In the UK they use a plastic fitting into which you place the wires and screw up. They come in many sizes and in banks of ten. You cut the plastic for the number of connections you need.
use a non contact heat detector. fluke and many others make units that can sense the IR radiation at the terminal and determine the temperature from it.
At the utility I worked at for 35 years they started using sophisticated Infra Red temperature over 10 years ago. This equipment is extremely accurate up to 100 feet and has a screen that you can view in detail where the heat is being developed.It also has a built in camera so any problems can be shown to others.This equipment is used mainly in high voltage electrical substations.
