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Discussion in 'Hobby Electronics' started by Matt H, Oct 10, 2005.

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  1. Matt H

    Matt H Guest

    hi all,
    recently we renovated our kitchen and when the electrician went to
    remove the stove it had 4 wires i guess the colours were red, black and
    green (i think) however there was another wire connected to it but i cant
    remember what colour it was any ideas on what colour if so why the extra
    wire??? any comments appreciated

    Matt
     
  2. Wing Wong

    Wing Wong Guest

    Does the stove use a 3 phase power supply, thats usually what 4 wires
    mean.
     
  3. Ken Taylor

    Ken Taylor Guest

    Did the stove have power points on it? May have been a second supply for
    that. Sparky could tell you when he re-wires the new one.....

    Ken
     
  4. Matt H

    Matt H Guest

    Well it wasnt 3 phase wiring, all i saw him do was move the stove out and
    disconnected it and i saw the 4 wires i know our hot water service has 4
    wires connect to that as well

    matt
     
  5. jj

    jj Guest

    On ordinary domestic stoves, its usual to have provision for a second
    phase (assuming that the house HAS a second phase available) to lessen
    the amp load per phase. It seemed to be more common prior to the
    1980's to have 2 phase mains to homes. (and I think it was mandatory
    if you had more than a certain number of power points in QLD)

    In single phase premises - these 2 actives are simply joined together
    in the stove's terminal box, and run from the one 240v supply, just
    like any other appliance.

    Note that the elements will be the normal 240v, not 415v. typically 2
    of the 4 hotplates and the grill will be on one Active and the other 2
    and the oven will be on the other Active. (No elements are connected
    directly ACROSS the 2 phases)

    In some stoves, if there isnt the second phase connected, there may be
    limits to how many of the stoves elements you are allowed to have on
    at once (to keep the maximum current down)
     
  6. Runtime

    Runtime Guest

    JJ is right Ranges used 2 phase power. It was not that it required 415
    volt. But the oven and elements (hotplates/griller) each were about 15
    amp. Given a house had 2 power and lighting that a lot of current. In
    older homes power use 7/.029 wiring (bare earth) and not 2.5mm. Now it
    would be on a 15 or 20 amp circuit. Buy the way the old one will work
    on single phase with heaver wiring.
     
  7. Matt H

    Matt H Guest

    Thanks for the replys now i understand why it is so shame theres no
    homepages explaining what u guys have all said shame there isnt a homepage
    explaining that in plain english :)
     
  8. What is the difference between 7.029 and 2.5mm earth ?? (Apart from being
    covered).
     
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