[Johnson] AC Circuit Wiring Question

[Dave Maples]

David: If the neutral is bonded to the chassis, then you could have some
ugliness here.  Current code requirements call for neutral and ground to be
isolated everywhere except back at the service disconnect, where they are
required to be bonded together.

I would be inclined to put a 4-wire cord on the beast, and a suitable 4-wire
plug, if you have to operate both 120 VAC and 240 VAC inside the equipment.
Bond ground firmly to the chassis, and float the neutral inside the
equipment.

Thanks,
Dave WB4FUR


-----Original Message-----
From: johnson-bounces at mailman.qth.net
[mailto:johnson-bounces at mailman.qth.net]On Behalf Of David C. Hallam
Sent: Monday, May 28, 2012 10:51 AM
To: Johnson List
Subject: [Johnson] AC Circuit Wiring Question


Not necessarily understanding everything I know, I have a question.  My
Invader 2000 is wired like most other rigs of the 1960's era.  The
neutral of the 240V AC is grounded to the chassis and 120V for the fans,
etc are taken from one side of the line.  I have a 2KVA toroidal medical
isolation transformer.  It can wired for either 1:1 or 2:1.  Would the
use of this transformer eliminate the risk of a hot chassis if anything
should go wrong?

David
KW4DH

--
"Behind closed doors, there is no guarantee that the most basic of
individual freedoms will be preserved.  And as we enter the 21st Century,
the great fear we have for our democracy is the enveloping culture of
government secrecy and the corresponding distrust of the government that
follows."

Senators Daniel Patrick Moynihan and Rob Wyden

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