240 v single phase pump motor switching

Discussion in 'General Electronics Chat' started by GKP, Sep 12, 2014.

  1. GKP

    Thread Starter New Member

    Aug 15, 2014
    12
    0
    Just a general question. Have a single phase pump motor being switched on off by breaking just one leg, but most pumps and compressor switches that I have dealt with have contact breakers to switch both legs. Is there a reason both legs should be opened?
     
  2. #12

    Expert

    Nov 30, 2010
    16,310
    6,817
    In the U.S. the 240 volts is center tapped to Earth ground. That makes both wires hot compared to a person standing on the ground, so both of them are dangerous.
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,553
    2,375
    As per #12, in N.A. both 240 conductors should be fused and switched, if the 1ph motor is 120v then you can switch the live conductor only.
    In UK and most of Europe the 240v supply is 240v and neutral, so only the 240v live conductor can be switched.
    You do not show your C.of.O.
    Max.
     
    Last edited: Sep 12, 2014
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