Difference between partial contact and arcing

Discussion in 'General Electronics Chat' started by Msinks, Jul 28, 2012.

  1. Msinks

    Thread Starter New Member

    Mar 3, 2012
    22
    0
    I was going through the Factories (Electricity) Regulations of Zambia. Regulation number 8 has two parts;
    (1) Every switch intended to be used for breaking a circuit and every circuit breaker and each pole of a double-pole or multi-pole switches or circuit-breakers shall be so constructed that it cannot with proper care be left in partial contact.
    (2) Every switch intended to be used for breaking a circuit and every circuit breaker shall so be so constructed that an arc cannot be accidentally maintained.

    So what is partial contact and how is it different form arcing? Can we call two separate contacts with different potentials having an arc maintained between them in partial contact? Why is a single pole switch not mentioned in (1)?
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    This was neither feedback nor a suggestion, so I have moved it to a more appropriate forum.
     
    Msinks likes this.
  3. Lundwall_Paul

    Member

    Oct 18, 2011
    220
    19
    I understand what they are driving at just hope I can shed some light on it.

    (1) Every switch intended to be used for breaking a circuit and every circuit breaker and each pole of a double-pole or multi-pole switches or circuit-breakers shall be so constructed that it cannot with proper care be left in partial contact.
    partial connections can become resistive and eventually burn up as it can't carry the same current as a fully mated connection.

    (2) Every switch intended to be used for breaking a circuit and every circuit breaker shall so be so constructed that an arc cannot be accidentally maintained.
    As far as arcing they do not want electricity jumping across the open contacts this can be controlled by contact spacing and/or insulating between contacts.
     
    Msinks likes this.
  4. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348

    I'm not from Zambia so don't take this on any authority but the way I read your statements, the partial contact is when, on a multi pole device, one or more poles fail to open when the others do. The maintained arc is pretty well self explanatory.
     
    Msinks likes this.
Loading...