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In a message dated 5/27/2001 9:39:43 PM Pacific Daylight Time,
lancair.list@olsusa.com writes:

<< The power to the pressure switches should not come from the hyd pump
 circuit. Those little bity wires wouldn't  be saved by a 50 amp breaker. >>

I will be wiring my hydraulic circuit with a 50 amp breaker whose output side
goes both to the pump and also to a smaller fuse.  The little bitty wires to
the relays are protected by the fuse.  This fuse will protect the wiring to
the relays.  I can't envision a situation where I would want to disable the
pump but keep the relays powered, so one breaker cuts off everything.  The
fuse is needed to protect the little wires going to the relays.  Of course,
the wire from the 50 amp breaker to the fuse has to be a fat one (eventually
I'll run Scott Dahlgren's wiring sizing spreadsheet and quantify "fat").

Why a fuse and not another breaker?  I have a Control Vision power
distribution system mounted to the slanted panel on the old-style 320/360
panel, plus separate breakers for hydraulic pump, pitot heat, and main power
to the power distibution system.  There's no room for a pump relay circuit
breaker, but there is room for a fuse.  It would be aesthetically unpleasing
if I mounted another breaker elsewhere.  Otherwise, a breaker would be fine.

- Rob Wolf
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