Crimps inside the CU

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Crimps inside the CU

Discuss Crimps inside the CU in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

I have seen a lot of crimps fail due to improper use of tools and the incorrect amount of conductor showing. When working on london underground trains we had so many fail that we had to strip an exact amount on the cable and use calibrated crimping tools!
 
Overcrimping is caused when you have an adjustable set and deliberately set crimp to a lower lug size assumably the thought on this is to get a tighter crimp, it valleys a circular crimp into a u-shape and can weaken the structure of the crimp itself, yes im a bit of a perfectionist i suppose but im not to NASA's standards as solid cores and tinned strandeds are a big NO! NO! ....

Have a browse at this regulation crimping guide for NASA .... check all the none complying crimpings further down the page and you thought i was picky ;)
CRIMPED TERMINATIONS GENERAL REQUIREMENTS
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cogsey133 said:
I have seen a lot of crimps fail due to improper use of tools and the incorrect amount of conductor showing. When working on london underground trains we had so many fail that we had to strip an exact amount on the cable and use calibrated crimping tools!
Click to expand...

Aye ... well that's why aahh aalways SOLDER mine lyke ... ye cannit beat a propa soldered joint.
 
cogsey133 said:
I have seen a lot of crimps fail due to improper use of tools and the incorrect amount of conductor showing. When working on london underground trains we had so many fail that we had to strip an exact amount on the cable and use calibrated crimping tools!
Click to expand...

These are the major causes of failures. All too often even a good crimping tool in the hands of a novice adds up to a good many crimp failures... lol!!!
 
darkwood said:
Overcrimping is caused when you have an adjustable set and deliberately set crimp to a lower lug size assumably the thought on this is to get a tighter crimp, it valleys a circular crimp into a u-shape and can weaken the structure of the crimp itself, yes im a bit of a perfectionist i suppose but im not to NASA's standards as solid cores and tinned strandeds are a big NO! NO! ....

Have a browse at this regulation crimping guide for NASA .... check all the none complying crimpings further down the page and you thought i was picky ;)
CRIMPED TERMINATIONS GENERAL REQUIREMENTS

.
Click to expand...

Darkwood, your now talking about very specialised installations now, that are far, far outside any of our requirements!! lol!!!

Exactly as i stated above, but that is always down to the failure of the operator not the crimp lug or the crimping tool....
 
Geordie Spark said:
What make ye think that lyke??? :eek:mg_smile:
Click to expand...

Because NASA says so and i tend to rely more on engineers and scientists who have had a trillion budget to engineer vehicles that take us all around the solar system in extremes of conditions than the lesser budget of the floor guy at B & Q trying to sell his stock of solder.... Read this ...

>CRIMPED TERMINATIONS GENERAL REQUIREMENTS
 
darkwood said:
Because NASA says so and i tend to rely more on engineers and scientists who have had a trillion budget to engineer vehicles that take us all around the solar system in extremes of conditions than the lesser budget of the floor guy at B & Q trying to sell his stock of solder.... Read this ...

>CRIMPED TERMINATIONS GENERAL REQUIREMENTS
Click to expand...

Aye well .......... I do it Geordie & Robert Stephenson's way ... they built a rocket long before them Americans had even thought of it !!!!
 
darkwood said:
Because NASA says so and i tend to rely more on engineers and scientists who have had a trillion budget to engineer vehicles that take us all around the solar system in extremes of conditions than the lesser budget of the floor guy at B & Q trying to sell his stock of solder.... Read this ...

>CRIMPED TERMINATIONS GENERAL REQUIREMENTS
Click to expand...

Come on guys and dolls. Comparing domestic LV installations with NASA's take on the matter of crimps is nugatory in my view. I have a military background and by way of example, crimps in aircraft armament systems are a complee no, no. But we are not talking about NASA; and we are not talking about circuits for nuclear weapon systems we are talking about inline connectors in a domestic LV atallation.
 
I know sefton he only asked why i thought solder was less reliable than crimping so i dragged the big boys in to back me up lol
 
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