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Torque settings

Hi all,

Obviously, where available we use manufacturer's torque settings for connections. But where do they get them from?

I ask this not least because it's not always easy to obtain, at least in a timely fashion, but also because I appear to have conflicting instructions on some OEM'd equipment (comparing the original manufacturer with the wrapped supplier) or notably different settings when using the same lug onto a very similar terminal bar from a different supplier. It would also be helpful to be able to sense-check the answers for misplaced decimal points.

Jam

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0 Jam over 5 years ago

Thanks for all the thoughts so far everyone.

Probably by calculation, but could be experimental.

Clearly a great deal depends upon the materials. Also, pinching a copper conductor is rather different from, for example, taking the varying load of a con-rod's big end, but there are some guidelines here.

Thanks for the link Chris, one to keep to hand. This is the kind of thing I was looking for and it'd be great to have a similar table for copper / tinned copper / alu / tinned alu etc.

I've found the Copper Development Association's guidance document which has typical torque settings for various sizes but manufacturer's recommendations don't always fall particularly close... for an M10 bolted termination I can be quoted anything from 13Nm at the device at one end of a cable to 60Nm on the device at the other! Maybe it really is that it's calculated in detail and there's a wide range of sensible answers without detailed analysis, which I'll not have the data for.

Jam
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0 Jam over 5 years ago

Thanks for all the thoughts so far everyone.

Probably by calculation, but could be experimental.

Clearly a great deal depends upon the materials. Also, pinching a copper conductor is rather different from, for example, taking the varying load of a con-rod's big end, but there are some guidelines here.

Thanks for the link Chris, one to keep to hand. This is the kind of thing I was looking for and it'd be great to have a similar table for copper / tinned copper / alu / tinned alu etc.

I've found the Copper Development Association's guidance document which has typical torque settings for various sizes but manufacturer's recommendations don't always fall particularly close... for an M10 bolted termination I can be quoted anything from 13Nm at the device at one end of a cable to 60Nm on the device at the other! Maybe it really is that it's calculated in detail and there's a wide range of sensible answers without detailed analysis, which I'll not have the data for.

Jam
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Torque settings

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