[Elecraft] 240V Line

[Jim Brown]

On Wed,12/24/2014 11:41 AM, Charlie T, K3ICH wrote:
> A lot of the older amps (Thunderbolt for example) had 120 V fans wired 
> from one hot to ground. I always wondered about that. 

I think that used to be legal, but it is no longer, and it's very bad 
practice.

The better ones (Ten Tec Titan, for example) run a 120V fan between one 
side of the power transfomer primary and the center tap. It is now 
illegal for the Green wire to carry load current.

On Wed,12/24/2014 11:13 AM, Phil Kane wrote:
> IIRC the latest code update now requires the separate neutral ("white
> wire") to be run in all 240V circuits.  I did that in a 1969 when I
> finished the basement in a year-old home!

You may be confusing a 120/240 outlet that has a four circuit plug 
(phase, phase, neutral, and Green) and can serve both 120V and 240V 
loads, with a 240V outlet that has a three circuit plug and serves only 
240V loads. There is no neutral in a 240V outlet, and as noted above, it 
is illegal to connect a 120V load between one phase and the Green wire 
(Equipment Ground).  That 120/240 circuit can feed both 120V and 240V 
outlets. A neutral IS required to feed those 120V outlets.

73, Jim K9YC