[TowerTalk] Wiring Sky Needle tower for 220 VAC

Grant Saviers grants2 at pacbell.net
Tue Nov 5 14:32:16 EST 2013

Another alternative is the Home Depot 6/4 aluminum cable, when I bought 
165' for a 50amp  construction drop they called it "hot tub wire".  
About a buck a foot, so more ampacity than #10 Cu at lower cost and ok 
for direct burial.

Grant KZ1W

On 11/5/2013 9:31 AM, Richard Karlquist wrote:
> On 2013-11-04 22:48, Ray Benny wrote:
>> I have an older 90 ft Triex Sky Needle that I have been working on. I'm
>> down to the wiring of the raising/lowering motor. Because of the long
>> distance, I ran four conductors (250 ft) of #10 wire. The motor current
>> draw for 220 VAC is 9 amps, versus 18 amps for 110 VAC. There would be a
> I had exactly the same situation with my HDX-5106 and the motor
> worked (barely) with 4 #10 250 feet on 120VAC.  I have since moved
> the shack much closer so this problem went away, but if I had
> not, the plan was to put a 240VAC to 120VAC transformer at the tower.
> This seemed to be much easier (and idiot proof) compared to monkeying
> around with the electrical stuff at the tower.  I have a number of
> big transformers I have acquired over the years.  Anything with dual
> primaries can be wired as a step down autotransformer (you don't
> need isolation).  Also, a 120VAC isolation transformer can be wired
> as an autotransformer.  I picked up a 5 kVA unit at a swap meet.
> As an autotransformer, it is good for 10kVa.
> Rick N6RK
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