As you can see from the area of the conductor from the chart below, your
examples are actually understated, and your conclusion is faulty.
Two #18 will give you almost a #12 capacity, rather than #15 and
Two #15 will give you almost a #9 capacity, rather than #12
Each paring does not reduce the "gage" by 3.
AWG Di. in. Di. mm ohms/1kFt. ohms/km (1) (2) (3)
(4)
8 0.1285 3.2639 0.6282 2.060496 73 24 1650 Hz
480 lbs
9 0.1144 2.90576 0.7921 2.598088 64 19 2050 Hz
380 lbs
10 0.1019 2.58826 0.9989 3.276392 55 15 2600 Hz
314 lbs
11 0.0907 2.30378 1.26 4.1328 47 12 3200 Hz
249 lbs
12 0.0808 2.05232 1.588 5.20864 41 9.3 4150 Hz
197 lbs
13 0.072 1.8288 2.003 6.56984 35 7.4 5300 Hz
150 lbs
14 0.0641 1.62814 2.525 8.282 32 5.9 6700 Hz
119 lbs
15 0.0571 1.45034 3.184 10.44352 28 4.7 8250 Hz
94 lbs
16 0.0508 1.29032 4.016 13.17248 22 3.7 11 kHz
75 lbs
17 0.0453 1.15062 5.064 16.60992 19 2.9 13 kHz
59 lbs
18 0.0403 1.02362 6.385 20.9428 16 2.3 17 kHz
47 lbs
19 0.0359 0.91186 8.051 26.40728 14 1.8 21 kHz
37 lbs
20 0.032 0.8128 10.15 33.292 11 1.5 27 kHz
29 lbs
(1) Maximum amps for chassis wiring
(2) Maximum amps for power transmission
(3) Maximum frequency for 100% skin depth for solid conductor copper
(4) Breaking force Soft Annealed Cu 37000 PSI
AWG Di. mm Area sq.mm.
8 3.2639 10.2538
9 2.90576 9.12871 *2= 18.25743
10 2.58826 8.13126 *2= 16.26252
11 2.30378 7.23754 *2= 14.47508
12 2.05232 6.44755 *2= 12.89511
15 1.45034 4.55638 *2= 9.112755
18 1.02362 3.21580 *2= 6.431594
----------
73 de George, KD0RII
On 5/10/2016 11:49, W5GN wrote:
FWIW, it's certainly new, but I just read that if you
pair two #18 gage wires,
you have #15 gage capacity, and if then pair the two #15's,
you have #12 gage capacity.
Each paring reduces the gage by 3.
Barry, W5GN
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Wilson
Sent: Tuesday, May 10, 2016 11:24 AM
To: towertalk <towertalk@contesting.com>
Subject: [TowerTalk] Rotor Control Cable
Did u check the wire gauges?
If your run is “long”, you need two motor power wires of larger gauge.
I don’t know what “long” is.
WL
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