A320 ESPM Electrical Standard Practices Manual 4(60)

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R  Case of one terminal of one type and three terminals of another type: 
R  (Ref. Fig. 003, 004) 
R  - two-by-two and back-to-back, 
R  - the three terminals of the same type must be installed adjacent to each 
R  other.The fourth terminal (different type from the others) must be 
R  installed first (at the bottom) or last (at the top).
R  ____________________5. Bending of Terminals 
R  (Ref. Fig. 004) 
R  - Bending of aluminum terminals is prohibited. 
R  - The maximum allowed terminal bending angle for copper terminals is 30. for 
R  10 and 0000 gauge terminals and 45. for 12 to 24 gauge terminals with a 
R  minimum radius of 2 mm (0.0787 in.). 
R  - Copper terminals can only be bent once. 
R  - Spacers must be used: 
R  - when bending of the terminal is prohibited (aluminum terminals), 
R  - whenever more than two terminals facing the same direction are to be 
R  stacked on the same pole. 
R  - Select the thinnest applicable spacer.
R  ______________________________________6. Terminal/Washer/Nut Installation Order 
R  (Ref. Fig. 005) 
R  - A spring washer (ASNA2553) must always be used between the last terminal 
R  and the nut in the following cases: 
R  - stacking of aluminum terminals, 
R  - stacking of aluminum and copper terminals, 
R  - stacking of copper terminals (if the diameter of the stud is equal to or 
R  more than 9.50 mm (0.3740 in.).
R  ____NOTE : If the diameter of the nut is less than 50% of the terminal surface, 
R  a flat washer can be used instead of the spring washer.

 

R Stacking of Terminals - Four-Terminal Installation R Figure 003

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R Stacking of Terminals - Four-Terminal Installation and Bending R Figure 004

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R Stacking of Terminals - Terminal/Washers/Nut Installation Order R Figure 005

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 ______________________________________________
TORQUING PROCEDURE - DESCRIPTION AND OPERATION
 _______1. General
R R R R  _______WARNING : MAKE SURE THAT NO AC OR DC POWER SOURCE IS CONNECTED TO THE AIRCRAFT ELECTRICAL CIRCUITS. THERE IS A RISK OF ELECTROCUTION IF THE AC OR DC POWER STAYS CONNECTED.
R  This chapter gives the general processes to torque the electrical connections on aircraft. 
____NOTE : After the terminal has been torqued, its insulation must be as straight as possible to avoid all contact with any part of the structure or separators. Cable orientation on leaving terminal must be as straight as possible to avoid all contact with any part of the structure or separators and any stress.
 ________2. Material
 The following list is given as an example of the tools and material which can be used. Torque wrench ACRATORK TNS55, TORQUE LEADER, FACOM. Torque screwdriver TORQUE LEADER. Torque identification paint (Material No 07-020).
 ___________3. Preparation
 Before torquing operations, it is recommended to: - Check the quality of the screw: Threads not damaged. - Check the quality of the nut: Do not re-use self-locking nuts. For the other types of nuts, re-using attachment components is possible, pending inspection and authorization, providing the following conditions are met: - The threads and the surfaces in contact are not damaged. - The component protection is not damaged or the surface condition is not impaired. - The original lubrication is restored. - Select the torquing tool compatible with the nut/screw and the torque value (refer to the relevant topic for the item to be torqued). - Check the correct flatness of the lug(s) and the absence of burrs. - Check the correct contact and parallelism of the surfaces of the components to be connected. - Remove the old red identification mark (if painted).

 

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R

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R  __________________________4. Typical Torquing Procedure 
R  (Ref. Fig. 001, 002) 
R 
R  - Assemble the connecting items to be torqued (if necessary, install the 
R  washer). 
R  - Screw the nut/screw manually. 
R  - Hold the connecting cable with one hand to prevent damage (stress on 
R  cable, contact with separator or structure). 
R  - Apply the torque value on the connection assembly with the applicable 
R  torquing tool, in one continuous operation and until the torquing tool is 
　
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