Whia Torque Screwdriver

[trypod]

Regulation 134.1.1 of BS 7671:2008 states:
Good workmanship by competent
persons or persons under their
supervision and proper materials shall
be used in the erection of the electrical
installation. Electrical equipment shall
be installed in accordance with the
instructions provided by the
manufacturer on the equipment.

 

[vernam616]

How well do you think that above statement/regulation would hold up in a court of law when defending yourself against manslaughter when you have burned someones house down with kids in it?

"well i torqued it up and realised i could get a few more turns with a normal driver, but left it hoping it would be ok "

You will end up "dropping anchors in pooh bay " (prison time)

 

[netblindpaul]

How well do you think that above statement/regulation would hold up in a court of law when defending yourself against manslaughter when you have burned someones house down with kids in it?

"well i torqued it up and realised i could get a few more turns with a normal driver, but left it hoping it would be ok "

You will end up "dropping anchors in pooh bay " (prison time)

So which is right?
The manufacturers stated torque settings, or, as tight as you can do it?...

 

[ruston]

How many manufactures actually state max torque settings on boards and accessories. I think it is a commonsense thing. It is possible for a torque wrench to be satisfied and not achieve the set torque in some circumstances, especially at lower settings. IE corrosion on threads or dirt etc.

 

[netblindpaul]

How many manufactures actually state max torque settings on boards and accessories. I think it is a commonsense thing. It is possible for a torque wrench to be satisfied and not achieve the set torque in some circumstances, especially at lower settings. IE corrosion on threads or dirt etc.

There is a lot more to bolted joints than that ruston, however, you are quite correct in your comments!

Note the ellipsis in my post...

 

[ruston]

Yes I know there is ,I have worked in engineering since I were a lad lol . Most of us manage not to burn the place down.

 

[netblindpaul]

Yes rushton I realise that, however, we now have some conflicting requirements don't we.
One says we must use manuf torque settings the other says we must be competent, and in doing so we realise that in certain situations these values may be of no use...
DOH!

 

[ruston]

Yes I agree with you.Just a bit of buck passing and money making.

 

[telectrix]

to add to the confusion, mayt i say that on numerous occasions, i have tightened tails in CUs as tight as seemed reasonable without stripping threads. 10 minutes later, i can then get another half turn to a full turn on the terminals.

 

[moondog]

I'll 2nd that,was always told to recheck connections,

 

[TheFishmonger]

to add to the confusion, mayt i say that on numerous occasions, i have tightened tails in CUs as tight as seemed reasonable without stripping threads. 10 minutes later, i can then get another half turn to a full turn on the terminals.

That is because the tails are stranded.

 

[Amp David]

Always give the tails a wiggle about whilst tightening, that will settle the strands just right

 

[colshaws]

Allways when changing a C.U. or henley block I always tighten screws then do any further testing or closing off of other work then as last thing before putting covers on tighten all screws again, I find larger cables seem to "settle" a bit and need that little bit extra.

 

[netblindpaul]

The last few posts about large stranded cables just enhance my point about the differences in bolted joints.
There are hard joints and soft joints and many in between.
"Generally" a solid core 1.0, 1.5, 2.5mm would be a relatively "hard" joint.
4.0, 6.0 and upwards will be progressively softer due to the deformation mechanisms related to the ductility and dimensions of the wire strands.
Hence my argument that no single torque value is acceptable.

 

[manda]

I was actually considering eventually getting the Wiha torque set in the future. Reading this thread though, I'm fast considering saving my money! Thanks all!