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What torque settings for accessory screws.

As a newish teacher I am trying to get students to fix things with the correct amount of torque.

Tightening brass screws like they are wheel nuts does not give materials much of a lifespan.

So I bought a couple of torque screwdrivers, so they can quickly get a feel for how tight things should be.

However now I look at data sheets I can't seem to find Torque info for anything smaller than a a miniature circuit breaker.

The data sheets now often include other everyday information like Altitude.

Does anyone have some guidance for smaller brass screw torques, or know of a manufacturer that publishes such data?

Parents
  • Now that you have bought them, you have the opportunity to give your students a feel of what tightening screw terminals is like, with quantitative results for the torque, and qualitative results for the conductors, how squashed they are. You could also put more conductors in the terminal and retest. Using different CSAs. Tabulate the results for clarity, but it is the feel you are really teaching.

    Cross-threading is something I see, and try to avoid, virtually every day. Easy to do with faceplate screws, squeak, squeak. Definitely worth teaching.

Reply
  • Now that you have bought them, you have the opportunity to give your students a feel of what tightening screw terminals is like, with quantitative results for the torque, and qualitative results for the conductors, how squashed they are. You could also put more conductors in the terminal and retest. Using different CSAs. Tabulate the results for clarity, but it is the feel you are really teaching.

    Cross-threading is something I see, and try to avoid, virtually every day. Easy to do with faceplate screws, squeak, squeak. Definitely worth teaching.

Children
  • Cross-threading is something I see, and try to avoid

    More likely with the old-fashioned round terminal boxes with the slits across the terminals - very easy to cross-thread. A torque driver isn't going to save you from that.