Reading some forum discussions around loose electrical connections, it is obvious there are two camps of thoughts: one promotes regular retorquing or retightening of the wire terminals, while the other calls for thermal imaging.
But I guess the question is not even about retightening or thermal imaging of wire terminals …
Loose electrical connection is definitely a big risk, and if not avoided or detected will result in over-heating, internal arc or fire inside electrical equipment. How to avoid such hazards?
On one hand, regular retorquing of screw terminals could create overtorquing conditions, worsening the condition of the electrical connection.
And on the other hand, thermal imaging requires dedicated skills and tools, and could have anomalies or impossibilities: all electrical apparatus have to be operational and at the nominal load, and accessing measurement points could bring safety issues.
But why to try to eliminate the consequences and not the root causes?
The best, in my opinion, is to eliminate the root causes and it is possible to do so by using devices with maintenance free terminals (spring cage or cage clamp types).
I really wonder why this type of wire terminals is not more regularly used. What do you think?
As a designer, do you generally specify the use of spring cage terminals in your tender specifications?
And if not, why?