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



Scott:

The 30S-1 was correctly designed within the standards of that day.

"Older 230V installations such as dryers and ranges often violated this
rule, as they only used three conductors with no
dedicated safety ground."

True, there may not have been a "dedicated safety ground", but there was no
"rule" violated.  What was designed, and done, was according to the National
Electrical Code in force at the time.  The NEC is re-issued every three
years, and, trust me, there ARE changes as time goes on.  The reason the
Code is changed is because technology changes, but also because better ideas
come along.  Four-wire systems were one of those things that were better
ideas.


Kent W5TXV


----- Original Message ----- 
From: "Scott Johnson" <scottjohnson1@xxxxxxx>
To: <culpepper@xxxxxxxxxxxxx>; <roy.morgan@xxxxxxxx>; <w7ksg@xxxxxxxx>;
"Collins Reflector Posting" <collins@xxxxxxxxxxxxx>
Sent: Wednesday, July 07, 2004 8:35 PM
Subject: {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
> >
> >
> > Sponsored by the Collins Collectors Association
> http://www.collinsradio.org
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>
> Sponsored by the Collins Collectors Association
http://www.collinsradio.org
> 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
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>
>


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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)
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