Enamelled Fibreglass Covered Copper Winding Wires Manufacturers & Suppliers in Mumbai, India

What Are Enamelled / Fibreglass-Covered Copper Winding Wires?

These are specialised copper conductors coated with enamel or wrapped with layers of fibreglass insulation. The insulation is then varnish-treated for added mechanical strength, heat resistance, and dielectric performance.

Types Available

Fibreglass Covered (Single / Double Covering)
Round & Rectangular Winding Wires

These wires offer stable performance in F Class (155°C) and H Class (180°C) electrical machinery.

Key Benefits of Fibreglass-Covered Copper Wire

High Temperature Resistance
Perfect for motors, transformers & generators operating in harsh conditions.
Superior Mechanical Strength
Fibreglass insulation provides protection from vibration, abrasion, and mechanical stress.
Excellent Electrical Performance
High BDV values ensure safe operation under electrical load.
Moisture & Chemical Resistance
Ideal for submersible motor winding applications.
Long Life & Reliability
Varnish-treated glass covering improves insulation bonding and durability.
Suitable for Heavy-Duty Operations
Used in industrial-grade winding systems requiring maximum performance.

Fibreglass-Covered Varnish Treated Bare / or Enamelled Copper Wires

Rectangular Wires

Property	Type Class	Bare 155 Class	Bare 180 Class	Enamelled 155 Class	Enamelled 180 Class
Standard	IS:13730	Part 32	Part 31	Part 32	Part 31
	NEMA-1000	MW-42C	MW-52C	MW-46C	MW-53C
	IEC - 60317	Part 32	Part 31	Part 32	Part 31
Size	mm	2.5 mm T	2.5 mm T	2.5 mm T	2.5 mm T
Covering	Double	Grade G2	Grade G2	Grade 2 G2	Grade 2 G2
Elongation (%)	IS/IEC - Min.	30	30	30	30
	NEMA-Min	32	32	32	32
	BIC Value	40	40	40	40
	IS/IEC - Max.	5.0	5.0	5.5	5.5
	NEMA-Min	5.0	5.0	5.0	5.0
	BIC Value	3.8	3.8	4.2	4.2
Springness (DEG.)	IS/IEC - Max.	5.5	5.5	5.5	5.5
Springness (DEG.)	BIC Value	4.0	4.0	4.5	4.5
Flexibility (NO CRACK)	IS/IEC	10 x w/T	10 x w/T	10 x w/T	10 x w/T
Flexibility (NO CRACK)	BIC Value	8 x w/T	8 x w/T	8 x w/T	8 x w/T
Adherence (10% PREST.)	IS/IEC - Max.	No Crack	No Crack	No Crack	No Crack
	NEMA-Min	20% - No Crack	20% - No Crack	20% - No Crack	20% - No Crack
	BIC Value	No Crack	No Crack	No Crack	No Crack
BDV (V)	IS/IEC - Min.	560	560	2560	2560
	NEMA-Min	480	480	2980	2980
	BIC Value	900	900	3200	3200
Range(mm)	Width	2.0 - 12.0	2.0 - 12.0	2.0 - 12.0	2.0 - 12.0
Range(mm)	Thickness	0.80 - 4.0	0.80 - 4.0	0.80 - 4.0	0.80 - 4.0
Application		For F class Motors, Transformers, Coils	For H class Motors, Transformers, Coils	For F class Motors, Transformers, Coils	For H class Motors, Transformers, Coils

Round Wires

Property	Type Class	BARE 155 Class	BARE 180 Class
Standard	IS:4685	Part I	Part I
Covering	Double	Double	Double
Elongation (%)	IS - Min	30	30
	NEMA-Min	35	35
	BIC Value	38	38
Flexibility (No Crack)	IS-Min	10 X d	10 X d
	NEMA-Min	10 X d	10 X d
	BIC Value	5 X d	5 X d
Heat Shock 48 HRS. Unbent	IS - Min	175 Deg. C	200 Deg. C
	NEMA-Min	175 Deg. C	200 Deg. C
	BIC Value	200 Deg. C	220 Deg. C
Tackiness 65 DEG. C-5 MIN	IS-Min	No Tacky	No Tacky
	NEMA-Min	No Tacky	No Tacky
	BIC Value	No Tacky	No Tacky
BDV (V)	IS - Min	450	450
	NEMA-Min	315	315
	BIC Value	900	900
Range (mm)		3.0 to 12.0	3.0 to 12.0

Increase in Covering Dimension

Fibreglass-Covered Rectangular Wires

Width (mm)		Glass Fibre Bare (mm)				Glass Fibre Enamelled (mm)
		Single	Grade G1	Double	Grade G2	Single	Grade 2 G1	Double	Grade 2 G2
Over	Upto	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
-	3.15	0.10	0.18	0.21	0.33	0.24	0.36	0.35	0.49
3.15	6.30	0.12	0.20	0.23	0.37	0.26	0.38	0.38	0.52
6.30	12.50	0.14	0.24	0.27	0.43	0.28	0.42	0.43	0.57
12.50	16.00	0.17	0.29	0.31	0.47	0.30	0.46	0.46	0.62

Fibreglass-Covered Round Wires

Size (mm)	Tolerance +/-	Double covering Overall Dia. Max	Covering Min.	Resistance 0hm meter at 20 Deg. C
mm	mm	mm	mm	Nom.
3.00	0.030	3.285	0.200	0.0024180
3.15	0.032	3.435	0.200	0.0021932
3.35	0.034	3.690	0.200	0.0019391
3.55	0.036	3.890	0.250	0.0017268
4.00	0.040	4.345	0.250	0.0013601
4.50	0.045	4.845	0.250	0.0010747
5.00	0.050	5.345	0.250	0.0008705
5.50	0.055	5.845	0.250	0.0007194
6.00	0.060	6.345	0.250	0.0006045
6.50	0.065	6.845	0.250	0.0005151
7.00	0.070	7.345	0.300	0.0004441
7.50	0.075	7.845	0.300	0.0003869
8.00	0.080	8.345	0.300	0.0003400

Applications of Enamelled / Fibreglass-Covered Copper Wire

These wires are widely used in:

HV/LV transformers

Electric motors (F & H Class)

Generators

Submersible motor windings

Induction coils

Electromagnetic coils

Heavy-duty industrial windings

Power equipment manufacturing

FAQ Section – People Also Ask

What is fibreglass-covered copper winding wire?

It is a copper conductor wrapped with layers of heat-resistant fibreglass yarn, ideal for high-temperature electrical equipment.

Is fibreglass insulation better than enamel?

Fibreglass is stronger, highly heat-resistant, and suitable for harsh industrial environments. Enamel provides smooth insulation for compact windings.

What temperature classes are available?

We offer Class 155°C (F Class) and Class 180°C (H Class).

Where are these wires used?

Transformers, motors, generators, high-voltage coils, and heavy-duty industrial winding systems.

What is the price of fibreglass copper conductor?

The price depends on size, insulation grade, copper rate, and quantity. Contact us for wholesale or export pricing.