Ground and Neutral are the same in the MAIN breaker box - not necessarily in
all breaker boxes... A branch circuit (probably quite common for
post-construction install of 240V in our shacks) must have the neutral and
ground separated. You should not wire up a device anywhere which requires
neutral (i.e. the neutral is carrying current) to the ground instead of
neutral.
A slight digression: Ground-fault and arc-fault breakers rely on separate
ground and neutral - or stated differently, they rely on current NOT being
returned on the ground. I would recommend that our shack and workshop
branch circuits all be fed by a ground-fault breaker. I feel better knowing
that a milliamp difference in the load between hot and neutral will likely
trip the breaker rather than a 40A overload running up my arm and out to the
frame of a piece of radio junque.
~~~~~~~~~~~~~~~~
Bill Coleman N2BC
http://home.stny.rr.com/n2bc
----- Original Message -----
From: "Richard" <2@mail.vcnet.com>
To: "Gary Schafer" <garyschafer@attbi.com>
Cc: "Steve Katz" <stevek@jmr.com>; <RMead100@aol.com>; "AMPS"
<amps@contesting.com>
Sent: Friday, March 08, 2002 7:02 AM
Subject: Re: [Amps] Source for 220V cords
>
>
>Richard wrote:
>
>> >A window air conditioner cord is what you want. They have a molded plug
on
>> >them,
>> >although they are not usually all that long. Can be found in Home Depot,
>> >Lows or
>> >probably most larger hardware stores.
>> >
>> >By the way I think that a 15 amp 220 plug has one blade turned 90
degrees
>and
>> >the 20 amp plug has both blades 90 degrees from what a standard 120 volt
>plug
>> >would be.
>> >These are all 3 wire plugs. 2 hot and ground. No neutral connection. I
think
>> >that the SB220 will run without the neutral on 220 vac.
>> >
>> Do this and the chassis is not returned to mains neutral/gnd at the
>> breaker box.
>>
>> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
>> www.vcnet.com/measures.
>> end
>
>I am not sure about the SB220 but the SB200 does not require a neutral
connection
>on 220 volts. The fan is the only 120 volt item in the amp. It gets
connected
from
>one hot side to the center connection of the transformer primary. This acts
as an
>auto transformer to give 120 volts for the fan.
? True. Gary. Also, green/ground and white/neutral are the same point
in the breaker box.
>The chassis ground still goes to
>the green wire (center pin) as it did with the 120 volt connection. No
neutral
>connection is needed as there is no 120 volts as far as the line is
>concerned.
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
end
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