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  #11  
Old 01-21-2014, 01:42 PM
Lucio I-NLCM's Avatar
Lucio I-NLCM Lucio I-NLCM is offline
 
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Location: Milano Italy
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thanks Walt; Mark;
the 43.13 is a big circular, I'll need time to study and well comply , the chapter 11 section 2 mentioned, is about "Storage Batteries"
But I found in the section 5 a source for cable current capacity, in fig 11-9 the 8 awg carry 38 A @ 105 ?C , far from 60A .... or I'm wrong?

thanks Mich;
I read the AeroElectric discussion about ANL-Midi , now I start to think about a conventional Bussmann ANL
but I'm not sure about do not protect the cable that feed the main bus
may be I'll need more learning on the text .

thanks a lot at all other guys not mentioned
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  #12  
Old 01-21-2014, 02:30 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
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Lucio,
Even though an alternator may be rated at 60 amps, the actual current is determined by the load. If you anticipate a continuous load of 60 amps, then go with larger wire. Unless you have pitot heat and heated seats and high current lighting, then chances are that the normal load will be less than 20 amps with occasional 10 amps more to charge the battery after starting. #8 wire is good enough for most small planes. Do not consider intermittent loads for sizing wire. Flap motors, com transmitters, landing gear do not need to be considered because they are not continuous and will not heat the wire for the short time that they are operated.
Joe Gores
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  #13  
Old 01-22-2014, 01:27 AM
Lucio I-NLCM's Avatar
Lucio I-NLCM Lucio I-NLCM is offline
 
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Mich
Now everything sound better for my acknowledge ; so in this think I can disregard the mere stuff TOTAL load sum

Here the list @ max load
SV efis 3.5A (enclosed beck up battery) 5A*
Intercom 0.1A*
AP Servos 2.7A
Trim Servos 1.5A
Boost Fuel pump 4.5A (in the pattern)
Flap motor 3A
Becker Com 4A
Strob light 7A*
Nav light 6A*
Panel light 1A*
Landing light 100w 8A
TXP 3A*
Cigar power 2A*
--------------------
TOTAL about 48A

SO , considering just the continuos * load my feed need drop down at 30A or under 20A with lights off
We'll done Mich, thanks

...... The planets are aligning

Lucio
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