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steel door contact?

Discussion in 'Security Alarms' started by Gus, Aug 16, 2004.

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  1. Gus

    Gus Guest

    What determins the diameter of the magnet and contact needed in a
    steel door?
    I see several diameters


  2. petem

    petem Guest

    i allways use 7/8 inch contact on metal door..
    i never have any probleme with this...on the false alarm side...
    but mecanicaly its another have to be very carefull to not go too
    large or the magnet or contact will have a tendency to pop out of there way i fixed the trouble was to used a sligly smaller hole saw to
    drilled the hole..or used a multibit...but those are not cheap....and when
    you touch ciment with it ,you dont like it.....;-)
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