When I was at school, I was charged with relaying the electrickery from one end of a corridor to the stage. I supplied the wire. Single strand 3 core rubber - that I'd got off a dump. It just reached.
I'm surprised you didn't use that sodding awful steel-and-copper phone wire, of which most school CCF Signals sections seemed to have an abundant supply. I dread to think what its resistance per unit length was.
We had a '19 set' and one fine day an RF amplifier plus huge lead acid batteries was delivered from the depths of some stores unit. But no cables to connect the RF amp to the batteries...... So yours truly connected them up using some of that 'Don 10' phone wire; the batteries were filled and charged, the '19 set' fired up, the antenna leads connected.....and finally the RF amp ON/OFF was set to ON. It whirred into life (there was a large electric motor inside it) and we tried a test transmission.
Then noticed the think smoke pouring off the cables......and the familiar Horrible Smell of made-in-the-war electrics getting rather too hot. Fortunately I shut it all down before it went bnag - and went back to using the even more ancient '12 set / R107'......
