Distribution of Power Lines from MAINS SWITCH

Discussion in 'The Projects Forum' started by SabapathyPalingam, Dec 18, 2010.

How the junction points are wired

Poll closed Jun 16, 2011.
  1. terminal - common

  2. terminal - multiple

Multiple votes are allowed.
  1. SabapathyPalingam

    Thread Starter New Member

    Dec 17, 2010
    I need help in the following

    I have 5 Nos. Induction Motors.

    Each 2 KW ratings.

    These motors are wired to Power contactor - 440 V - Normally Open Type
    These contactors has Auxillary Contactor - 220V for keeping power contactor Closed
    To actuate these contactors there are 5 Independent Switches
    Say Switches - A ; B ; C ; D 'And E

    The wires From the power contactors from each contactor - 3 Phase and a Nuetral
    are terminated at the distribution juction Box

    One set of wires - for each contactors - that is having 3 phase wires and a nuetral wire - and totally 5 sets

    My question is :-

    Are these 5 sets of wires connected to MAINS SWITCH Terminal Points at common terminal ?
    Multiple terminal ?

    That is
    Do the MAINS SWITCH has common terminal or Multiple Terminal ?

    In case of multiple Terminal - what is name of Switch ?
    How do I Specify in My Bill of Material ?

    Hope I get clarifications

    Thanks and Regards
  2. mik3

    Senior Member

    Feb 4, 2008
    Each motor shall have a circuit breaker (MCB) in the distribution panel. Then these circuit breakers are connected to common bus bars (phase, neutral and ground bus bars). The bus bars are isolated with a main isolation switch. This is a common connection. In higher power applications more sets of bus bars may be used.
    SabapathyPalingam likes this.
  3. roadey_carl

    Senior Member

    Jun 5, 2009
    I don't really understand what you meen. Are you asking what type of main switch it is? if the switch isolates all 3phases and neutral then its classed as a " Tripple pole & Neutral isolator " or " TP&N Isolator "
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    This is probably a job best performed by a professional electrician.
  5. SabapathyPalingam

    Thread Starter New Member

    Dec 17, 2010
    Dear MIK 3

    Thanks for your reply

    I tried to construct as per your suggestion and
    I have attached the drawing in the word format.

    I request you go through and I need your concurrance
    whether this drawing ia OK or not

    Thanks and Regards
  6. SabapathyPalingam

    Thread Starter New Member

    Dec 17, 2010
    Dear MIK3

    Your comments please on the drawing attached

    Your e-mail ID please If you do not mind
    Mine:- <SNIP>

    Thanks and Regards
    Last edited by a moderator: Dec 20, 2010
  7. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    try redrawing it with your concept of 'common' terminals and we'll see what you get. Who's electrical code are you trying to satisfy?
  8. SabapathyPalingam

    Thread Starter New Member

    Dec 17, 2010
    Dear GetDeviceInfo,

    I am not trying to satisfy any one.

    I am from the Old school - I am at 57 years old
    I am aware of the common terminal mains switch,
    However , this tend to become clumsy,
    and bulky to construct and always not easily available in the market- It has to be constructed by ourselves.
    I wanted a better solution
    Mr. MIK3 suggestion seems to be a better Idea.
    I wanted whether I got him right?
    So I constructed a circuit Diagram and wanted him to comment on it .
    I am not really into satisfying any one please - please
    I am sorry if I made that sense.
    I really wanted a better solution - may be better kind of multiple
    terminal switch which would be easy to use and install.
    However I find the Bus-bar connection which MIK3 suggested
    a better alternative and I did make the circuit accordingly
    and I wanted concurrance from him.

    Hope I did not get into any unwanted controversy

    Thanks and Regards
  9. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
    Might be helpful (as always) when discussing what's not available in your market to post where you're from in your profile.
  10. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    I'm sure you'll need to satisfy some body, code wise. I asked that you post your drawing differently to clear up some confusion as to your terminology.

    Typically, your supply from the isolation switch would feed a common terminal from which individual sources would be drawn to each load. Your drawing indicates seperate terminals, becoming cluttered.