NOTE: The size of the wire barrel of standard butt splices is the same at each end.
Refer to Figure 3.
(1) Find the size of each wire that must have a splice. Refer to the WDM.
(2) Find the conductor material type of each wire that must have a splice. Refer to the WDM and
Subject 20-00-13.
(3) Make a selection of a splice from Table 1, with the first wire to be installed in either end of the
splice and the second wire to be installed in the other end of the splice.
B. Selection of Transitional Butt Splices
Transitional butt splices can be used to attach:
• An aluminum wire to a copper wire
• A larger copper wire to a smaller copper wire.
Table 2
PERMITTED WIRE COMBINATIONS FOR THE TRANSITIONAL BUTT SPLICES
Transitional
Splice
First Wire Second Wire
Size
(AWG)
Type
O.D. of the Wire Insulation
(inch)
Size
(AWG)
Type
O.D. of the Wire Insulation
(inch)
Minimum Maximum Minimum Maximum
277163-1
2 Cu 0.425 0.470 4 Cu 0.276 0.305
1/0 Al 0.425 0.470 4 Cu 0.276 0.305
277164-1
6 Cu 0.276 0.305 8 Cu 0.210 0.255
4 Al 0.276 0.305 8 Cu 0.210 0.255
277165-1
6 Cu 0.276 0.305 4 Cu 0.276 0.305
4 Al 0.276 0.305 4 Cu 0.276 0.305
277168-1
2/0 Cu 0.520 0.645 1/0 Cu 0.430 0.495
3/0 Al 0.520 0.645 1/0 Cu 0.430 0.495
CONFIGURATION OF A STANDARD BUTT SPLICE
Figure 3
ASSEMBLY AND REPAIR OF THE AMP AND BACS52N COPALUM SPLICES
707, 727-787
STANDARD WIRING PRACTICES MANUAL
20-30-13
Page 5
Oct 15/2015D6-54446
ECCN 9E991 BOEING PROPRIETARY - See title page for details
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