----- Original Message -----

From: Dale Rogers

To: Rotary motors in aircraft

Sent: Monday, October 16, 2006 7:45 PM

Subject: [FlyRotary] Re: What size CB or fuses.. EC 2 items..

Dave,

   I'm not saying that you've said anything incorrectly, but you did
leave out a fairly important factor (as well as included a factor
that is often overlooked: length of the wire run.) A wise person
sizes the wire to carry at least 20% more current than the "run"
load of the device(s) it supports.  _Then_ size the breaker to
support the load *potential* of the wire, not the actual load. 
That's how one avoids "false" breaker trips.

Dale R.

In order to properly select the right CB and wire size combination, one must know the acceptable voltage drop for the item being powered.  Also, the amount of power dissipation that is acceptable in the wire (how hot do you want it to get). These concerns are what give me the most grief because they are usually unknown.

 

Wendell