[AMRadio] #4 wire from mains? - they gotta be kidding


DAVID O'NEILL W9NTO at ISP.COM
Wed May 9 19:36:10 EDT 2007


> IF YOU LOOK AT THE OLD WIRE TABLES OF THE 1950 YOU WILL FIND THE
INSULATION RATINGS ABOUT 20%OR MORE LESS THAN TODAYS.






I've been reading the Gates BC-1T manual and found two instances where
> they state that #4 wire should be used.  One says:
>
>  "3) ...provide #4 or larger primary wiring from entrance box to
> transmitter".
>
> The other is about carrier shift at 100% modulation:
>
>  "9) Carrier shift: 3% or less between 0 and 100% modulation provided
> wire size in point 3 (above) is followed..".
>
> They have got to be kidding!  Of course I know this is assuming
> possibly 24/7 commercial operation at the full KW, but still, #4 wire
> for a 1000 watt tx, PEP of 4000 watts w/100% modulation?
>
> What the heck am I missing here?  My 200 amp mains (as the wire runs)
> to my shack junction box will be about 24 feet max, and then from the
> shack panel to the Gates will be no more than 12 feet.  I plan to run
> #6 to the shack junction box from the 200 amp main, and then
> appropriate size to certain outlets in the shack.  I will likely use
> #8 from the shack box through the wall to a 220 outlet for my Henry 3K
> Classic-X, and #6 to the Gates on separate circuits, but will NEVER
> have both of them going at the same time anyway.
>
> I suspect I will not use a wall outlet for the Gates and simply route
> the #6 wires directly to the primary terminals in the Gates, and use
> the panel breaker for emergency shutoff.
>
> Actually, for this short distance, mains to shack to rigs, I could
> probably get by with #8 so long as I don't run multiple KW rigs at one
> time ;)
>
> 73
> Brian / wa5am
>
> --
> Suburbia is where the developer bulldozes out the trees, then names
> the streets after them. - Bill Vaughan
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