To clarify my use of cat-5: I bought Brewer's Hardware sensors which are the One-Wire sensor sealed in a stainless steal 1/4 tube with three feet of four strand wire. I used the cat-5 to extend the cable. It never sees close to 200F. I assure that the cable Brewer's Hardware is temp rated appropriately, but never thought to check.
About the cat-5 twisted pair. I use three different pair for signal, power, and ground. I float the twisted partner for signal and power, but ground both wires in the pair for ground of the sensor.
I read the Maxim sheet about not using a star point configuration. My first setup I ran from sensor to sensor in one daisy chained network. When I had issues polling each sensors serially w a 750ms delay between the "calc temp" and "get temp" commands, I stated experimenting both with my code and there hardware configuration.
I stopped tinkering when I could poll all four sensors in less than 2 sec while they were in a star point configuration. I send the "calc temp" command to all four addresses, wait 1.6 sec, and then send the "report temp" command.
I agree that this might not be the optimum arrangement, but when I reached this point I stopped having measurement issues.
Sorry if I took OP thread too far off track.