As stated in the definitions section of this TP "Electrical Wiring Interconnection System" (EWIS) is defined as follows:
"An electrical connection between two or more points including the associated termination devices (e.g., connectors, terminal blocks, splices) and the necessary means for its installation and identification."
Wires (e.g., wire, cable, coax, databus, feeders, ribbon cable).
The following wires and devices (along with the mating connections at the termination points of the wire on those devices) are not considered part of the "EWIS":
Wiring inside avionics equipment (e.g., flight management system computer, flight data recorder, VHF radio, primary flight display).
Equipment qualified to the standards of RTCA Document DO-160 or shown to be equivalent (other than those specifically included in this definition).
Equipment qualified to a technical standard order (TSO).
Portable, carry on, or otherwise non-permanently mounted (not part of the certification basis) electrical equipment.