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How tight your make your electrical connections can have a dramatic effect on their resistance. Higher resistance translates into more power dissipating within the connection as electrical current increases.
Manufacturers of electrical equipment often specify a recommended torque value. What happens when you don't achieve this value or exceeded it.
As part of our eFIXX Talk the Torque series, Dr Robert Weller of Electrical Investigations demonstrates how to measure contact resistance and how it changes within the terminals of a consumer unit main switch.
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If you don't use a torque screwdriver you might want to check out the ones we use from Wiha
hub.efixx.co.uk/wiha-torque-se...
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Video Chapters
00:00 Does connector resistance change with torque?
00:15 How can we measure contact resistance?
01:20 Resistance at 1.0 Nm
1:54 What does that equate to as power dissipated?
2:45 Increasing torque what happens to the resistance?
5:00 What happens when a terminal is over torqued?
5:50 Is tighter better?
6:31 Work hardening of copper conductors
7:20 Resistance increasing over time
7:45 Thermal runaway = fires
8:30 Talk the Torque
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Talk the Torque - FREE CPD training module
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❌ This content on this channel is for electrical professionals.❌ ==================================
📹 Presented by
Gary Hayers - Editor eFIXX
with
Dr Robert Weller - Electrical Investigations Ltd
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#efixx #electricians #talkthetorque