ELONGATION & SPRINGINESS FOR ENAMELLED ROUND COPPER WINDING WIRES 
(BASIS : IS 13730 - .. & IS 13778 - 3)
Nominal Conductor
Diameter
Elongation to Break Test Method Springback Requirements (degrees)
Type Mandrel Tension
(SWG) (MM) (%)   (mm) (N) Grade 1 Grade 2 Grade 3
11 2.946 34 Bending
by 30
- - 5 5 5
12 2.642 34 - - 5 5 5
13 2.337 33 - - 5 5 5
14 2.032 33 - - 5 5 5
15 1.829 33 - - 5 5 5
16 1.626 32 - - 5 5 5
17 1.422 32 Five
turns
around
the mandrel
50.00 15.00 28 30 32
18 1.219 31 50.00 15.00 35 37 39
19 1.016 30 50.00 15.00 39 41 43
20 0.914 30 50.00 15.00 42 45 47
21 0.813 29 50.00 15.00 45 48 51
22 0.711 28 37.50 12.00 41 43 46
23 0.610 27 37.50 12.00 46 50 53
24 0.559 26 25.00 8.00 41 44 48
25 0.508 26 25.00 8.00 41 44 48
26 0.457 25 25.00 8.00 43 47 51
27 0.417 25 25.00 8.00 44 48 53
28 0.376 24 19.00 4.00 45 50 55
29 0.345 23 19.00 4.00 48 53 59
30 0.315 23 19.00 4.00 50 55 62
31 0.295 23 19.00 4.00 50 55 62
32 0.274 22 12.50 2.00 47 53 61
33 0.254 22 12.50 2.00 47 53 61
34 0.234 22 12.50 2.00 49 56 65
35 0.213 21 12.50 2.00 51 59 68
36 0.193 21 10.00 1.00 54 62 72
37 0.173 20 10.00 1.00 57 65 75
38 0.152 19 10.00 1.00 59 67 78
39 0.132 18 7.00 0.50 59 67 79
40 0.122 17 7.00 0.50 62 70 84
41 0.112 17 7.00 0.50 64 73 88
42 0.102 17 7.00 0.50 64 73 88
43 0.091 16 5.00 0.25 64 73 90
44 0.081 15 5.00 0.25 67 77 94
45 0.071 13 - - - - -
46 0.061 12 - - - - -
47 0.051 10 - - - - -
48 0.041 9 - - - - -
Note : For intermediate conductor sizes the elongation value and springback figure of the next largest nominal
          conductor diameter shall be taken.
Note: In view of continuous improvements in design & process specifications given above are subject to change without notice.