nuckolls.bob(at)aeroelect
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 Posted: Wed Dec 17, 2014 8:58 am Post subject: Wiring dual fuel pumps to single switch |
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At 10:38 2014-12-17, you wrote:
| Quote: | --> AeroElectric-List message posted by: Charlie England <ceengland7(at)gmail.com>
On 12/17/2014 4:49 AM, carrollcw wrote:
| Quote: | --> AeroElectric-List message posted by: "carrollcw" <carrollswa(at)gmail.com>
Ceengland, if you posted a picture, it's not showing up for me.
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No pic; just a reminder that using one switch means a potential single point of failure for both fuel pumps. Might be acceptably low risk, but should be considered. |
As John mentioned, you can wire a =10 style toggle
switch to offer single pole, three position functionality
as described in chapter 11 of the 'Connection.
Here is one example of this technique.
[img]cid:7.1.0.9.0.20141217104722.01fca940(at)aeroelectric.com.0[/img]
A single-pole, three position, center-off will
work too . . . but this makes the switch different
from all the rest in that OFF is not fully down
but mid-position.
Charlie's question goes to the notion that if
you have two such pumps, then we assume that one
must be operational at all times to keep the engine
running . . . hence a spare pump. If this is
true, then consider the fact that the pump
can fail to work for a host of reasons . . .
broken wire, bad switch, blown fuse, etc.
If one pump circuit goes bad and pops the fuse,
then the single failure may take down both
pumps.
The legacy failure mode effects analysis
suggests that the two pumps are best installed
as totally separate entities with dedicated
switches and power sources.
Bob . . .
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