Carl is exactly right about this. 240VAC plate transformers often have
center-tapped primary windings, or else two 120VAC windings in series.
It's okay to connect 120V circuits from either L1 or L2 of the AC line
and the center tap of the primary. In effect the center tap is a kind of
virtual "neutral." It's never okay to connect one side of a 120V load to
the chassis ground, although that was frequently done in the old days,
before independent Neutral lines were mandated by electrical codes.
Neutral should never be tied to ground, except at the service entrance
of the house.
73,
Jim W8ZR
On 3/20/2017 3:17 PM, Jim Brown wrote:
On Mon,3/20/2017 2:04 PM, Carl wrote:
Yes, remember that it's perfectly OK to run a 120V load between one
side of the TX primary and its center tap. This is often done by the
first rate amp mfrs. And remember that it is NOT OK (and is illegal)
to run a 120V load between one side of the line and ground. Indeed,
putting load current on ground is a recipe for hum pickup. And
bonding neutral to ground is even worse.
73, Jim K9YC
Except those high enders that went to ground
I don't understand what you mean, Carl.
73, Jim
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