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    Wrenwell's Avatar
    Wrenwell Posts: 7, Reputation: 1
    New Member

    Dec 18, 2005, 11:23 AM
    Blown bulbs when switching on
    Hi: Having an odd problem w/ light bulbs blowing across 3 circuits with no dimming or brightening. When switch is flipped on, bulbs immediately fail, one actually made a small "pop" sound--6 in all in one week. Also had reverb on computer speakers.

    Basic Info: 80 year old house; all new wiring except for livng room run on knob and tube which is tied into one of the new circuits. Power company check states no loose neutral on their side. Have lived in house 30 years w/ no problems until last week. Have been told a loose neutral would cause brightening and dimming, and since I don't have those symptoms that I don't have one. Knob & tube in unusually good condition.

    Looking at other posts I discover info about shared neutrals and flourscent lights--I not only have fluorescent fixtures, I use flourscent bulbs in regular lamps.

    Complications: Am awaiting roof repair due to termite damage plus a leak at an exterior wall where the knob and tube feeds an exterior light on sun porch.

    Question: If the knob & tube got wet could it affect the rest of the circuits? Could the termites have damaged the newer wiring? Any other comments would be appreciated.

    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member

    Dec 18, 2005, 02:57 PM
    Incandescent lights often go out with a flash when turned on at the end of their life. Is that what these are, or is it fluoresents or the compact fluoresents that screw in a conventional socket? I am mainly thinking of a bad batch of bulbs. I once fixed a flickering light problem by replacing the GE energy saving light bulbs with cheap no names.

    Most wiring faults would cause low voltage, and blowing light bulbs would take high voltage. Squirrels and termites might damage the insulation, maybe burn the house down, but not blow the light bulbs. Does the computer with the speaker problem have a surge protector?

    Did the power company check the incoming voltage?
    Wrenwell's Avatar
    Wrenwell Posts: 7, Reputation: 1
    New Member

    Dec 19, 2005, 10:14 AM
    Bulbs Blowing
    Thanks, Labman, for reply: Bad batch is a good possibility. Half of the lighting I use on a regular basis is incandescent (60&100) and all those blew. But, the bulbs had been installed at various times over several months--so all 6 of varying ages decided to blow in the same week. No problem w/ fluorescent fixtures/compact bulbs. I've never noticed any flashing on bulb death, occasional pop sound--it's instantaneous to flipping switch however, so I could miss any flashing.

    Computer & speakers are connected to surge strip in a room on its own circuit. Reverb loud enough for me to shut them off, but its gone now. Power company did not check incoming voltage.

    Hopefully all of this is a coincidence coupled with a series of events that got "blown" out of proportion.

    Thanks again, Wrenwell.
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member

    Dec 19, 2005, 12:34 PM
    Keep us posted. Not sure this is something to let go. Keep an eye on the thread. Turks may have a better answer than mine the next time he drops in.

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