Today's Message Index:
----------------------
1. 04:07 AM - automatic switch (GLEN MATEJCEK)
2. 04:31 AM - Re: automatic switch (C&K)
3. 05:36 AM - Re: automatic switch (Robert L. Nuckolls, III)
4. 06:06 AM - Re: automatic switch (Ken Ryan)
Message 1
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| Subject: | automatic switch |
>That's fine, but if it's 'automatic', that implies that it can switch over
>and begin consuming power off the backup(s) whether you're there to 'load
>shed' or not. Just something to think about.
I have been contemplating some of these issues off and on for a while. One
option would be to put all essential loads on one phase of the main panel.
Have adequate wiring to a heavy duty 120v receptacle on a dedicated breaker
on that phase. When the power fails, trip the main breaker and plug a
portable generator into the dedicated receptacle. No load shedding
required, just about as simple as can be, and probably not more than $20 in
parts.
FWIW-
Message 2
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| Subject: | Re: automatic switch |
While these manual schemes work well somebody should mention that they
are illegal almost everywhere due to the risk of back feeding power to
the utility and electrocuting a lineman by mis handling the main
breaker. It happens which is why a double throw main breaker
arrangement is mandated.
Ken
On 24/12/2020 7:01 AM, GLEN MATEJCEK wrote:
> >That's fine, but if it's 'automatic', that implies that it can switch
> over
> >and begin consuming power off the backup(s) whether you're there to 'load
> >shed' or not. Just something to think about.
>
> I have been contemplating some of these issues off and on for a
> while. One option would be to put all essential loads on one phase of
> the main panel. Have adequate wiring to a heavy duty 120v receptacle
> on a dedicated breaker on that phase. When the power fails, trip the
> main breaker and plug a portable generator into the dedicated
> receptacle. No load shedding required, just about as simple as can
> be, and probably not more than $20 in parts.
> FWIW-
Message 3
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| Subject: | Re: automatic switch |
At 06:27 AM 12/24/2020, you wrote:
>
>While these manual schemes work well somebody
>should mention that they are illegal almost
>everywhere due to the risk of back feeding power
>to the utility and electrocuting a lineman by
>mis handling the main breaker.=C2 It happens
>which is why a double throw main breaker arrangement is mandated.
Yup, that's why there is a check-list for
transitions between mains and generator . . .
but failure to disconnect ac mains would
result in immediate operation of the generator's
breakers.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 4
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| Subject: | Re: automatic switch |
The essential loads that I need to run are boiler, unit heater, well pump
and refrigerator/freezer and hangar door. Given that this is at least 90%
of the total amperage and a good percentage of the circuits, I believe
powering the whole building is what makes sense. And I definitely agree
that the system must not allow for feedback to the grid through operator
error.
Ken
On Thu, Dec 24, 2020 at 4:41 AM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 06:27 AM 12/24/2020, you wrote:
>
>
> While these manual schemes work well somebody should mention that they ar
e
> illegal almost everywhere due to the risk of back feeding power to the
> utility and electrocuting a lineman by mis handling the main breaker.=C3
=82 It
> happens which is why a double throw main breaker arrangement is mandated.
>
>
> Yup, that's why there is a check-list for
> transitions between mains and generator . . .
> but failure to disconnect ac mains would
> result in immediate operation of the generator's
> breakers.
>
>
> Bob . . .
>
> Un impeachable logic: George Carlin asked, "If black boxes
> survive crashes, why don't they make the whole airplane
> out of that stuff?"
>
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