Cables

Verbiage.

There is a difference between 'twisted pair' and 2 core, but one pair and two core would be the same if wire size insulation colour etc are the same. Colour is V important as electrons prefer the bright colours.
Del

Hi,

I use one pair for signal cable of the instrument, I use two pair cable for feedback of high and low switches. the would be the differences.

Regard's

One pair often has an overall screen and the conductors are twisted around each other within the screen so as to minimise the opportunities for external electromagnetic interference. It is typically used in industry to convey 4-20mA analog signals around the place. In multi-pair, the pairs will be numbered and the individual core insulation colours may repeat from one pair to the next.

Two core may not have the overall screen, and is probably more suited to digital signals, power transfer, wiring motor starters to emergency stop buttons and the like. Multi-core may have the cores either individually numbered or sequenced around the spectrumso that each conductor's insulation colour is unique within the cable.

The terms 'pair', 'triad' and 'quad' are used in the context of instrument cable, while the term 'core' or 'conductor' is used in the context of power or control cable. See this thread (especially the comment # 6) for more detail about power, control and instrument cables : http://cr4.globalspec.com/thread/51680/Is-This-a-Power-Cable

- MS