Telephone line surge protection help with MOV's

Discussion in 'The Projects Forum' started by keyfinder, Aug 16, 2008.

  1. keyfinder

    Thread Starter New Member

    Aug 16, 2008
    2
    0
    Hi. I am using this circuit for my telco line protection at my telco box. My question is that on the Tip side and the MOV to ground I am getting 3.8 v DC. Is that normal? I am using 130Vrms MOV's. Max Voltage across telco is 42.6V DC, Ring is 53.3V DC and Ring 81.3V AC Max voltages. I know I should be using 250Vrms MOV's but is seems that the 130Vrms should be ok. I did not check the voltage from Tip to ground before I installed this circuit.

    I was also thinking about insalling a 250Vrms GDT to the left of the the MOV's.

    Any suggestions ?


    FUSE
    TELCO >----o/\o------/\/\/\----------o------------> OUT TO EQUIPMENT
    |
    LINE MOV
    |---MOV--> TO GROUND
    MOV
    FUSE 20 OHMS 2W |
    >----o\/o------/\/\/\----------o------------>


    Also does anyone know of a circuit I can use for my RG6 cable box at the main ground point ?

    Thanks
     
  2. keyfinder

    Thread Starter New Member

    Aug 16, 2008
    2
    0
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