The approach to E3 cabling design depends primarily upon the requirements of the aerospace system, and on the standard corporate practices used in developing a unique competitive position. As such it is not appropriate to provide a "Best Practices" cookbook solution to E3 cabling in an attempt to standardize all aircraft with the same cabling schemes.
Military Standards provide guidance for standardization where required. The "Best E3 Practices" should not be used to replace or duplicate those standards. It is important, however, to assure that the best E3 cabling practices are incorporated into all modern aerospace systems. Accordingly, the emphasis in this document is upon process rather than standardization and individual technique.
To assist in the E3 cabling process, the following checklist is provided which incorporates the concepts described in this document. Some of the steps in this checklist can be easily integrated as part of the overall E3 program from early planning to final acceptance testing. They are identified here as they apply to cabling.
1. DETERMINE ELECTROMAGNETIC ENVIRONMENT FOR AIRCRAFT CABLING ESTABLISH AN ESTIMATED SPECTRUM PLOT OF:
 Inter-system electromagnetic environment including operational mission environment
 Intra-system electromagnetic environment including operational mission environment
2. IDENTIFY POTENTIALLY SENSITIVE INTERFACE CABLES AND WIRES
 Analog Signal
 Filtered DC
 Flight Controls
 Other (List Separately)
3. IDENTIFY ALL CABLES THAT MIGHT RADIATE ENERGY TO OTHER CABLES
 High Power
 Other (List Separately)
4. ESTABLISH E3 CATEGORIES THAT PROVIDE FOR REQUIREMENTS OF THE SYSTEM AND THE INDIVIDUAL SUBSYSTEMS AND EQUIPMENT
 Establish optimum wire categories considering both the wire functions and the time available to sort out interference problems
5. SELECT CABLE TYPES BASED UPON REQUIREMENTS FOR SIGNAL LEVELS, CHACTERISTIC IMPEDANCE, SHIELDING REQUIREMENTS AND PHYSICAL ENVIRONMENT
(A) Specify shield requirements:
 Percent of coverage
 Type of shield
 Single or double
 Woven braid
(B) Type of shield termination:
 360 degree peripheral
 Pigtails and maximum length
 Type of backshells
(C) Terminate the outer overall shield of a cable penetrating a bulkhead at the bulkhead
(D) Specify where cables are to be bonded to ground.
 if a cable is electrically long (greater than one quarter wavelength), ground the overall shield at both ends and every quarter wavelength along the cable to inhibit induced potential on the shield.
 If a cable is electrically short (less than one quarter wavelength), ground the overall shield at one end only to inhibit induced currents.
6. IDENTIFY INCOMPATIBILITY BETWEEN AIRPLANE WIRING AND MISSION WIRING; PROPOSE APPROPRIATE REWORK
7. ESTABLISH AN INITIAL ROUTING SCHEME AND IDENTIFY POTENTIAL PROBLEMS IN SEGREGATION, SEPARATIONs AND SHIELDING
8. ADDRESS MAINTAINABILITY AND PRODUCIBILITY
9. INSTITUTIONALIZE E3 CATEGORIES WITHIN THE CABLE IDENTIFICATION CODING
NOTE: Institutionalization is required so manufacturing engineering, installation and maintenance personnel will always know to check the E3 categories. In the past, many of these cables were handled as exceptions. When handled as exceptions to rules, some E3 cables often lose their identity, which contributes to the onset of inadvertent cable problems.
10. MONITOR MANUFACTURING AND INSTALLATION
(A) Communicate best practices and requirements to manufacturing personnel.
 Form a product design team. This is an efficient means to communicate best practices to those who must implement them and keep EMC "in the loop" throughout all phases of the program.
 Inspect; be sure all identified design features are reflected in manufacturing and installation drawings.
 Work closely with quality assurance; form a list of critical items they should carefully check.
(B) Verify the implementation of best practices.
 Roam the factory; watch installation; look for compromised segregation or separation; examine routing for difficulties.
 Call out shield impedance measurements and bond checks in installation drawings and personally witness the tests.
 Work closely with planning and quality assurance to verify critical requirements.