Neutral Wire Size: Difference between revisions
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Neutral of a 240V 1-phase service feed can be sized as a smaller wire. The size must handle the current imbalance between the 2 legs. | |||
https://sparkypedia.electricianu.com/are-we-allowed-to-reduce-the-size-of-neutral-conductors/#:~:text=Because%20the%20neutral%20conductor%20functions,neutral%20conductor%20for%20a%20feeder. | https://sparkypedia.electricianu.com/are-we-allowed-to-reduce-the-size-of-neutral-conductors/#:~:text=Because%20the%20neutral%20conductor%20functions,neutral%20conductor%20for%20a%20feeder. | ||
Is this the correct understanding: | |||
#Center tapped transformer has opposite phases on each side | |||
#Current cancels itselff out when each side is loaded equally | |||
#If each side is not loaded equally, then the center wire transfers only the unbalanced current - the balanced part of current cancels itself out. | |||
Note that 120/240V comes from a single phase winding. To get 120, armature of generator is tapped at the center. A 3 phase source has 3 armatures. This is just how the geometry works out. | |||
Do power lines carry 1 phase or 3 phase? | |||
=Links= | |||
*[[How Power Grids Work]] | |||
[[Category:Electronics]] | |||
Latest revision as of 01:50, 16 February 2024
Neutral of a 240V 1-phase service feed can be sized as a smaller wire. The size must handle the current imbalance between the 2 legs.
Is this the correct understanding:
- Center tapped transformer has opposite phases on each side
- Current cancels itselff out when each side is loaded equally
- If each side is not loaded equally, then the center wire transfers only the unbalanced current - the balanced part of current cancels itself out.
Note that 120/240V comes from a single phase winding. To get 120, armature of generator is tapped at the center. A 3 phase source has 3 armatures. This is just how the geometry works out.
Do power lines carry 1 phase or 3 phase?