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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 Zoomup over 5 years ago

Chris Pearson:

Zoomup:

I double over single solid conductor ends, but leave stranded conductors untwisted and then let the clamp terminal grip the strands evenly.

I am not at all sure about doubling over solid conductors (or twisting them together) but I do agree that it helps to prevent the conductor slipping beside the screw in poor quality accessories.

As for fine stranded conductors, on the basis of the advice in here, I bootlace them (or use other crimped connector).

Hello Chris. I double over single solid copper wires at terminals as any twisting action after installation can loosen a single wire due to the high torque forces involved. This is the case with clamp terminals and screw terminals. It increases the terminal conductor surface area.

Where two 2.5mm2 copper wires enter a terminal, say at a socket on a ring final circuit, I just leave the copper wire ends single and parallel. The screw holds very well in that situation as rotation of the wire is not so likely. I gently twist the 1.5mm2 C.P.C.s together.

I do NOT twist together 2.5mm2 solid conductors.

I may gently twist together 1.0 or 1.5mm2 C.P.C.s. It makes for a reliable connection and reduces the risk of one C.P.C. of two not being reliably gripped in a terminal. And as we know C.P.C.s are important.

Fine stranded wire should be treated carefully as you say, and normally have a ferrule installed.

Z.
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0 Zoomup over 5 years ago

Chris Pearson:

Zoomup:

I double over single solid conductor ends, but leave stranded conductors untwisted and then let the clamp terminal grip the strands evenly.

I am not at all sure about doubling over solid conductors (or twisting them together) but I do agree that it helps to prevent the conductor slipping beside the screw in poor quality accessories.

As for fine stranded conductors, on the basis of the advice in here, I bootlace them (or use other crimped connector).

Hello Chris. I double over single solid copper wires at terminals as any twisting action after installation can loosen a single wire due to the high torque forces involved. This is the case with clamp terminals and screw terminals. It increases the terminal conductor surface area.

Where two 2.5mm2 copper wires enter a terminal, say at a socket on a ring final circuit, I just leave the copper wire ends single and parallel. The screw holds very well in that situation as rotation of the wire is not so likely. I gently twist the 1.5mm2 C.P.C.s together.

I do NOT twist together 2.5mm2 solid conductors.

I may gently twist together 1.0 or 1.5mm2 C.P.C.s. It makes for a reliable connection and reduces the risk of one C.P.C. of two not being reliably gripped in a terminal. And as we know C.P.C.s are important.

Fine stranded wire should be treated carefully as you say, and normally have a ferrule installed.

Z.
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Torque settings

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