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The Gauge Guide bullets will help you determine the overall size (including insulation) of an unmarked cable.
Actual diameters may vary depending on the age, make and insulation thickness of your cable.
If you are still not sure, the most accurate way to measure your cable is to determine the area in mm² of the copper conductors.
As an example, let's assume we want to know the area for 6 B&S cable:
In this case we have 168 strands @ 0.32mm each. Knowing this we now do the following calculations:
Therefore the approximate area for 6 B&S cable is 13.50mm²
Cable Size |
Nom Area mm² |
Nom O.D.mm |
Amp Rating |
Part # Prefix |
Gauge Guide |
8 B&S |
7.71 |
5.5 |
74 |
C8 |
|
6 B&S |
13.5 |
7.2 |
103 |
C6 |
|
4 B&S |
20.26 |
8.3 |
135 |
C4 |
|
3 B&S |
26.45 |
10.2 |
168 |
C3 |
|
2 B&S |
32.07 |
11.3 |
188 |
C2 |
|
1 B&S |
39.55 |
12.1 |
210 |
C1 |
|
0 B&S |
49.00 |
12.7 |
246 |
C0 |
|
00 B&S |
64.15 |
14.5 |
292 |
C00 |
|
000 B&S |
83.19 |
16.4 |
335 |
C000 |
|
0000 B&S |
99.27 |
17.5 |
399 |
C0000 |
|
Twin 8 B&S |
7.71 |
7.1 x 12.5 |
59 |
C2TS-8 |
|
Twin 6 B&S |
13.5 |
8.8 x 16 |
82 |
C2TS-6 |
|
Twin 4 B&S |
20.26 |
10.3 x 18.6 |
108 |
C2TS-4 |
|
Twin 2 B&S |
32.07 |
13.4 x 24.6 |
150 |
C2TS-2 |
It is recommended for applications over 5m in length that you increase the cable gauge by at least one size.