{Collins} Re: 30S-1 230V wiring



William:

You're right on target.  I started to say you're dead on, but that might be
misinterpreted.

The four-prong approach is the safer of the two.


Kent  W5TXV


----- Original Message ----- 
From: "William Culpepper" <culpepper@xxxxxxxxxxxxx>
To: <roy.morgan@xxxxxxxx>; <w7ksg@xxxxxxxx>; "Collins Reflector Posting"
<collins@xxxxxxxxxxxxx>
Sent: Wednesday, July 07, 2004 6:56 PM
Subject: {Collins} Re: 30S-1 230V wiring


> I wrote this prior to seeing the message from Bob, WB4TGG, and he covered
> much of the 30S-1 230 volt thing, but since I have already written this, I
> will send it anyway.
>
> A clothes dryer is a 230 volt device.  It does not use 115 volts, and the
> three wires consist of two wires that supply 230 volts and a non-current
> carrying ground wire for a safety ground.
>
> The 30S-1 uses 230 volts for the plate transformer and 115 volts for
> filament transformers, bias transformers, blower motors, time delay
relays,
> etc.  Therefore it must have a current carrying neutral to supply the 115
> volts.
>
> To meet the current National Electrical Code, the 30S-1 must NOT have the
> neutral conductor connected to the chassis. (I do not have a 30S-1, but I
do
> have a schematic of unknown date, and the neutral is not shown as being
> connected to the chassis.)   The ground wire (the green wire) is connected
> to the chassis/cabinet, and it must be a separate conductor all the way
back
> to the ground buss in the breaker panel.  And, the 30S-1 must have a four
> prong plug to meet the current code.  (It MIGHT meet some provision of the
> code if it has a separate ground wire from the "ground" connection on the
> amplifier to a "real" ground, and this is obviously what The Collins Radio
> Company intended, but I would prefer the four prong plug with green wire
> back to the panel.)  The power cord meeting the current code will have
four
> wires - two wires carrying 230 volts, usually black and red; a white
neutral
> and a green ground wire.
>
> I might not have read all of this thread, and I apologize if I am
repeating
> someone before me, but I believe the National Electrical Code was changed
> between the time the first and last 30S-1 was manufactured.  If the
> amplifier was manufactured prior to the code change, it is probably
> "grandfathered" in, but that won't help you if you get electrocuted with
it,
> which is not very likely, but the Code was changed to require a separate
> ground for a good reason.  If you don't understand it, get competent help.
>
> I do not consider myself competent on the Code, and I solicit a critique
of
> the above from anyone who disagrees with anything I have said.
>
> William
> W4BZ
>
>
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Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
1st Wed (of the month) AM Net 3.880 Mc-2000 local (ET, CT, MT, PT)
Sun AM Net: 29.050 Mc-1200 Central






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