braided resin or varnish impregnated, bare or enamelled rectangular copper wire, temperature index 200	MW 43-C
IEC 60317	41		Solderable polyester enamelled round copper wire, class 130L
IEC 60317	42		Polyester-amide-imide enamelled round copper wire, class 200
IEC 60317	43		Aromatic polyimide tape wrapped round copper wire, class 240
IEC 60317	44		Aromatic polyimide tape wrapped rectangular copper wire, class 240
IEC 60317	45		Polyester enamelled round copper wire, class 130
IEC 60317	46		Aromatic polyimide enamelled round copper wires, class 240	MW16/20
IEC 60317	47		Aromatic polyimide enamelled rectangular copper wire, class 240
IEC 60317	48		Glass-fibre wound resin or varnish impregnated, bare or enamelled round copper wire, temperature index 155
IEC 60317	49		Glass-fibre wound resin or varnish impregnated, bare or enamelled round copper wire, temperature index 180
IEC 60317	50		Glass-fibre wound resin or varnish impregnated, bare or enamelled round copper wire, temperature index 200
IEC 60317	51		Solderable polyurethane enamelled round copper wire, class 180	MW-82C
IEC 60317	52		Aromatic polyamide (aramid) tape wrapped round copper wire, temperature index 220
IEC 60317	53		Aromatic polyamide (aramid) tape wrapped rectangular copper wire, temperature index 220
IEC 60317	54		Polyester enamelled round copper wire, class 155L

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