[Johnson] AC Circuit Wiring Question

[Langston, Mike]

Similar question for A/C welder (buzz box). Socket in garage of a brand new house is 4 wire. Plug on brand new welder is 3 wire. Installed new 3 wire socket and let ground float inside the box. Have I done wrong?

Mike KL7CD

Sent from my iPhone

On May 28, 2012, at 12:38 PM, "Dave Maples" <dsmaples at comcast.net> wrote:

> 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
> 
> --
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