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Resistance Heating
Ribbon Wire
Nickel-Chromium Alloy
80% Nickel/20% Chromium
NCRR Series
30 m (100') Spool
(80Ni-20Cr) is Proven
to Deliver Outstanding
Performance Over
Extended Periods of
U Nickel-Chromium Wire
U Uniformity of Resistance
U Mechanical Stability
U Fine Surface Finish
Resistance Wire–Current vs. Temperature
Current Carrying Capacity of Straight Nickel Chromium Wire
Approximate amperes to heat a straight, oxidized wire in quiet air to given temperature
°F 400 600 800 1000 1200 1400
°C 205 315 427 538 649 760
AWG or Inches
B & S Diameter Amperes
15 0.057 7.2 10.0 12.8 16.1 20.0 24.5
16 0.051 6.4 8.7 10.9 13.7 17.0 20.9
17 0.045 5.5 7.5 9.5 11.7 14.5 17.6
18 0.040 4.8 6.5 8.2 10.1 12.2 14.8
19 0.036 4.3 5.8 7.2 8.7 10.6 12.7
20 0.032 3.8 5.1 6.3 7.6 9.1 11.0
21 0.0285 3.3 4.3 5.3 6.5 7.8 9.4
22 0.0253 2.9 3.7 4.5 5.6 6.8 8.2
23 0.0226 2.58 3.3 4.0 4.9 5.9 7.0
24 0.0201 2.21 2.9 3.4 4.2 5.1 6.0
25 0.0179 1.92 2.52 3.0 3.6 4.3 5.2
26 0.0159 1.67 2.14 2.60 3.2 3.8 4.5
27 0.0142 1.44 1.84 2.25 2.73 3.3 3.9
28 0.0126 1.24 1.61 1.95 2.38 2.85 3.4
29 0.0113 1.08 1.41 1.73 2.10 2.51 2.95
30 0.0100 0.92 1.19 1.47 1.78 2.14 2.52
31 0.0089 0.77 1.03 1.28 1.54 1.84 2.17
32 0.0080 0.68 0.90 1.13 1.36 1.62 1.89
33 0.0071 0.59 0.79 0.97 1.17 1.40 1.62
34 0.0063 0.50 0.68 0.83 1.00 1.20 1.41
35 0.0056 0.43 0.57 0.72 0.87 1.03 1.21
36 0.0050 0.38 0.52 0.63 0.77 0.89 1.04
37 0.0045 0.35 0.46 0.57 0.68 0.78 0.90
38 0.0040 0.30 0.41 0.50 0.59 0.68 0.78
39 0.0035 0.27 0.36 0.42 0.49 0.58 0.66
40 0.0031 0.24 0.31 0.36 0.43 0.50 0.57
Time and is the Same
Wire OMEGA Uses in
Our Own Electrical
Heating Elements
100' spool of NCCR-15-100
shown smaller than actual size.
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Current Carrying Capacity of Ribbon
Nickel Chromium Wire
At 648°C (1200°F) Approximate
Width-Inches
Thickness
in Inches Amps
0.0063 1.56 2.89 5.5 8.2 10.1 16.6
0.0056 1.45 2.69 5.2 7.2 9.5 15.6
0.0050 1.35 2.52 4.9 6.8 9.0 14.7
0.0045 1.26 2.38 4.6 6.4 8.5 14.0
0.0040 1.18 2.23 4.1 6.0 8.0 13.1
0.0035 1.09 2.07 3.8 5.6 7.5 12.3
0.0031 1.01 1.94 3.6 5.3 7.0 11.5
0.0020 — — — — — —
0.0015 4 — — — — —
The current values above are based on actual tests
of single strands of oxidized wire mounted in quiet air
and operated at 648°C (1200°F). The tables are
calculated for wire having a resistivity at 648°C
(1200°F) and a total surface watts-density of 28 W per
square inch.
1
1
⁄64
1
⁄32
3
⁄16
1
⁄32
3
⁄8
⁄16
To Order
Model No. Thickness Width Ω/ft*
NCRR-1-100 0.0015"
NCRR-2-100 0.002"
NCRR-3-100 0.0031"
NCRR-4-100 0.0035"
NCRR-5-100 0.004"
NCRR-6-100 0.0045"
NCRR-7-100 0.005"
NCRR-8-100 0.0056"
NCRR-9-100 0.0063"
NCRR-10-100 0.002"
NCRR-11-100 0.0031"
NCRR-12-100 0.0035"
NCRR-13-100 0.004"
NCRR-14-100 0.0045"
NCRR-15-100 0.005"
NCRR-16-100 0.0063"
NCRR-17-100 0.0031"
NCRR-18-100 0.0035"
NCRR-19-100 0.004"
NCRR-20-100 0.0045"
NCRR-21-100 0.005"
NCRR-22-100 0.0056"
NCRR-23-100 0.0063"
NCRR-25-100 0.0031"
NCRR-26-100 0.0035"
NCRR-27-100 0.0045"
NCRR-28-100 0.0063"
NCRR-29-100 0.0031"
NCRR-30-100 0.0035"
NCRR-31-100 0.004"
NCRR-32-100 0.0045"
NCRR-33-100 0.005"
NCRR-34-100 0.0056"
NCRR-35-100 0.0031"
NCRR-36-100 0.0035"
NCRR-37-100 0.004"
NCRR-38-100 0.0045"
NCRR-39-100 0.005"
* Resistance tolerance: ±5%
Ordering Example: NCRR-15-100, 100' spool of 0.0035" thickness
of heating ribbon wire.
1
⁄64" 22.75
1
⁄64" 17.36
1
⁄64" 11.20
1
⁄64" 9.99
1
⁄64" 8.68
1
⁄64" 7.12
1
⁄64" 6.95
1
⁄64" 6.20
1
⁄64" 5.51
1
⁄32" 9.83
1
⁄32" 5.60
1
⁄32" 4.96
1
⁄32" 4.34
1
⁄32" 3.86
1
⁄32" 3.47
1
⁄32" 2.76
1
⁄16" 3.17
1
⁄16" 2.81
1
⁄16" 2.46
1
⁄16" 1.93
1
⁄16" 1.74
1
⁄16" 1.55
1
⁄16" 1.38
3
⁄32" 2.11
3
⁄32" 1.87
3
⁄32" 1.46
3
⁄32" 0.91
1
⁄8" 1.59
1
⁄8" 1.40
1
⁄8" 1.23
1
⁄8" 1.09
1
⁄8" 0.98
1
⁄8" 0.88
3
⁄16" 0.88
3
⁄16" 0.78
3
⁄16" 0.68
3
⁄16" 0.60
3
⁄16" 0.54
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