These are all soft metals - over-tightening is one of the things that'll lead to a joint relaxing (as the metal goes past the plastic deformation point and then provides no extra clamping load, but is now mechanically distorted and may not provide even clamping force). This is more of an issue with a cage clamp and the comparatively short tapped threads, plus a sheet metal clamp, compared to a screw in a brass bar which can handle comparatively high loads, although you can still certainly over-tighten and maybe even strip a brass screw or thread. As for using a torque screwdriver: it's consistency. Yes, torques are only good to around 25% tolerance on clamping force in real-world applications (hence TTT and TTY for critical mechanical applications) and yes, some of us develop pretty good "torque wrists" - but none of us has a calibration certificate, and the apprentice with three months' experience probably can't hit 2.5 +/- 1Nm reliably on all 40 screws to do a fairly simple wiring job. Is it that much of a big deal? 99.99% of the time, no. How long does it take an electrician to do up ten thousand screws and have one which *is* a problem? Probably about three months, or less if it's a big job. For the price of a 2.5 and a 5Nm, fixed torque driver, the cost savings associated with never having a "undertorqued or stripped screw" problem are well worth it.

When using multi strand wire I prefer to use ferrules , more reliable as well.😊

Thanks 🦾

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Massive thanks for the support it is very much appreciated 👍🏻

Thanks 👍🏻

7.41mOhms would be a reading of 0.00741Ohms. Your meter giving you a reading of 0.00 is pretty accurate.