A320 ESPM Electrical Standard Practices Manual 4(66)

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R R  ____NOTE : The first wrap and the last wrap must have a 100% overlap. The other wraps must have a 50% overlap.
 - Attach the two ends of the tape with cable ties NSA935401. (Ref. Fig. 004) - Install all the removed cable ties.
 ________________________3. Clamps Sliding on Struts
R R  A. General This paragraph gives the procedure for the reinstallation of bundle attachment clamps or large or tapered struts. Always do this procedure when you find deterioration of the initial installation (loose clamp, deterioration at the tape and/or grommet).
R R  ____NOTE : This process is not applicable inside fuel tanks. 
R R  B. Procedure (Ref. Fig. 005) - Remove the clamp assembly (the strut clamp and the bundle clamp) and the existing tape from the strut. - Remove the remaining traces of glue on the strut with cleaning agent (Material No.11-008A, 11-026 or equivalent). - Install self adhesive tape ASNA5107 on the strut.
R R  ____NOTE : Pull firmly on the tape and wrap it around the strut. 

 

 Check for ageing - Installation of Bundle Attachment
 Figure 003

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R

 Check for ageing - Overlength Storage Loop
 Figure 004

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R

 Check for ageing - Clamp Installation
 Figure 005

 

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 -Attach the two ends of the tape with cable ties NSA935401-08 or equivalent.
 -
Install a strut clamp that has an internal diameter slightly smaller than the outer diameter of the strut + tape.

 -
Install the bundle clamp.

 

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R  _________________________________________

 

4. Clamps at the end of Convoluted Conduits.
R This chapter gives the correspondence between NSA935807 and NSA5516 clamps. We recommend the installation of NSA5516 grommet clamps as an alternative to NSA935805 metal clamps at the end of convoluted conduits. The grommet prevents contact between the wires and the metal part of the clamp if the conduit moves out of the clamp. (Ref. Fig. 006)
 _______

CAUTION : MAKE SURE THAT YOU USE THE TYPE OF CABLE SUPPORT THAT IS APPLICABLE FOR THE AREA IN WHICH YOU INSTALL IT. ALWAYS REFER TO CHAPTER 20-33-XX TO KNOW THE FULL PN OF THE CABLE SUPPORT APPLICABLE FOR ITS ENVIRONMENT ON THE AIRCRAFT. IF YOU DO NOT USE THE CORRECT TYPE AND SIZE OF CABLE SUPPORT, DAMAGE TO THE CABLE BUNDLE CAN OCCUR.

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 Check for ageing - Alternative Clamps
 Figure 006

 

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 ____________________________________________
ELECTRICAL TESTS - DESCRIPTION AND OPERATION
 _______

1. General
 This chapter gives general electrical Tests.
R ________________________
2. Structure of the Chapter
 A. Continuity Test (Ref.20-52-21)
 B. Tests for Short Circuit (Ref.20-52-22)
 C. Reflectometry Test (Ref.20-52-23)
 D. Insulation Test (Ref.20-52-24).

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 ____________________________________________CONTINUITY TESTS - DESCRIPTION AND OPERATION
 __________________1. Reason for the Job
 _______WARNING : BE CAREFUL WHEN YOU USE ELECTRIC TOOLS IN AREAS WHERE THERE ARE RISKS OF EXPLOSION (FUEL TANKS, FUEL VAPOUR AREAS, ETC.). REFER TO YOUR LOCAL REGULATIONS AND MAKE SURE THAT YOU OBEY THEM. SOME ELECTRIC TOOLS SUCH AS HEAT GUNS, SOLDERING IRONS AND TOOLS WITHOUT INTRINSIC PROTECTION ARE NOT PERMITTED IN THESE AREAS.
 The following procedure does not replace trouble shooting. It only provides general test methods to be applied on aircraft.
 ______________________2. Job Set-Up Information
 A. Fixture, Tools, Test and Support Equipment
R  ------------------------------------------------------------------REFERENCE QTY DESIGNATION ------------------------------------------------------------------No Specific Ohmmeter
R R R  ____NOTE : For a continuity test in the fuel tanks, use an intrinsic safety ohmmeter (For example: Ohmmeter CULTON type 278, AVTRON T477W or equivalent)
 __________3. Job Set-Up (Ref. Fig. 001) 
R  A. Ohmmeter Check Before you start the continuity test: 
R  (1) Make sure that the ohmmeter operates correctly. Make sure that the extension wires (if used) are in the correct condition. (Ref. Fig. 001) 
R  (2) Adjust the ohmmeter to show zero Ohm with the two probes in contact.
 B. Voltage and Current Values for the Test. Use these voltage values:
 (1) For circuits with conductors connected directly via standard electrical connections (connectors, modules, etc ...): - 0.1 A less than or equal to I less than or equal to 2 A with U = 28 VDC max.
　
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