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



First of all, it is improper to think of L1 and L2 as "phases", they are not
polyphase.  A 230V service is single phase, it is simply fed from a 230VCT
transformer, and the CT is grounded, this is the neutral, and the safety
ground at the panel.  From that point, though, the neutral should never be
thought of as a safety ground, nor should the safety ground be called upon
to carry neutral current.  Older 230V installations such as dryers and
ranges often violated this rule, as they only used three conductors with no
dedicated safety ground.  Dryers do indeed use a neutral,for the motor,
light and timer are usually 115V, only the element is 230V.  Bottom line is,
and I know this is blastphemy, the 30S-1 is poorly designed from a safety
viewpoint, and should have had a conrol transformer for the 115V cicuits, or
have had a four wire service.  Since four wire services were rare in the
days that it was designed, the former should have been included. I rewired
my 30S-1 with a four wire service and isloated the neutral from ground.
73,
Scott
----- Original Message ----- 
From: "William Culpepper" <culpepper@xxxxxxxxxxxxx>
To: <roy.morgan@xxxxxxxx>; <w7ksg@xxxxxxxx>; "Collins Reflector Posting"
<collins@xxxxxxxxxxxxx>
Sent: Wednesday, July 07, 2004 4:56 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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