Distance Between Phase and Neutral

There is no minimum angular separation. At some piont each potential phase crosses neutral with respect to 0V. P.S. This should be in your textbook.

You want to say that there is no problem , if overhead distribution lines as close to each other? Then why did standards say that minimum insulation thickness for cores in a multicore cable?

Dear guest,

The spacing depends mainly on the voltage.

By the way, did you say "Harward" ? Where is it ?

Please read the suggested posting guidelines listed here:.

http://cr4.globalspec.com/faq#faq14a

In addition to the policy against homework cheating, no one can answer your question as posted because you have not specified voltage, frequency, conductor geometry, and type of insulator.

Dear all gurus,power users,........,browsers,

1 phase,120 Volt AC, 60 Hz, bare copper conductor to be installed in air, ambient temperature 45 deg celsius. what is the minumum distance between line and neutral?

This ought to be covered in the NEC (U.S. National Electrical Code).

I was unable to find a university named Harward, but its home country no doubt has a set of standards not unlike the NEC standards used in the US. Other codes and standards can take precedent, however, depending upon the installation. You can answer your own question with a little research.

Please, somebody respond with any equation,example etc to understand him. Forget about his university. ( Even I would like to know about this)

Post #7 HAS a link that provides several good guidelines and suggested NUMBERS for the OP to use. The spacing recommendation is in the first paragraph and it is a simple calculation to scale it to 120VAC as also suggested in the first paragraph.

GA.. #7 i mean.

Refer codes and standards like BS/NEC/IEC/VDE etc. The value will depend on voltage and whether inside an enclosure or in open air,mounted on insulator,in vacuum,in SF6 etc

For cables the insulation PVC/XLPE etc should be considered.