... and less satisfactory
general purpose tools like this: https://www.amazon.com/IWISS-Terminal-Crimping-6-50mm%C2%B2-Electrician/dp/B017S9EINA/ref=cm_cr_arp_d_product_top?ie=UTF8
...
...
https://s3vi.ndc.nasa.gov/ssri-kb/static/resources/nasa-std-8739.4a.pdf
The pull test values are on page 54. Detailed operating instructions
come with the crimping tool.
...
I'd appreciate fine detail on crimp connectors for "mains" electrics[... crimper links]
in a home.> Example - a "straight-through" connector looks something
like this
\___________/
___________
/ \
to connect wires which go like this
__ ___
__|====== ======|___
I got offcuts of Earthing cable and crimped them together and tried
pulling them apart.
I found that if you get the crimp tool "snug" up against flare of the
outer end of the crimp-fitting the result is so strong you cannot
feasibly pull the crimped cables apart.
Whereas if you clamp the crimp tool anywhere at the 1/4-length you can[...]
pull the assembly apart.
This is about the UK.
Voltage 230V (r.m.s.) 50Hz AC.
Regulation of electrical systems in and around buildings in the UK is
known as "18th Edition". Which is also British Standard BS7671.
It is very much more like an American "Code" (eg "ASME9", "AWS D1.1")
rather than in ISO. Has developed in an evolutionary way over
something like 140 years ("first edition" was in the 1880's).
I'm talking about - one end of the cable in a vice, put a vice-grip / >locking-pliers on the cable and welt the locking-pliers with a copper<snip>
mallet until the cable is a mess but the crimp hasn't let-go.
Much more force than this polite requirement.
I'd appreciate fine detail on crimp connectors for "mains" electrics[... crimper links]
in a home.> Example - a "straight-through" connector looks something
like this
\___________/
___________
/ \
to connect wires which go like this
__ ___
__|====== ======|___
I got offcuts of Earthing cable and crimped them together and tried
pulling them apart.
I found that if you get the crimp tool "snug" up against flare of the
outer end of the crimp-fitting the result is so strong you cannot
feasibly pull the crimped cables apart.
Whereas if you clamp the crimp tool anywhere at the 1/4-length you can[...]
pull the assembly apart.
This is about the UK.
Voltage 230V (r.m.s.) 50Hz AC.
Regulation of electrical systems in and around buildings in the UK is
known as "18th Edition". Which is also British Standard BS7671.
It is very much more like an American "Code" (eg "ASME9", "AWS D1.1")
rather than in ISO. Has developed in an evolutionary way over
something like 140 years ("first edition" was in the 1880's).
...
In the amateur radio requirements for lightning grounds this is the acceptable copper splice:
https://waterwelders.com/what-is-cad-welding/
Although this strongly recommends against gas welding it suggests that
it is still allowed to join copper grounds: https://www.britsafe.org/publications/safety-management-magazine/safety-management-magazine/2019/down-to-earth/
You may be heading toward a situation where only illegal immigrants
can perform dangerous tasks, like yours.
"Richard Smith" wrote in message news:lyfs38ajzy.fsf@void.com...
Pull-out test:
I'm talking about - one end of the cable in a vice, put a vice-grip / locking-pliers on the cable and welt the locking-pliers with a copper
mallet until the cable is a mess but the crimp hasn't let-go.
Much more force than this polite requirement.
----------------------------
That test to destruction will prove your equipment and methods but
isn't for checking each connection before installing it. The 'polite'
pull test checks for crimps that didn't pressure-weld together. The
wire should have a nearby strain relief clamp that protects the
connection from being pulled apart during further installation or
remodeling.
"Richard Smith" wrote in message news:lyfs38ajzy.fsf@void.com...
Pull-out test:
I'm talking about - one end of the cable in a vice, put a vice-grip / locking-pliers on the cable and welt the locking-pliers with a copper
mallet until the cable is a mess but the crimp hasn't let-go.
Much more force than this polite requirement.
----------------------------
That test to destruction will prove your equipment and methods but
isn't for checking each connection before installing it. The 'polite'
pull test checks for crimps that didn't pressure-weld together. The
wire should have a nearby strain relief clamp that protects the
connection from being pulled apart during further installation or
remodeling.
I have
experience here, I've struggled to teach actors how to build scenery and >intelligent Mensans how to paddle a canoe. Hardly any could learn to tie a >bowline. The actors felt such work was beneath them when really it was >beyond them.
wire rope splice strength. This type failed: >https://www.homedepot.com/p/Everbilt-3-16-in-Zinc-Plated-Flush-Type-Wire-Rope-Clamp-2-Pack-42984/205883072
wire rope splice strength. This type failed: >https://www.homedepot.com/p/Everbilt-3-16-in-Zinc-Plated-Flush-Type-Wire-Rope-Clamp-2-Pack-42984/205883072
IIRC it slipped at around 100#. I had tightened it by hand in the woods, it >might grip better if tightened with an impact driver, or a cap screw >substituted. They could be useful to drag an eye splice over a high branch >or minimize the fumbling of installing Crosby clamps and thimbles.
"Richard Smith" wrote in message news:ly4jjo80kf.fsf@void.com...
People get mesmerised by the minimum acceptance criterion/criteria, to
the exclusion of all other.
Sign of a "service economy / managerial / post-industrial world" ?
------------------------
I've come to believe that acceptance criteria can be valid if written by people with both theoretical and practical knowledge, but they may
prefer to avoid working in a bureaucracy, leaving neurotic paper-pushing staffers with literary degrees to formulate them from incomplete written sources. Mitre was an attempt to isolate scientists and engineers
working on government projects from its bureaucracy. Yesterday a very hands-on and disgusted municipal employee and I were discussing how the bureaucracy is a welfare refuge for managers whose emotional dysfunction keeps them from working commercially.
Like you my combination of knowledge and practical skills provokes envy
and resentment from those who consider themselves inherently superior
because it feels good, like the aristos of the Ancien Regime and today's leftists.
Much of the Internet ad copy for high tech products and new developments appears to come from writers who don't comprehend the subject beyond
quoting what they think they were told, and may lack the practical
ability to change a light bulb or tie their shoelaces. Look at the
insulting comments on the writer's incompetence that follow Yahoo high
tech articles. I have experience here, I've struggled to teach actors
how to build scenery and intelligent Mensans how to paddle a canoe.
Hardly any could learn to tie a bowline. The actors felt such work was beneath them when really it was beyond them.
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