48V DC Lighting Help Needed

Discussion in 'General Electronics Chat' started by SCTony2, Mar 11, 2012.

  1. SCTony2

    Thread Starter New Member

    Aug 13, 2011
    3
    0
    Hello, I am currently installing a back-up lighting system (48VDC, ~7A steady state) for a local power company substation, based on their prints. They have similar systems in other substations and have had problems with the switches burning out quickly. It is a simple system, (5) 48VDC 60Watt incandescent bulbs controlled by (2) 3-way switches. I am finding that this is a tough load for a switch to carry and I am having a hard time finding a capable toggle. I understand that a lamp load appears as a near-short on powerup. I have located an industrial 30amp (277VAC) 3-way switch with "large silver cadmium-oxide contacts" and that may be sufficient, but I am not certain. Any recommendations as to switches (SP/DT or DP/DT), inrush current limiters, or other ideas would be much appreciated. Thanks all you smart guys! :)
     
  2. #12

    Expert

    Nov 30, 2010
    16,343
    6,828
    Here's a start but I forgot to put a discharge path on the gate.
    Now I'm distracted with another chore.
    BRB
     
    Last edited: Mar 11, 2012
  3. #12

    Expert

    Nov 30, 2010
    16,343
    6,828
    This should work better.
     
  4. SCTony2

    Thread Starter New Member

    Aug 13, 2011
    3
    0
    Wow, Thanks so much! :)
     
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