Boeing 707 - Applicable Conditions; Assembly of a Conductor Splice with a Conductor that Is Folded Back; Increase of Conductor Cau

Table 4 AWG TO CAU CONVERSION (Continued)
Wire Size
(AWG)
Circular Area Units
(CAU)
12 59
10 99
8 170
6 268
4 426
2 665
1 837
1/0 1045
2/0 1330
3/0 1665
4/0 2109
• Find the CAU of each conductor. Refer to Table 4.
• For more than one conductor, add the CAU of each conductor for the total CAU of the
conductors.
2. INCREASE OF CONDUCTOR CAU
A. Applicable Conditions
If the total CAU of the conductors is less than the minimum CAU of the conductor splice, increase the
CAU of the conductor.
For example, an AWG 20 wire can be assembled in a size 12-10 NAS1388 butt splice, but the CAU of
the AWG 20 conductor must be increased by a minimum of 31 CAU and a maximum of 126 CAU
because:
• The CAU of the AWG 20 conductor is 12
• The minimum CAU of the size 12-10 splice is 43
• The maximum CAU of the size 12-10 splice is 138.
Refer to:
• Paragraph 2.B. for the assembly of a conductor splice with a conductor that is folded back
• Paragraph 2.C. for the assembly of a conductor splice with a filler wire.
B. Assembly of a Conductor Splice with a Conductor that is Folded Back
(1) Find the correct insulation removal length L for the conductor splice.
(2) Remove two times the removal length L of the insulation from the end of the wire.
CAUTION
DO NOT CUT OR CAUSE DAMAGE TO THE STRANDS OF THE
CONDUCTOR. THE MECHANICAL STRENGTH OF THE WIRE CAN BE
DECREASED.
ASSEMBLY OF SPLICES
707, 727-787
STANDARD WIRING PRACTICES MANUAL
20-30-12
Page 12
Oct 15/2017D6-54446
ECCN 9E991 BOEING PROPRIETARY - See title page for details