I'm helping a friend with an audio installation, and he asked about the requirements for the microphone cable:
"Wiring Requirements: 2 Conductor shielded cable, 22 gauge with a 24 gauge drain wire.
The requirements imply that a 24 gauge drain wire is a necessity, but if the cable is properly shielded, is the drain wire a necessity? Other than providing some additional strength to the cable and/or an easy way to connect to and solder to the grounded shield, does it serve some additional purpose?
It is intended for an unbalanced electret microphone; I'm interested in other uses if not applicable here.