Neutral

Discussion in 'Electrical Forum discussion & Blog' started by ShockHazard, Dec 11, 2012.

  1. ShockHazard

    ShockHazard New Member

    Messages:
    50
    Location:
    North East Pennsylvania
    Installed a potters kiln today, 10.5kw, but only split phased (220v).

    I have a red and black hot, green ground, but being the device doesn't receive a neutral, should I disregard it or match it to the ground?

    What is the general rule of neutral coming in contract with ground?

    Why would a 10.5kw device be single phase in the first place?
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    The pro electricians will answer up. I am pretty sure the neutral should ONLY ever contact ground at the main panel.

    Most residences, and small commercial properties, are just wired for single phase 220. Plenty of residences that have for example a 60 amp electric heat air handler, on single phase.
  3. Glennsparky

    Glennsparky New Member

    Messages:
    22
    Location:
    Oviedo, FL near Orlando
    Jimbo is correct. Put a small wire nut on the neutral and don't let it come in contact with anything.
  4. jwelectric

    jwelectric Electrical Contractor/Instructor

    Messages:
    2,529
    Location:
    North Carolina
    This is very correct my friend
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,279
    Location:
    Cave Creek, Arizona
    220/240 v. power is "single phase", not "split phased". If the building only has single phase, then that is how the kiln must be wired. In order to be "three phase" the building would have to be served with three phase power. Then the unit would either need two elements with the "center" leg carrying about 1.75 times the amperage of either element, or multiples of three elements wired so all legs carried the same amperage. Without a 120 v. function the neutral is not needed and should be capped and disregarded.
    Last edited: Dec 13, 2012
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,817
    Location:
    New England
    IF the unit has both 120 and 240 functions, it will need the neutral, otherwise, no. Sometimes, like in a stove, there will be a 120vac light, maybe some controls, and possibly a receptacle, so it will need a neutral but the heating elements would be fed from 240vac. No idea on your new kiln whether it needs 120vac and therefore a neutral - it should be clearly spelled out in their installation instructions or be obvious at the junction box where you connect things.
  7. ShockHazard

    ShockHazard New Member

    Messages:
    50
    Location:
    North East Pennsylvania
    It does have a low voltage electronic control panel, but I don't know it's input voltage.

    ___

    So, neutral was capped and kiln works fine.
  8. ShockHazard

    ShockHazard New Member

    Messages:
    50
    Location:
    North East Pennsylvania
    Maybe I'm using the phrase wrong.

    http://en.wikipedia.org/wiki/Split-phase_electric_power
  9. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    I ( amateur electrical knowledge) have not seen the term split phase used like that. The sparkies will tell us if the industry and/or the electrical code uses that term. Anyway, we are talking about the same thing, whether we call it split or single
  10. ActionDave

    ActionDave Electrician

    Messages:
    345
    Location:
    Colorado
    With a few rare exceptions all power in North America is either single phase or three phase.

    True Split phase power was part of era when electrical power systems were first designed.
  11. big2bird

    big2bird IBEW Electrician

    Messages:
    141
    Location:
    Anaheim, Ca.
    The only time you will hear split phase is regarding small motors with windings/capacitors that actually split the phase.
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